Liste der Fachpublikationen

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Gutzeit, Enrico; Kloß, Enrico; Schröder, Andreas

3D-Registrierung zum Soll-Ist-Vergleich auf Basis unterschiedlicher Geometriedateiformate

2014

Paul, Lothar (Ed.) et al.: 3D-NordOst 2014 : 17. Anwendungsbezogener Workshop zur Erfassung, Modellierung, Verarbeitung und Auswertung von 3D-Daten. Berlin: GFaI, 2014, pp. 43-52

Anwendungsbezogener Workshop zur Erfassung, Modellierung, Verarbeitung und Auswertung von 3D-Daten (3D-NordOst) <17, 2014, Berlin, Germany>

Der Soll-Ist-Vergleich ist eine notwendige Maßnahme zur Sicherung der Qualität gefertigter Bauteile. Zur Automatisierung des Soll-Ist-Vergleiches sind eine einheitliche Repräsentation der Geometrie und eine robuste 3D-Registrierung notwendig. In diesem Beitrag wird eine Methode zur 3D-Registrierung auf Basis verschiedener Geometriedateiformate großer technischer Objekte vorgestellt. Ausgehend von einem Laserscan (Ist-Modell) und einem CAD-Format (Soll-Modell) wird eine einheitliche Dreiecksrepräsentation generiert. Anhand der einheitlichen Repräsentation, dem weitverbreiteten STL-Format, wird eine dreistufige 3D-Registrierung vorgenommen. In der ersten Stufe werden aus den Dreiecken geeignete Punkte generiert. In der zweiten Stufe werden die Punktwolken anhand von lokalen Merkmalen grob vorregistriert und in der letzten und dritten Stufe diese genau aufeinander registriert. Durch die Anbindung der Funktionalität an eine CAD/CAM Software, wie bspw. DCAM, ergeben sich eine einfach handhabbare 3D-Registrierung und eine Basis für einen anschließenden Soll-Ist-Vergleich.

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Flach, Guntram; Frenzel, Chathy

9. Rostocker eGovernment-Forum 2014 - Sicheres eGovernment: Herausforderung und Notwendigkeit

2014

Rostocker eGovernment-Forum <9, 2014, Rostock-Warnemünde, Germany>

Das 9. Rostocker eGovernment-Forum verfolgt das Ziel, anhand von Fachvorträgen und Praxisbeispielen neuartige Konzepte und Lösungen aus den Themenbereichen IT-Sicherheit, Open Government, mobile Anwendungen, Cloud Computing und Optimierung von Verwaltungsprozessen vorzustellen und Gelegenheit zu einem Gedanken- und Erfahrungsaustausch zu schaffen. Der vorliegende Tagungsband dokumentiert mit seinen Kurzfassungen ein anspruchsvolles Vortragsprogramm.

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Wesarg, Stefan; Jung, Florian; Steger, Sebastian

Abbildung anatomischen Wissens: Ein Kopf-/Hals-Atlas multipler gekoppelter Strukturen

2014

Endoskopie heute, Vol.27 (2014), 3, pp. 141-145

Medizinische Bilddaten enthalten anatomische Informationen. Die Extraktion derselben durch manuelles Markieren ist unter Berücksichtigung der Datenmenge vor allem bei radiologischen 3D-Bilddaten nicht mehr vernünftig durchführbar. Hier helfen computerbasierte, automatische Verfahren. Nicht alle anatomischen Regionen heben sich durch deutliche Kontrastunterschiede von der Umgebung ab. Dennoch sind Radiologen in der Lage, auch solche Bereiche in den Bilddaten zuzuordnen. Für automatisch ablaufende Algorithmen besteht dabei die Herausforderung, das anatomische Wissen eines klinischen Experten in einer für den Computer verständlichen Form zu repräsentieren. Für den Kopf-/Hals-Bereich haben wir ein solches Modell entwickelt, das anatomische Strukturen enthält, die miteinander gekoppelt sind. Das Modell repräsentiert diese hinsichtlich ihrer Form und Größe als auch ihrer relativen Lage zueinander. Dabei wird zwischen aktiven und passiven Strukturen unterschieden. Erstere repräsentieren deutlich von der Umgebung abgrenzbare Bildbereiche, letztere Regionen, die nur aufgrund ihrer relativen Lage zu anderen Organen identifizierbar sind. Der neue Modellierungsansatz ist dabei einerseits flexibler als klassische atlasbasierte Segmentierungsverfahren. Andererseits sind das neue Verfahren und das dafür entwickelte Framework generisch und können mit geringen Adaptionen auch für Fragestellungen jenseits des Kopf-/Hals-Bereichs eingesetzt werden.

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Abschlussbericht - MEMO Basis, Design und Shared Services

2014

Zielstellung und Schwerpunkt des Teilprojektes "MEMO Basis, Design und Shared Services" war die Entwicklung von Konzepten und die prototypische Umsetzung von Shared Services. Diese realisieren Basisdienste für höher aggregierte MEMO-Dienste Zu den Shared Services zählen Semantik-Dienste, Empfehlungsdienste, Aggregationsdienste und Profiling-Dienste. Aufbauend auf diesen Shared Services erstellte das IGD intelligente Supportdienste für die Kommunikation mit Experten, Dienste für die semantische Suche und proaktive Bereitstellung von Informationen sowie Game-Dienste zur Vermittlung von Handlungswissen. Das Fraunhofer IGD leistete im Teilprojekt außerdem Beiträge zur Entwicklung und Umsetzung der konzeptionellen Architektur des MEMO Referenz Portals, in welchem die verschiedenen Einzeldienste nach dem Cloud-Prinzip für unterschiedliche Anwendungen verfügbar gemacht wurden. Das Fraunhofer IGD war außerdem für die Koordination der Entwicklung der Use Case Beschreibungen für das Gesamtsystem und die einzelnen zu entwickelnden Dienste verantwortlich.

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Nazemi, Kawa; Fellner, Dieter W. (Betreuer); Wrobel, Stefan (Betreuer)

Adaptive Semantics Visualization

2014

Darmstadt, TU, Diss., 2014

Human access to the increasing amount of information and data plays an essential role for the professional level and also for everyday life. While information visualization has developed new and remarkable ways for visualizing data and enabling the exploration process, adaptive systems focus on users' behavior to tailor information for supporting the information acquisition process. Recent research on adaptive visualization shows promising ways of synthesizing these two complementary approaches and make use of the surpluses of both disciplines. The emerged methods and systems aim to increase the performance, acceptance, and user experience of graphical data representations for a broad range of users. Although the evaluation results of the recently proposed systems are promising, some important aspects of information visualization are not considered in the adaptation process. The visual adaptation is commonly limited to change either visual parameters or replace visualizations entirely. Further, no existing approach adapts the visualization based on data and user characteristics. Other limitations of existing approaches include the fact that the visualizations require training by experts in the field. In this thesis, we introduce a novel model for adaptive visualization. In contrast to existing approaches, we have focused our investigation on the potentials of information visualization for adaptation. Our reference model for visual adaptation not only considers the entire transformation, from data to visual representation, but also enhances it to meet the requirements for visual adaptation. Our model adapts different visual layers that were identified based on various models and studies on human visual perception and information processing. In its adaptation process, our conceptual model considers the impact of both data and user on visualization adaptation. We investigate different approaches and models and their effects on system adaptation to gather implicit information about users and their behavior. These are than transformed and applied to affect the visual representation and model human interaction behavior with visualizations and data to achieve a more appropriate visual adaptation. Our enhanced user model further makes use of the semantic hierarchy to enable a domain-independent adaptation. To face the problem of a system that requires to be trained by experts, we introduce the canonical user model that models the average usage behavior with the visualization environment. Our approach learns from the behavior of the average user to adapt the different visual layers and transformation steps. This approach is further enhanced with similarity and deviation analysis for individual users to determine similar behavior on an individual level and identify differing behavior from the canonical model. Users with similar behavior get similar visualization and data recommendations, while behavioral anomalies lead to a lower level of adaptation. Our model includes a set of various visual layouts that can be used to compose a multi-visualization interface, a sort of "'visualization cockpit"'. This model facilitates various visual layouts to provide different perspectives and enhance the ability to solve difficult and exploratory search challenges. Data from different data-sources can be visualized and compared in a visual manner. These different visual perspectives on data can be chosen by users or can be automatically selected by the system. This thesis further introduces the implementation of our model that includes additional approaches for an efficient adaptation of visualizations as proof of feasibility. We further conduct a comprehensive user study that aims to prove the benefits of our model and underscore limitations for future work. The user study with overall 53 participants focuses with its four conditions on our enhanced reference model to evaluate the adaptation effects of the different visual layers.

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Adaptive Visualization of Linked-Data

2014

Bebis, George (Ed.) et al.: Advances in Visual Computing. 10th International Symposium, ISVC 2014 : Proceedings, Part II. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8888), pp. 872-883

International Symposium on Visual Computing (ISVC) <10, 2014, Las Vegas, NV, USA>

Adaptive visualizations reduces the required cognitive effort to comprehend interactive visual pictures and amplify cognition. Although the research on adaptive visualizations grew in the last years, the existing approaches do not consider the transformation pipeline from data to visual representation for a more efficient and effective adaptation. Further todays systems commonly require an initial training by experts from the field and are limited to adaptation based either on user behavior or on data characteristics. A combination of both is not proposed to our knowledge. This paper introduces an enhanced instantiation of our previously proposed model that combines both: involving different influencing factors for and adapting various levels of visual peculiarities, on content, visual layout, visual presentation, and visual interface. Based on data type and users' behavior, our system adapts a set of applicable visualization types. Moreover, retinal variables of each visualization type are adapted to meet individual or canonical requirements on both, data types and users' behavior. Our system does not require an initial expert modeling.

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Adaptive Visualization of Social Media Data for Policy Modeling

2014

Bebis, George (Ed.) et al.: Advances in Visual Computing. 10th International Symposium, ISVC 2014 : Proceedings, Part I. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8887), pp. 333-344

International Symposium on Visual Computing (ISVC) <10, 2014, Las Vegas, NV, USA>

The visual analysis of social media data emerged a huge number of interactive visual representations that use different characteristics of the data to enable the process of information acquisition. The social data are used in the domain of policy modeling to gather information about citizens' demands, opinions, and requirements and help to decide about political policies. Although existing systems already provide a huge number of visual analysis tools, the search and exploration paradigm is not really clear. Furthermore, the systems commonly do not provide any kind of human centered adaptation for the different stakeholders involved in the policy making process. In this paper, we introduce a novel approach that investigates the exploration and search paradigm from two different perspectives and enables a visual adaptation to support the exploration and analysis process.

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Peter, Christian; Prophet, Heinrich; Haescher, Marian

AktiDia - Aktivitätsmessung in der Dialyse

2014

Bieber, Gerald (Ed.) et al.: WOAR 2014 : Proceedings of the Workshop on Sensor-based Activity Recognition. Stuttgart: Fraunhofer Verlag, 2014, pp. 80-96

Workshop on Sensor-Based Activity Recognition (WOAR) <1, 2014, Rostock, Germany>

Im Rahmen der klinischen Studie AktiDia wurden Dialyse-Patienten mit verschiedenen Sensoren zur Erfassung der körperlichen Aktivität ausgestattet. Die Studie verfolgte drei Fragestellungen: zum einen wurde untersucht, wie verschiedene Aktivitätssensoren von Patienten angenommen werden und welche Eigenschaften ein Sensor für die Überwachung körperlicher Aktivität von Dialysepatienten haben sollte, um eine möglichst hohe Akzeptanz zu erlangen. Zweitens wurde das Aktivitätsverhalten von Dialysepatienten über einen Zeitraum von einer Woche untersucht, wobei insbesondere charakteristische Merkmale der Aktivitäten an Dialysetagen und den Tagen zwischen den Behandlungen betrachtet wurden sowie entsprechende Korrelationen zum Nachtschlaf der Patienten. Drittens wurde untersucht, ob und wie sich das Tragen eines Aktivitätssensors auf das Aktivitätsverhalten von Dialysepatienten auswirkt.

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Große-Puppendahl, Tobias; Beck, Sebastian; Wilbers, Daniel; Zeiß, Steeven; Wilmsdorff, Julian von; Kuijper, Arjan

Ambient Gesture-Recognizing Surfaces with Visual Feedback

2014

Streitz, Norbert (Ed.) et al.: Distributed, Ambient, and Pervasive Interactions : DAPI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8530), pp. 97-108

International Conference on Distributed, Ambient and Pervasive Interactions (DAPI) <2, 2014, Heraklion, Crete, Greece>

In recent years, gesture-based interaction gained increasing interest in Ambient Intelligence. Especially the success of camera-based gesture recognition systems shows that a great variety of applications can benefit significantly from natural and intuitive interaction paradigms. Besides camera-based systems, proximity-sensing surfaces are especially suitable as an input modality for intelligent environments. They can be installed ubiquitously under any kind of non-conductive surface, such as a table. However, interaction barriers and the types of supported gestures are often not apparent to the user. In order to solve this problem, we investigate an approach which combines a semi-transparent capacitive proximity-sensing surface with an LED array. The LED array is used to indicate possible gestural movements and provide visual feedback on the current interaction status. A user study shows that our approach can enhance the user experience, especially for inexperienced users.

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Anatomical Discovery: Finding Organs in the Neighborhood of the Liver

2014

Romero, Laura M. Roa (Ed.): XIII Mediterranean Conference on Medical and Biological Engineering and Computing : MEDICON 2013. Berlin, Heidelberg, New York: Springer, 2014. (IFMBE Proceedings 41), pp. 348-351

The Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON) <13, 2013, Seville, Spain>

Image segmentation and registration algorithms are fundamental to assist medical doctors for better treatment of the patients. To this end accuracy in the results given by those algorithms is crucial. The surroundings of the organ to be segmented or registered can provide additional information that at the end improves the result. In this paper a novel algorithm to detect the organs that surround the liver is introduced. Even though our work is focused on the liver, the algorithm could be extended to other parts of the body. The algorithm has been tested in 24 clinical CT datasets. In addition to this, an example application is introduced for which the detection is a useful tool.

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Alm, Rebekka; Waltemath, Dagmar; Wolkenauer, Olaf; Henkel, Ron

Annotation-Based Feature Extraction from Sets of SBML Models

2014

Galhardas, Helena (Ed.) et al.: Data Integration in the Life Sciences : 10th International Conference. DILS 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Bioinformatics (LNBI) 8574), pp. 81-95

International Conference on Data Integration in the Life Sciences (DILS) <10, 2014, Lisbon, Portugal>

Model repositories such as BioModels Database provide computational models of biological systems for the scientific community. These models contain rich semantic annotations that link model entities to concepts in well-established bio-ontologies such as Gene Ontology. Consequently, thematically similar models are likely to share similar annotations. Based on this assumption, we argue that semantic annotations are a suitable tool to characterize sets of models. These characteristics can then help to classify models, to identify additional features for model retrieval tasks, or to enable the comparison of sets of models. In this paper, we present four methods for annotation-based feature extraction from model sets. All methods have been used with four different model sets in SBML format and taken from BioModels Database. To characterize each of these sets, we analyzed and extracted concepts from three frequently used ontologies for SBML models, namely Gene Ontology, ChEBI and SBO. We find that three of the four tested methods are suitable to determine characteristic features for model sets. The selected features vary depending on the underlying model set, and they are also specific to the chosen model set. We show that the identified features map on concepts that are higher up in the hierarchy of the ontologies than the concepts used for model annotations. Our analysis also reveals that the information content of concepts in ontologies and their usage for model annotation do not correlate.

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Braun, Andreas; Fellner, Dieter W. (Betreuer); Mühlhäuser, Max (Betreuer)

Application and Validation of Capacitive Proximity Sensing Systems in Smart Environments

2014

Darmstadt, TU, Diss., 2014

Smart environments feature a number of computing and sensing devices that support occupants in performing their tasks. In the last decades there has been a multitude of advances in miniaturizing sensors and computers, while greatly increasing their performance. As a result new devices are introduced into our daily lives that have a plethora of functions. Gathering information about the occupants is fundamental in adapting the smart environment according to preference and situation. There is a large number of different sensing devices available that can provide information about the user. They include cameras, accelerometers, GPS, acoustic systems, or capacitive sensors. The latter use the properties of an electric field to sense presence and properties of conductive objects within range. They are commonly employed in finger-controlled touch screens that are present in billions of devices. A less common variety is the capacitive proximity sensor. It can detect the presence of the human body over a distance, providing interesting applications in smart environments. Choosing the right sensor technology is an important decision in designing a smart environment application. Apart from looking at previous use cases, this process can be supported by providing more formal methods. In this work I present a benchmarking model that is designed to support this decision process for applications in smart environments. Previous benchmarks for pervasive systems have been adapted towards sensors systems and include metrics that are specific for smart environments. Based on distinct sensor characteristics, different ratings are used as weighting factors in calculating a benchmarking score. The method is verified using popularity matching in two scientific databases. Additionally, there are extensions to cope with central tendency bias and normalization with regards to average feature rating. Four relevant application areas are identified by applying this benchmark to applications in smart environments and capacitive proximity sensors. They are indoor localization, smart appliances, physiological sensing and gesture interaction. Any application area has a set of challenges regarding the required sensor technology, layout of the systems, and processing that can be tackled using various new or improved methods. I will present a collection of existing and novel methods that support processing data generated by capacitive proximity sensors. These are in the areas of sparsely distributed sensors, model-driven fitting methods, heterogeneous sensor systems, image-based processing and physiological signal processing. To evaluate the feasibility of these methods, several prototypes have been created and tested for performance and usability. Six of them are presented in detail. Based on these evaluations and the knowledge generated in the design process, I am able to classify capacitive proximity sensing in smart environments. This classification consists of a comparison to other popular sensing technologies in smart environments, the major benefits of capacitive proximity sensors, and their limitations. In order to support parties interested in developing smart environment applications using capacitive proximity sensors, I present a set of guidelines that support the decision process from technology selection to choice of processing methods.

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Wacker, Fred; Urban, Bodo (Betreuer); Bieber, Gerald (Betreuer)

Arbeitsgeräteidentifikation mittels Smartwatches

2014

Rostock, Univ., Diplomarbeit, 2014

In zahlreichen Branchen wie etwa der Forstwirtschaft, dem Straßenbau und der verarbeitenden Industrie werden motorisierte, handgeführte Arbeitsgeräte verwendet, die schädliche Vibrationen auf das Hand-Arm-System ihres Benutzers übertragen können. Langfristig kann dies zu gravierenden Gesundheitsschäden führen. Bisherige Überwachungstechnik zum Schutz vor Vibrationsbelastung ist kostenintensiv und erfordert in der Regel zusätzliche Arbeitsschritte. Diese Arbeit stellt ein Konzept zur automatischen Erkennung handgeführter Arbeitsgeräte durch handelsübliche Smartwatches vor. Dabei werden auf Basis der Daten von Beschleunigungssensor, Drehratensensor und Mikrofon Merkmale extrahiert, um durch Verfahren des maschinellen Lernens eine Differenzierung verschiedener Arbeitsgeräte untereinander sowie von Inaktivität zu ermöglichen. Als Nachweis der Umsetzbarkeit wurde mit 6 Arbeitsgeräten und 13 Probanden eine Evaluierung durchgeführt. Diese ergab, dass sich die Benutzung verschiedener Arbeitsgeräte unter den Versuchsbedingungen mit hoher Genauigkeit unterscheiden ließ. Grundsätzlich gelang dies auch anhand der Merkmale einzelner Sensoren. Die prototypische Implementierung gestattet eine Echtzeitüberwachung sowie eine langfristige Verfolgung der persönlichen Exposition gegenüber schädlichen Vibrationen. Durch eine semiautomatische Annotierung neuer Daten ist sie zudem in der Lage, auf einfache Weise um neue Arbeitsgeräte erweitert zu werden.

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Guest, Richard Matthew; Hurtado, Oscar Miguel; Henniger, Olaf

An Assessment of Methods for Image Recreation from Signature Time-series Data

2014

IET Biometrics, Vol.3 (2014), 3, pp. 159-166. Available online: 30 September 2013

Human signatures are widely used for biometric authentication. For automatic on-line signature verification, rather than storing an image of the completed signature, data is represented in the form of a time-series of pen position and status information allowing the extraction of temporal-based features. For visualization purposes, signature images need to be recreated from time-series data. In this paper we investigate the accuracy and verification performance of a series of interpolation methods for recreating a signature image from time-series data contained in two ISO/IEC data storage formats. Our experiments investigate dynamic data stored at various sample rates and signature images recreated at differing resolutions. Our study indicates possible best practice in terms of image recreation method, recreated image resolution, and temporal sample rate and assesses the effect of on the accuracy of reconstructed signature data.

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Schader, Philipp; Kuijper, Arjan (Betreuer); Steiger, Martin (Betreuer)

Assistiertes Energiemanagement durch Informationsvisualisierung

2014

Darmstadt, TU, Bachelor Thesis, 2014

Diese Arbeit beschreibt Konzepte zur Visualisierung von Energienetzen sowie zur Darstellung und Parametrisierung von Simulationen solcher. Es werden Darstellungen beschrieben mit denen sich ein Stromnetz darstellen lässt, sodass der Betriebszustand in dem es sich befindet zu erkennen ist. Weiter wird die Integration eines Simulators beschrieben mit dem Ziel ein interaktives System zu gestalten, welches durch die enge Verzahnung der Generierung und Darstellung von Daten, tiefe Einblicke in die Struktur des Versorgungsnetzes ermöglicht. Ein besonderes Augenmerk richtet sich hierbei auf die Möglichkeit die Simulationsergebnisse untereinander vergleichen zu können. Der im Rahmen dieser Arbeit entwickelte Prototyp verwendet die Konzepte auf Pegeldaten deutscher Wasserstraßen und zeigt so dass die Konzepte auch für allgemeine Sensornetzwerke verwendet werden können. Durch die Beschreibung eines konkreten Anwendungsfalls wird die Tauglichkeit der erarbeiteten Konzepte überprüft.

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Klamm, Christopher; Kuijper, Arjan (Betreuer); Burkhardt, Dirk (Betreuer)

Ausprägungen elektronischer Beteiligung in Industrie- und Entwicklungsländern: Ein anwendungsorientierter Vergleich am Beispiel Deutschland und Kenia

2014

Darmstadt, TU, Bachelor Thesis, 2014

Partizipation ist ein etabliertes Element der partizipatorischen Demokratie. Immer wieder werden Mechanismen entwickelt, um Partizipation zu erhöhen und zu festigen. Mit Hilfe der voranschreitenden Entwicklung von Informations- und Kommunikationstechnologien, eröffnen sich neue Möglichkeiten von Partizipationsansätzen. Diese finden auch zunehmend weltweiten Einsatz. Neue partizipatorische Formen verwenden ICT als Mittel zur Unterstützung der Partizipation (E-Partizipation). In welche Bahnen E-Partizipation bereits gelenkt wurde ist Gegenstand dieser Arbeit. Sie setzt sich mit der Ausprägung vorhandener E-Partizipationsformen auseinander und betrachtet dabei anwendungsbezogene Projekte. Das Untersuchungsumfeld wurde dabei auf einen Ländervergleich festgelegt. Es handelt sich um einen Vergleich zwischen Deutschland, als repräsentatives Industrieland und Kenia, als Repräsentant für ein Entwicklungsland. Dafür wird, mit Hilfe einer historischen und anwendungsorientierten Betrachtung der E-Partizipation in den Ländern, ein Kontext aufgestellt. Mit dessen Hilfe werden die E-Partizipationsbestrebungen in Deutschland und Kenia anschließend mittels einer aufgestellten Klassifikation vergleichend gegenübergestellt. Die Analyse zeigt, dass deutsche Projekte vermehrt staatlich (Top-Down) initiiert sind, wo-hingegen in Kenia häufiger eine nicht-staatliche Ausrichtung (Ground-Up) existent ist. Weiterhin ist in kenianischen Projekten die Form "Transparenz durch Dritte" stärker ausgeprägt, in Deutschland ist es hingegen die konsultative Form. Im Bereich des fokussierten Bedürfnisses überwiegt in Deutschland die soziale Bedürfnisbefriedung, während in Kenia auch noch Sicherheitsbedürfnisse bedeutsam sind. Im Bereich der ICT-Form zeigt sich eine ähnliche Verteilung innerhalb der Länder bei den Formen Alert, FAQ und Forum. Partielle Unterschiede sind in den Formen Blog und Bewertung ausgeprägt, starke Differenzen existieren dagegen bei den Formen Chat, Umfrage und Spiel als Partizipationsmittel. Für letztere gilt, dass Chat und Umfrage nur in deutschen und das Spiel nur in kenianischen Projekten verwendet wurden.

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Mesing, Benjamin; Lukas, Uwe von

Authoring of Automatic Data Preparation and Scene Enrichment for Maritime Virtual Reality Applications

2014

Shumaker, Randall (Ed.) et al.: Virtual Augmented and Mixed Reality. Applications of Virtual and Augmented Reality. Proceedings Part II : VAMR 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8526), pp. 426-434

International Conference Virtual Augmented and Mixed Reality (VAMR) <6, 2014, Heraklion, Crete, Greece>

When realizing virtual reality scenarios for the maritime sector a key challenge is dealing with the huge amount of data. Adding interactive behaviour for providing a rich interactive experience manually requires a lot of time and effort. Additionally, even though shipyards today often use PDM or PLM systems to manage and aggregate the data, the export to a visualisation format is not without problems and often needs some post procession to take place. We present a framework that combines the capabilities of processing large amounts of data for preparing virtual reality scenarios and enriching it with dynamic aspects like interactive door opening capabilities. An authoring interface allows orchestrating the data preparation chain by non-expert users to realise individual scenarios easily.

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Vayanou, Maria; Katifori, Akrivi; Karvounis, Manos; Kourtis, Vassilis; Kyriakidi, Marialena; Roussou, Maria; Tsangaris, Manolis; Ioannidis, Yannis; Balet, Olivier; Prados, Thibaut; Keil, Jens; Engelke, Timo; Pujol, Laia

Authoring Personalized Interactive Museum Stories

2014

Mitchell, Alex (Ed.) et al.: Interactive Storytelling : 7th International Conference on Interactive Digital Storytelling. ICIDS 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8832), pp.37-48

Joint International Conference on Interactive Digital Storytelling (ICIDS) <7, 2014, Singapore>

CHESS is a research prototype system aimed at enriching museum visits through personalized interactive storytelling. Aspiring to replace traditional exhibit-centric descriptions by story-centric cohesive narrations with carefully-designed references to the exhibits, CHESS follows a plot-based approach, where the story authors create stories around pre-selected museum themes. In this paper we place the CHESS system within the Interactive Digital Narrative field, describing the main objectives and requirements addressed. We present the system's architecture and outline its overall functionality. We describe the underlying storytelling model using examples from the stories authored using the CHESS Authoring Tool. Finally, we report key results focusing on the authors' perspective for the creation of personalized stories.

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Automated Kidney Detection and Segmentation in 3D Ultrasound

2014

Erdt, Marius (Ed.) et al.: Clinical Image-Based Procedures. Translational Research in Medical Imaging : Second International Workshop, CLIP 2013. Held in Conjunction with MICCAI 2013. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8361), pp. 83-90

International Workshop on Clinical Image-based Procedures (CLIP) <2, 2013, Nagoya, Japan>

Ultrasound provides the physical capabilities for a fast and save disease diagnosis in various medical scenarios including renal exams and patient trauma assessment. However, the experience of the ultrasound operator is the key element in performing ultrasound diagnosis. Thus, we like to introduce our automatic kidney detection and segmentation algorithm for 3D ultrasound. The approach utilizes basic kidney shape information to detect the kidney position. Following, the Level Set algorithm is applied to segment the detection result. In combination this method may help physicians and inexperienced trainees to achieve kidney detection and segmentation for diagnostic purposes.

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Automated Urban Management Processes: Integrating a Graphical Editor for Modular Domain-Specific Languages into a 3D GIS

2014

Schrenk, Manfred (Ed.) et al.: REAL CORP 2014. Plan it Smart. Clever Solutions for Smart Cities : Proceedings of 19th International Conference on Urban Planning, Regional Development and Information Society. Schwechat, 2014, pp. 99-108

International Conference on Urban Planning, Regional Development and Information Society <19, 2014, Vienna, Austria>

In this paper we present the results of integrating a graphical editor for geospatial processing workflows into a 3D GIS. We use modular domain-specific languages (DSLs) that are tailored to specific application domains. The vocabulary consists of so-called recipes that are grouped into cookbooks representing the language for a certain application domain. Recipes can be reused in multiple cookbooks. This approach allows for a good usability as the user quickly becomes familiar with the domain-specific languages by recognizing common recipes. In this paper we also describe guidelines for choosing the right granularity for recipes which allows for complex rules while using simplest possible recipes. We also describe a workflow for domain-specific language design based on ontologies to identify the correct domain vocabulary. Our approach can be used to automate processing of geospatial datasets in the area of urban planning. To evaluate our approach we use the implemented graphical rule editor in a practical scenario and present it to a user group from the urban API project.

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Brandherm, Florian; Kuijper, Arjan (Betreuer); Limper, Max (Betreuer)

Automatic Appearance-Preserving Generation of Compact 3D Models for the Web

2014

Darmstadt, TU, Bachelor Thesis, 2014

The goal of this thesis was to create a fully automatic processing pipeline to simplify big arbitrary triangle meshes to a degree that can be used inside a web page using WebGL. While the mesh complexity is decreased by orders of magnitude, the original meshes details (e.g. colors, normals) are preserved by capturing them in textures. These textures can then be applied to the simplified mesh to give it an appearance that is similar in detail as the original high resolution mesh. The proposed implementation makes it easy to incorporate such a simplified mesh into a website by providing an exporter that generates a web site with all necessary files in suitable file formats. Simplified, detail-preserving 3D models are generated in multiple independent steps: First, the mesh is simplified with the quadric edge collapse algorithm[9]. Then, a texture atlas is created by segmenting the simplified mesh and parameterizing the individual segments with Least Squares Conformal Maps[14]. After packing the individual segments into a texture atlas, the details of the high-resolution input mesh are captured in textures. At the end of this processing pipeline, the model is exported. The results show that the goal of creating file sizes that are small enough for a web page while preserving a reasonable amount of detail was reached. It is shown that the resulting files can compete with the alternative approach of creating interactive 3Dvisualizations with a series of pre-rendered images. The analysis of the results also shows that there is a lot of potential to increase the file size to detail ratio further.

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Knöbelreiter, Patrick; Berndt, Rene; Ullrich, Torsten; Fellner, Dieter W.

Automatic Fly-through Camera Animations for 3D Architectural Repositories

2014

Coquillart, Sabine (Ed.) et al.: GRAPP 2014 : Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications. SciTePress, 2014, pp. 335-341

International Conference on Computer Graphics Theory and Applications (GRAPP) <9, 2014, Lisbon, Portugal>

Virtual fly-through animations through computer generated models are a strong tool to convey properties and the appearance of these models. In, e.g., architectural models the big advantage of such a fly-through animation is that it is possible to convey the structure of the model easily. However, the path generation is not always trivial, to get a good looking animation. The proposed approach in this paper can handle arbitrary 3D models and then extract a meaningful and good looking camera path. To visualize the path HTML/X3DOM is used and therefore it is possible to view the final result in a browser with X3DOM support.

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Romann, René; Bieber, Gerald; Salomon, Ralf

Automatische Tremorerkennung mittels Smartphones und intelligenter Uhren

2014

Bieber, Gerald (Ed.) et al.: WOAR 2014 : Proceedings of the Workshop on Sensor-based Activity Recognition. Stuttgart: Fraunhofer Verlag, 2014, pp. 52-60

Workshop on Sensor-Based Activity Recognition (WOAR) <1, 2014, Rostock, Germany>

Dieser Tremor ist an und für sich nichts Schlimmes und ist bei allen Menschen vorhanden und beobachtbar. Doch kann ein verstärkter Tremor als Folge anderer Krankheitsbilder wie beispielsweise Parkinson oder in Folge körperlicher Extremzustände wie Unterzuckerung, Unterkühlung oder Stress auftreten und somit als Indikator für selbige dienen. Gegenwärtig wird die Tremorbestimmung ambulant im Krankenhaus durchgeführt, was für Patienten und Ärzte mit signifikantem Aufwand und somit hohen Kosten für das Gesundheitswesen verbunden ist. In diesem Beitrag wird untersucht, inwiefern sich der Tremor auch mit handelsüblichen Geräten wie Smartphones und Smartwatches vom Patienten selbstständig bestimmen lässt. Die durchgeführten Experimente weisen darauf hin, dass dies mit den Geräten der neusten Generation in vielen Fällen einfach und zuverlässig möglich ist.

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Neumann, Stephan; Kuijper, Arjan (Betreuer); Braun, Andreas (Betreuer)

Automotive Interfaces Using an Interactive Armrest

2014

Darmstadt, TU, Bachelor Thesis, 2014

Due to the rapid technological development of cars and their entertainment and infotainment systems, drivers are confronted with feature-rich interfaces that can become both confusing and distracting. Therefore, new ways of interaction between driver and car have to be developed in order to reduce driver distraction to a minimum. This is relevant to the safety of both the driver and road users surrounding him. In this thesis, gesture based interaction in the automotive is examined. The main focus is gestural interaction using capacitive sensors. In this area, an overview over related work is given. Challenges in developing a capacitive system for gesture based interaction in the automotive environment are presented and discussed. Afterwards, a model for a gesture-based input system using an augmented armrest is proposed. A prototypical system is implemented in order to test the possibilities and limitations of the proposed model. This system is then evaluated in order to test its general viability and to compare different kinds of gestures for interacting with in-car systems.

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A Benchmarking Model for Sensors in Smart Environments

2014

Aarts, Emile (Ed.) et al.: Ambient Intelligence : European Conference, AmI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8850), pp. 242-257

European Conference on Ambient Intelligence (AmI) <11, 2014, Eindhoven, The Netherlands>

In smart environments, developers can choose from a large variety of sensors supporting their use case that have specific advantages or disadvantages. In this work we present a benchmarking model that allows estimating the utility of a sensor technology for a use case by calculating a single score, based on a weighting factor for applications and a set of sensor features. This set takes into account the complexity of smart environment systems that are comprised of multiple subsystems and applied in non-static environments. We show how the model can be used to find a suitable sensor for a use case and the inverse option to find suitable use cases for a given set of sensors. Additionally, extensions are presented that normalize differently rated systems and compensate for central tendency bias. The model is verified by estimating technology popularity using a frequency analysis of associated search terms in two scientific databases.

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Damer, Naser; Opel, Alexander; Nouak, Alexander

Biometric Source Weighting in Multi-Biometric Fusion: Towards a Generalized and Robust Solution

2014

European Association for Speech, Signal and Image Processing (EURASIP): 2014 Proceedings of the 22nd European Signal Processing Conference (EUSIPCO), pp. 1382-1386

European Signal Processing Conference (EUSIPCO) <22, 2014, Lisbon, Portugal>

This work presents a new weighting algorithm for biometric sources within a score-level multi-biometric system. Those weights are used in the effective and widely used weighted sum fusion rule to produce multi-biometric decisions. The presented solution is mainly based on the characteristic of the overlap region between the genuine and imposter scores distributions. It also integrates the performance of the biometric source represented by its equal error rate. This solution aims at avoiding the shortcomings of previously proposed solutions such as low generalization abilities and sensitiveness to outliers. The proposed solution is evaluated along with the state of the art and best practice techniques. The evaluation was performed on two databases, the Biometric Scores Set BSSR1 and the Extended Multi Modal Verification for Teleservices and Security applications database and a satisfying and stable performance was achieved.

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Nouak, Alexander

Biometrie: Technik, Mythen, Praxisbeispiele: Die Gesellschaft muss intensive Diskussionen führen

2014

BvD-News, (2014), 3, pp. 30-32

Unter dem Begriff Biometrie ist das automatische Erkennen von Individuen anhand deren Verhalten und ihrer biologischen Charakteristika zu verstehen. In einer zunehmend technisierten Welt kann sie immer dann zum Einsatz kommen, wenn es darum geht, personengebundene Zugriffs- oder Zutrittsberechtigungen zu prüfen. Das kann der Zutritt zur eigenen Wohnung genauso sein wie die Einreise in einen fremden Staat. Zahlreiche Mythen ranken um diese Technologie: Sie sei für erhöhte Sicherheit geeignet, diene der Überwachung, ließe sich leicht durch Fälschungen umgehen und würde die Überwachung befördern. Diese Mythen schürten in der Vergangenheit auch eine gehörige Portion Angst, nicht zuletzt allein deshalb, weil ihre Funktionsweise nicht wirklich bekannt ist. Dieser Artikel will mit den größten Missverständnissen aufräumen.

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Brömme, Arslan; Busch, Christoph

BIOSIG 2014: Proceedings of the 13th International Conference of the Biometrics Special Interest Group

2014

Annual International Conference of the Biometrics Special Interest Group (BIOSIG) <13, 2014, Darmstadt, Germany>

GI-Edition - Lecture Notes in Informatics (LNI) P-230

Biometrics provides efficient and reliable solutions to recognize individuals. With increasing number of identity theft and misuse incidents we do observe a significant fraud in e-commerce and thus growing interests on trustworthiness of person authentication. Nowadays we find biometric applications in areas like border control, national ID cards, e-banking, e-commerce, e-health etc. Large-scale applications such as the European Union Visa Information System (VIS) and Unique Identification (UID) in India require high accuracy and also reliability, interoperability, scalability, system reliability and usability. Many of these are joint requirements also for forensic applications. Multimodal biometrics combined with fusion techniques can improve recognition performance. Efficient searching or indexing methods can accelerate identification efficiency. Additionally, quality of captured biometric samples can strongly influence the performance. BIOSIG 2014 offers you once again a platform for international experts' discussions on biometrics research and the full range of security applications.

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Steger, Teena; Fellner, Dieter W. (Betreuer); Sakas, Georgios (Betreuer); Wagner, Manfred (Betreuer)

Bronchoskopische Navigation mittels Pose Estimation des C-Bogens aus musterkodierten Fluoroskopie-Aufnahmen

2014

Darmstadt, TU, Diss., 2014

Die Bronchoskopie ist die wichtigste und sicherste Untersuchungsmethode bei Verdacht auf Lungenkrebs. Sie dient sowohl der visuellen Inspektion der Atemwege als auch der Gewebeentnahme an verdächtigen Läsionen. Erst aufgrund der so gewonnenen Probe kann entschieden werden, ob es sich um bösartiges Gewebe handelt. Damit die Biopsie an der korrekten Stelle durchgeführt wird, ist es besonders wichtig, dass die bronchoskopischen Operationsinstrumente präzise innerhalb des Bronchialbaums geführt werden können. Dabei behilft sich der Arzt zum einen mit der Kamera an der Bronchoskopspitze und zum anderen mit der intraoperativen C-Bogen-Durchleuchtung. Leider liefert keine dieser Visualisierungstechniken eine 3D-Sicht des Bronchialbaums oder die aktuelle 3D-Position des Instruments. Genau diese Hilfestellung leisten bronchoskopische Navigationssysteme und tragen somit erheblich zur Genauigkeit der Instrumentenführung und Beschleunigung des Eingriffs bei. Bronchoskopische Navigationssysteme verwenden meist EM-Sensoren, um die aktuelle Position des Instruments innerhalb der Bronchien zu verfolgen. Solche Systeme müssen nicht nur kostspielig und aufwändig installiert, sondern die jeweiligen getrackten Instrumente auch nach jedem Gebrauch teuer ersetzt werden. Um dieses Problem zu umgehen, wird auch an Systemen entwickelt, die lediglich die Bronchoskopvideobilder zur 2D/3D-Registrierung verwenden. Damit kann die Navigation aber nur so lange angeboten werden, wie die Bronchoskopspitze in die Bronchien vorgeschoben werden kann. Im Normalfall wird aber gerade in den nicht erreichbaren peripheren Verästelungen eine Navigationsstütze benötigt. Deshalb wird in dieser Arbeit ein Verfahren vorgestellt, welches unabhängig von der Bronchoskopreichweite anwendbar ist und ausschließlich auf die bereits vorhandene Ausstattung im OP-Saal zurückgreift. Somit wird eine höhere klinische Einsetzbarkeit und Akzeptanz erwartet. Die neuartige Grundidee ist hierbei, dass bei bekannter Aufnahmeposition des C-Bogens ein virtueller Strahl von C-Bogen-Röntgenquelle durch das Patienten-CT zur Instrumentenspitzenposition auf dem Durchleuchtungsbild generiert werden kann. Dieser 3D-Strahl schneidet dann den Bronchialbaum im CT genau an der Stelle, wo sich das Instrument aktuell befindet. Die große Herausforderung ist nun die C-Bogen Pose während der Aufnahme zu bestimmen. Dafür wurde von mir eine innovative Markerplatte entwickelt, die auf dem Patiententisch befestigt wird. Bei jeder Aufnahme wird ein Teil der radioopaken Marker auf der Durchleuchtung abgebildet. Um nun eine C-Bogen Pose Estimation durchzuführen, müssen die abgebildeten 2D-Marker eindeutig ihren korrespondierenden 3D-Markern auf der Platte zugeordnet werden. Deshalb habe ich bei der Anordnung der Marker erstmals die projektive Invariante Doppelverhältnis eingesetzt. Dies ermöglicht, dass die Marker auch nach Projektion verlässlich identifiziert und zugeordnet werden. Die entworfene Markerplatte wurde zahlreichen Experimenten unterzogen, darunter auch Phantom- und Tierkadavertests. Dabei wurden sehr gute quantitative Ergebnisse für die C-Bogen Pose Estimation bezüglich Erfolgsraten und Genauigkeiten gemessen. In dieser Arbeit stellt weitere wichtige Komponenten eines Bronchoskopie-Navigationssystems vor: Bronchialbaumsegmentierung und -skeletonisierung, Tumorsegmentierung, 2D-Instrumentenverfolgung, Patient-zu-Tisch-Registrierung, Pfadberechnung und 3D-Visualisierung. Dabei wurden vorhandene Lösungen aus der Literatur aufgegriffen bzw. erweitert aber auch neue Methoden entwickelt. Alle diese Komponenten wurden sowohl einzeln und als auch im Zusammenspiel miteinander untersucht. Bei Tests mit einem Bronchialbaumphantom erzielte sehr gute qualitative Ergebnisse..

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Tazari, Mohammad-Reza; Wichert, Reiner

Can the Market Breakthrough in AAL Be Provided by a Large Scale Pilot?

2014

Wichert, Reiner (Ed.) et al.: Ambient Assisted Living : 6. AAL-Kongress 2013. Berlin, Heidelberg, New York: Springer, 2014. (Advanced Technologies and Societal Change), pp. 343-356

Ambient Assisted Living (AAL) <6, 2013, Berlin, Germany>

Ambient Assisted Living is still on the cusp of a mainstream breakthrough, even though the market potential is tremendous. As barriers to the success of AAL, [1] mentions the lack of viable business models as well as the lack of ecosystems around common open platforms. Considering the fact that the EU has supported the development of universAAL as a true candidate for such common open platforms, this paper describes the next logical step towards the rollout of AAL throughout Europe based on this platform so that the foundation stone for the emergence of a self-organizing ecosystem is laid. In order to elaborate the feasibility of such rollouts, the European Commission published in early 2012 a CIP-ICT-PSP call for piloting AAL in large-scale based on interoperable platforms, where the winner was the proposal "make it ReAAL" that builds on universAAL as the common open platform. In addition to the applications coming with the universAAL Platform, the local vendors from each pilot region will offer their AAL products and services to the participating pilot sites. This means that a two-way adaptation is supposed to be addressed in ReAAL: on one hand, the universAAL native applications can be adapted to the requirements of the pilot sites, and on the other hand, the existing applications from the pilot regions can be integrated with the universAAL platform. Each Pilot site will then be able to select from this portfolio, those applications that are more suitable for their planned intervention. The mission of ReAAL is in this context to find out if the adaptation of a product to a common platform is economically reasonable when a company plans to enter the market with a new product idea. Based on this, ReAAL will hopefully show the cost-effectiveness of interoperable solutions compared to both vertical isolated solutions and comprehensive but closed systems. This should pave the way for the emergence of an ecosystem around a common open platform and based on that for the market breakthrough of AAL through interoperability.

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Große-Puppendahl, Tobias; Herber, Sebastian; Wimmer, Raphael; Englert, Frank; Beck, Sebastian; Wilmsdorff, Julian von; Wichert, Reiner; Kuijper, Arjan

Capacitive Near-Field Communication for Ubiquitous Interaction and Perception

2014

ACM SIGCHI: UbiComp' 14 : Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing. New York: ACM Press, 2014, pp. 231-242

International Conference on Ubiquitous Computing (Ubicomp) <16, 2014, Seattle, WA, USA>

Smart objects within instrumented environments offer an always available and intuitive way of interacting with a system. Connecting these objects to other objects in range or even to smartphones and computers, enables substantially innovative interaction and sensing approaches. In this paper, we investigate the concept of Capacitive Near-Field Communication to enable ubiquitous interaction with everyday objects in a short-range spatial context. Our central contribution is a generic framework describing and evaluating this communication method in Ubiquitous Computing. We prove the relevance of our approach by an open-source implementation of a low-cost object tag and a transceiver offering a high-quality communication link at typical distances up to 15 cm. Moreover, we present three case studies considering tangible interaction for the visually impaired, natural interaction with everyday objects, and sleeping behavior analysis.

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Frank, Sebastian; Braun, Andreas (Betreuer)

Capacitive Proximity Sensing Supported Advanced Driver Assistance System

2014

Rüsselsheim, Hochschule RheinMain, Master Thesis, 2014

This work's general topic is advanced driver assistance systems. In particular, it's about the assisted driver seat adjustment in dependence on anthropometric data, the detection of Out-of-Position postures and the driver drowsiness detection. Already existing systems use sensors like in- and off-cabin cameras to detect drowsiness or require the manual input of anthropometric data to adjust the driver's seat. Contrary to these system's approaches, the aim of this work is to build a system which captures drowsiness symptoms, tracks the head position and captures anthropometric data only by the use of invisible seat integrated capacitive proximity sensors. Still, the aim includes the evaluation of the system's concepts to give direction for further examinations. The idea is the integration of several capacitive proximity sensors at meaningful positions into a driver's seat. Owing to the fact that these sensors can sense through non-conductive materials, the sensors can be installed invisible under the seat cover. Furthermore, the sensors measure changes in the electric field. Occupants, which are in range of the sensors, change the electric field. Therefore, the sensor values shall give information about the occupant's anthropometry and position. With these anthropometric data, an assisted seat adjustment shall be possible. Especially the movement of the driver's head could give information about the driver's drowsiness. A first question of this report addresses the driver's anthropometry. What's a proper seat adjustment? Furthermore, what are the symptoms for drowsiness and which could be measured with capacitive proximity sensors? Moreover, what is an Out-of-Position posture? With information about the anthropometrical requirements, the work shows which concepts can meet the demands on the system. Owing to the fact that the system needs evaluation, how shall a prototype be developed with reference to the concepts? Due to the results of the evaluation, the concepts can satisfy the demands on the system. The ideas which rely on machine learning classifiers result in reliable data. Nevertheless, the different approaches show different demands on the collected data's diversity, which is used to train the algorithms. Besides the machine learning classifiers, many functions of the assisted seat adjustment depend on generic relations between the prototype's sensor system and the occupant's anthropometry. These functions show positive results. Nevertheless, a multiclass SVM approach with discrete adjustment classification could lead to better results, because this approach can include more sensors. Therefore, further obedience between the sensors' data and the anthropometry could be included. Several functions of advanced driver assistance systems are integrated into the capacitive proximity sensing supported advanced driver assistance system. The evaluation shows that invisibly seat integrated capacitive proximity sensors can sense several symptoms of driver drowsiness. Furthermore, the system can assist the driver's seat adjustment and detect "Out-of-Position" postures. The detection concepts are constrained by several requirements for a proper working system. Consequently, the next step is a further integration of the system into a real car. Supplementary, the evaluation shows that the machine learning concepts require a plenty of miscellaneous data. Hence, a further data collection will improve the systems creditableness. Besides the further data collection and real system integration, the developed prototype can be the basis for a further function development, like the gesture recognition for the control of a multimedia system.

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Katifori, Akrivi; Karvounis, Manos; Kourtis, Vassilis; Kyriakidi, Marialena; Roussou, Maria; Tsangaris, Manolis; Vayanou, Maria; Ioannidis, Yannis; Balet, Olivier; Prados, Thibaut; Keil, Jens; Engelke, Timo; Pujol, Laia

CHESS: Personalized Storytelling Experiences in Museums

2014

Mitchell, Alex (Ed.) et al.: Interactive Storytelling : 7th International Conference on Interactive Digital Storytelling. ICIDS 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8832), pp. 232-235

Joint International Conference on Interactive Digital Storytelling (ICIDS) <7, 2014, Singapore>

In this work, we present the CHESS research prototype system which offers personalized, interactive digital storytelling experiences to enhance museum visits, demonstrating the authoring and visiting experiences.

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Erdt, Marius; Linguraru, Marius George; Oyarzun Laura, Cristina; Shekhar, Raj; Wesarg, Stefan; González Ballester, Miguel Angel; Drechsler, Klaus

Clinical Image-Based Procedures. Translational Research in Medical Imaging: Second International Workshop, CLIP 2013. Held in Conjunction with MICCAI 2013

2014

International Workshop on Clinical Image-based Procedures (CLIP) <2, 2013, Nagoya, Japan>

Lecture Notes in Computer Science (LNCS) 8361

This book constitutes revised selected papers from the International Workshop on Clinical Image-Based Procedures, CLIP 2013, held in conjunction with MICCAI 2012 in Nagoya, Japan, in September 2013. The 19 papers presented in this volume were carefully reviewed and selected from 26 submissions. The workshop was a productive and exciting forum for the discussion and dissemination of clinically tested, state-of-the-art methods for image-based planning, monitoring and evaluation of medical procedures.

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Linguraru, Marius George; Oyarzun Laura, Cristina; Shekhar, Raj; Wesarg, Stefan; González Ballester, Miguel Angel; Drechsler, Klaus; Sato, Yoshinobu; Erdt, Marius

Clinical Image-Based Procedures. Translational Research in Medical Imaging: Third International Workshop, CLIP 2014. Held in Conjunction with MICCAI 2014

2014

International Workshop on Clinical Image-based Procedures (CLIP) <3, 2014, Boston, MA, USA>

Lecture Notes in Computer Science (LNCS) 8680

CLIP 2014 provided a successful forum for the dissemination of emerging image-based clinical techniques. Specific topics included pre-interventional image segmentation and classification (to support diagnosis and clinical decision making), interventional and surgical planning and analysis of dynamic images, and evaluation, visualization and correction techniques for image-based procedures. Clinical applications covered the skull and the brain, cardiac defects, blood vessels, abdominal organs, and cancer in adults and children. The presentations and discussions around the meeting emphasized current challenges and emerging techniques in image-based procedures, strategies for clinical translation of image-based techniques, the role of computational anatomy and image analysis for surgical planning and interventions, and the contribution of medical image analysis to open and minimally invasive surgery.

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Hadjiprocopis, Andreas; Wenzel, Konrad; Rothermel, Mathias; Ioannides, Marinos; Fritsch, Dieter; Klein, Michael; Johnsons, Paul S.; Weinlinger, Guenther; Doulamis, Anastasios; Protopapadakis, Eftychios; Kyriakaki, Georgia; Makantasis, Kostas; Fellner, Dieter W.; Stork, André; Santos, Pedro

Cloud-based 3D Reconstruction of Cultural Heritage Monuments using Open Access Image Repositories

2014

Klein, Reinhard (Ed.) et al.: GCH 2014. Short Papers - Posters : Eurographics Workshop on Graphics and Cultural Heritage. Goslar: Eurographics Association, 2014, pp. 5-8

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

A large number of photographs of cultural heritage items and monuments is publicly available in various Open Access Image Repositories (OAIR) and social media sites. Metadata inserted by camera, user and host site may help to determine the photograph content, geo-location and date of capture, thus allowing us, with relative success, to localise photos in space and time. Additionally, developments in Photogrammetry and Computer Vision, such as Structure from Motion (SfM), provide a simple and cost-effective method of generating relatively accurate camera orientations and sparse and dense 3D point clouds from 2D images. Our main goal is to provide a software tool able to run on desktop or cluster computers or as a back end of a cloud-based service, enabling historians, architects, archaeologists and the general public to search, download and reconstruct 3D point clouds of historical monuments from hundreds of images from the web in a cost-effective manner. The end products can be further enriched with metadata and published. This paper describes a workflow for searching and retrieving photographs of historical monuments from OAIR, such as Flickr and Picasa, and using them to build dense point clouds using SfM and dense image matching techniques. Computational efficiency is improved by a technique which reduces image matching time by using an image connectivity prior derived from low-resolution versions of the original images. Benchmarks for two large datasets showing the respective efficiency gains are presented.

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Damer, Naser; Opel, Alexander; Nouak, Alexander

CMC Curve Properties and Biometric Source Weighting in Multi-Biometric Score-level Fusion

2014

International Society of Information Fusion (ISIF): FUSION 2014 : 17th International Conference on Information Fusion. The Institute of Electrical and Electronics Engineers (IEEE), 2014, 6 p.

International Conference on Information Fusion (FUSION) <17, 2014, Salamanca, Spain>

Multi-biometrics tries to build a unified biometric decision based on multiple biometric sources in an effort to gain more accuracy and robustness. Multi-biometric fusion aims at optimally combining the information produced by the multiple biometric sources, this usually requires assigning relative weights for the biometric sources to optimize their effect on the final decision. This work presents a new approach for biometric sources weighting within a score-level multi-biometric system. The presented solution tries to investigate the properties of the cumulative match characteristic (CMC) curve, which represents the biometric performance under the identification scenario, and extract biometric source weights based on those properties. The proposed solution is evaluated along with a set of state of the art and best practice weighting techniques. The evaluation was performed on the Biometric Scores Set BSSR1 database and a satisfying and stable performance was achieved.

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Daun, Kevin; Weber, Daniel (Betreuer)

Collision Handling between Rigid and Deformable Bodies with Continuous Penalty Forces

2014

Darmstadt, TU, Bachelor Thesis, 2014

Collision handling has been an active research topic in the area of the physically-based simulation of rigid and deformable bodies for many years. A common approach in interactive environments are discrete penalty forces, computing a repulsion forced based on the penetration at one moment in the time step. They provide low computational costs and good scalability, though they suffer from jitter and instability. Tang et al. [18] improved the approach of discrete penalty forces and introduced 2012 the continuous penalty forces, continuously accumulating penalty forces along the penetration trajectory over the whole time step. Thereby, the jitter and instability issues are reduced. Although, the continuous penalty forces show artifacts especially for enduring contacts, precluding the simulation of sliding contacts. In this thesis, we present a unified system to handle collisions between rigid and deformable bodies with friction. We modify the integration scheme by Bridson et al. [4] to handle rigid and deformable bodies, apply a continuous collision detection [16], handle the detected collisions with continuous penalty forces [18] and apply a penalty-based friction model [23]. We discuss the artifacts arising from the continuous penalty forces algorithm, examine methods to tackle them and apply the new methods to the continuous penalty forces algorithm. Finally, we analyze the results of the continuous penalty forces algorithm in comparison to discrete penalty forces, evaluate our new algorithm to handle the continuous penalty forces artifacts and inspect further improvements.

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Preiss, Jens; Fernandes, Felipe; Urban, Philipp

Color-Image Quality Assessment: From Prediction to Optimization

2014

IEEE Transactions on Image Processing, Vol.23 (2014), 3, pp. 1366-1378

While image-difference metrics show good prediction performance on visual data, they often yield artifact-contaminated results if used as objective functions for optimizing complex image-processing tasks. We investigate in this regard the recently proposed color-image-difference (CID) metric particularly developed for predicting gamut-mapping distortions. We present an algorithm for optimizing gamut mapping employing the CID metric as the objective function. Resulting images contain various visual artifacts, which are addressed by multiple modifications yielding the improved color-image-difference (iCID) metric. The iCID-based optimizations are free from artifacts and retain contrast, structure, and color of the original image to a great extent. Furthermore, the prediction performance on visual data is improved by the modifications.

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Samadzadegan, Sepideh; Blahová, Jana; Urban, Philipp

Color-Printed Gloss: Relating Measurements to Perception

2014

The Society for Imaging Science and Technology (IS&T): 22nd Color and Imaging Conference. Final Program and Proceedings. Springfield: IS&T, 2014, pp. 207-211

Color and Imaging Conference (CIC) <22, 2014, Boston, MA, USA>

In order to assess the print quality, color and gloss are two important factors that should always be considered. In this paper, we investigate the impact of color on gloss using printed color samples varying between low and medium gloss levels. A psychophysical experiment was conducted to relate specular gloss measurements to perception. Results show that second order polynomials describe well this relationship independently of the underlying color. Following the same trend for all colors, the magnitude of perceived gloss decreases with increasing lightness.

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Combining Computational Models and Interactive Visualization to Support Rational Decision Making

2014

Bebis, George (Ed.) et al.: Advances in Visual Computing. 10th International Symposium, ISVC 2014 : Proceedings, Part I. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8887), pp. 345-356

International Symposium on Visual Computing (ISVC) <10, 2014, Las Vegas, NV, USA>

Decision making is a complex process consisting of several consecutive steps. Before converting a decision into effective action the problem to be tackled needs to be analyzed, alternative solutions need to be developed, and the best solution needs to be picked. In many cases computational models support decision makers in this process. Therefore, providing an intuitive access to these model-driven techniques is crucial. In this approach, we introduce a decision support system that provides visual-interactive access to three computational models - a simulation model, an optimization model, and an opinion mining model - covering different aspects of decision making. For each model our decision support system realizes the visual access to the model, an in-depth analysis of the generated solutions, and the comparison of alternative solutions. Finally, we evaluate the usefulness and the usability of our system in a use case in the field of public policy making.

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Aderhold, Andreas; Wilkosinska, Katarzyna; Corsini, Massimiliano; Jung, Yvonne; Graf, Holger; Kuijper, Arjan

The Common Implementation Framework as Service - Towards Novel Applications for Streamlined Presentation of 3D Content on the Web

2014

Marcus, Aaron (Ed.): Design, User Experience, and Usability. Proceedings Part II : User Experience Design for Diverse Interaction Platforms and Environments. DUXU 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8518), pp. 3-14

International Conference on Design, User Experience and Usability (DUXU) <3, 2014, Heraklion, Crete, Greece>

We solve a standing issue of the recently published Common Implementation Framework (CIF) for Online Virtual Museums: programmatic access to the transcoding, optimization and template rendering infrastructure of the CIF. We propose a method that enables researchers and developers to build novel systems on top of the CIF infrastructure beyond its current Cultural Heritage workflow. Therefore, we introduce a way to programmatically access the powerful backend of the CIF through a universal access layer, addressable by standards like HTTP and the JSON Data Interchange Format. In order to demonstrate our approach, we present two different use cases in which the CIF pipeline is utilized as a service through the proposed resource-based access layer: a native mobile iOS application for browsing 3D model repositories realizing just-in-time optimization of large models, and a MeshLab plugin to asynchronously convert and prepare a model for the Web.

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Comparison of e-Participation Roadmap in Industrial and Developing Countries based on Germany and Kenya

2014

Estevez, Elsa (Ed.) et al.: ICEGOV 2014 : Proceedings of the 8th International Conference on Theory and Practice of Electronic Governance. New York: ACM Press, 2014, pp. 399-402

International Conference on Theory and Practice of Electronic Governance (ICEGOV) <8, 2014, Guimaraes, Portugal>

This paper compares the E-Participation roadmaps of industrial and developing countries, based on Germany and Kenya as representatives. Therefore, the ICT roadmap of each country is de-scribed in a clear shape and with representative E-Participation projects of each country. Based on these projects, the comparison is performed on a categorical level in terms of (1) participation forms, (2) used ICT, and (3) socio-political requirements. After-wards, the results are summarized to determine an overall view on the E-Participation situation in both countries. As a result of the comparison similarities and significant differences will be identified. The results are useful for software developing organizations that want to create ICT governance tools for industrial as well as developing countries and therefore need to consider the characteristics and requirements of both country types.

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Edelsbrunner, Johannes; Krispel, Ulrich; Havemann, Sven; Sourin, Alexei; Fellner, Dieter W.

Constructive Roof Geometry

2014

2014 International Conference on Cyberworlds : CW 2014. Los Alamitos, Calif.: IEEE Computer Society Conference Publishing Services (CPS), 2014, pp. 63-70

International Conference on Cyberworlds (CW) <13, 2014, Santander, Spain>

While the growing demand for new building models contained in virtual worlds, games, and movies, makes the easy and fast creation of modifiable models more and more important, 3D modeling of buildings can be a tedious task due to their sometimes complex geometry. For historic buildings, especially the roofs can be challenging. We present a new method of combining simple building solids to form more complex buildings, and give an emphasis on the blending of roof faces. This can be integrated in common pipelines for procedural modeling of buildings and will bring more expressiveness than existing methods.

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Grabner, Harald; Ullrich, Torsten; Fellner, Dieter W.

Content-based Retrieval of 3D Models using Generative Modeling Techniques

2014

Klein, Reinhard (Ed.) et al.: GCH 2014. Short Papers - Posters : Eurographics Workshop on Graphics and Cultural Heritage. Goslar: Eurographics Association, 2014, pp. 10-12

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

In this paper we present a novel 3D model retrieval approach based on generative modeling techniques. In our approach generative models are created by domain experts in order to describe 3D model classes. These generative models span a shape space, of which a number of training samples is taken at random. The samples are used to train content-based retrieval methods. With a trained classifier, techniques based on semantic enrichment can be used to index a repository. Furthermore, as our method uses solely generative 3D models in the training phase, it eliminates the cold start problem. We demonstrate the effectiveness of our method by testing it against the Princeton shape benchmark.

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Gutzeit, Enrico; Scheel, Christian; Dolereit, Tim; Rust, Matthias

Contour Based Split and Merge Segmentation and Pre-classification of Zooplankton in Very Large Images

2014

Battiato, Sebastiano (Ed.) et al.: VISAPP 2014 - Volume I : Proceedings of the International Conference on Computer Vision Theory and Applications. SciTePress, 2014, pp. 417-424

International Conference on Computer Vision Theory and Applications (VISAPP) <9, 2014, Lisbon, Portugal>

Zooplankton is an important component in the water ecosystem and food chain. To understand the influence of zooplankton on the ecosystem a data collection is necessary. In research the automatic image based recognition of zooplankton is of growing interest. Several systems have been developed for zooplankton recognition on low resolution images. For large images approaches are seldom. Images of this size easily exceed the main memory of standard computers. Our novel automatic segmentation approach is able to handle these large images. We developed a contour based Split & Merge approach for segmentation and, to reduce the nonzooplankton segments, combine it with a pre-classification of the segments in reference to their shape. The latter includes a detection of quasi round segments and a novel one for thin segments. Experimental results on several large images show that we are able to handle them satisfactorily.

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Controlling the Processing of Smart City Data in the Cloud with Domain-Specific Languages

2014

2014 IEEE/ACM 7th International Conference on Utility and Cloud Computing : UCC 2014. Los Alamitos, Calif.: IEEE Computer Society, 2014, pp. 824-829

International Conference on Utility and Cloud Computing (UCC) <7, 2014, London, England, United Kingdom>

In this paper a new user interface for the processing of big geospatial data in the Cloud is presented. The paper focuses on the processing of Smart City data since this kind of data is inherently large and becomes more and more important for the maintenance and planning of sustainable future Smart Cities. The user interface is facilitated by Domain-Specific Languages (DSLs) that are tailored to the urban planning domain. In this paper a modelling method for DSLs is described and then applied to an example use case from the research project IQmulus funded by the European Commission. The resulting DSL is specified using a Parsing Expression Grammar (PEG) which is used to automatically generate a language parser. Furthermore, a technique to interpret scripts written in the Domain-Specific Language is presented. This technique makes use of mapping rules that specify how the interpreter has to translate terms in the DSL to processing services in the Cloud.

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Converting Underwater Imaging into Imaging in Air

2014

Battiato, Sebastiano (Ed.) et al.: VISAPP 2014 - Volume I : Proceedings of the International Conference on Computer Vision Theory and Applications. SciTePress, 2014, pp. 96-103

International Conference on Computer Vision Theory and Applications (VISAPP) <9, 2014, Lisbon, Portugal>

The application of imaging devices in underwater environments has become a common practice. Protecting the camera's constituent electric parts against water leads to refractive effects emanating from the water-glassair transition of light rays. These non-linear distortions can not be modeled by the pinhole camera model. For our new approach we focus on flat interface systems. By handling refractive effects properly, we are able to convert the problem to imaging conditions in air. We show that based on the location of virtual object points in water, virtual parameters of a camera following the pinhole camera model can be computed per image ray. This enables us to image the same object as if it was situated in air. Our novel approach works for an arbitrary camera orientation to the refractive interface. We show experimentally that our adopted physical methods can be used for the computation of 3D object points by a stereo camera system with much higher precision than with a naive in-situ calibration.

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Becker, Tilman; Burghart, Catherina; Nazemi, Kawa; Ndjiki-Nya, Patrick; Riegel, Thomas; Schäfer, Ralf; Sporer, Thomas; Tresp, Volker; Wissmann, Jens

Core Technologies for the Internet of Services

2014

Wahlster, Wolfgang (Ed.) et al.: Towards the Internet of Services: The THESEUS Research Program. Berlin, Heidelberg, New York: Springer, 2014. (Cognitive Technologies), pp. 59-88

Information and knowledge are growing permanently and represent valuable resources for many enterprises. The efficient access to knowledge of an enterprise like expertise, contact persons, project and milestone plans, etc. may simplify business processes and lead to time and cost savings. Semantic technologies offer numerous possibilities to enrich data with background information about their meaning. Such semantic relations do not only lead to more efficient search in larger information repositories but they also assist the user in diverse processes like editing, annotation, and processing of information. In addition they offer new means of access and transfer of knowledge. Each information unit is linked to other units in the same domain, which allows faster search and offers a way of information access that is close to the habits of humans, i.e. the creation of knowledge and its association to already existing knowledge. This approach of the whole THESEUS research program was also the basis of the CORE TECHNOLOGY CLUSTER of THESEUS.

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Jung, Florian; Steger, Sebastian; Knapp, Oliver; Noll, Matthias; Wesarg, Stefan

COSMO - Coupled Shape Model for Radiation Therapy Planning of Head and Neck Cancer

2014

Linguraru, Marius George (Ed.) et al.: Clinical Image-Based Procedures. Translational Research in Medical Imaging : Third International Workshop, CLIP 2014. Held in Conjunction with MICCAI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8680), pp. 25-32

International Workshop on Clinical Image-based Procedures (CLIP) <3, 2014, Boston, MA, USA>

Radiation therapy plays a major role in head and neck cancer treatment. Segmentation of organs at risk prior to the radiation therapy helps to prevent the radiation beam from damaging healthy tissue, whereas a concentrated ray can target the cancerous regions. Unfortunately, the manual annotation of all relevant structures in the head and neck area is very time-consuming and existing atlas-based solutions don't provide sufficient segmentation accuracy. Therefore, we propose a coupled shape model (CoSMo) for the segmentation of key structures within the head and neck area. The model's adaptation to a test image is done with respect to the appearance of its items and the trained articulation space. 40 data sets labeled by clinicians containing 22 structures were used to build the CoSMo. Even on very challenging data sets with unnatural postures, which occur far more often than expected, the model adaptation algorithm succeeds. A first evaluation showed an average directed Hausdorff distance of 13.22mm and an average DICE overlap of 0.62. Furthermore, we review some of the challenges we encountered during the course of building our model from image data, taken from actual radiation therapy planing cases.

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Santos, Pedro; Ritz, Martin; Tausch, Reimar; Schmedt, Hendrik; Monroy Rodriguez, Rafael; Stefano, Antonio; Posniak, Oliver; Fuhrmann, Constanze; Fellner, Dieter W.

CultLab3D - On the Verge of 3D Mass Digitization

2014

Klein, Reinhard (Ed.) et al.: GCH 2014 : Eurographics Workshop on Graphics and Cultural Heritage. Goslar: Eurographics Association, 2014, pp. 65-73

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

Acquisition of 3D geometry, texture and optical material properties of real objects still consumes a considerable amount of time, and forces humans to dedicate their full attention to this process. We propose CultLab3D, an automatic modular 3D digitization pipeline, aiming for efficient mass digitization of 3D geometry, texture, and optical material properties. CultLab3D requires minimal human intervention and reduces processing time to a fraction of today's efforts for manual digitization. The final step in our digitization workflow involves the integration of the digital object into enduring 3D Cultural Heritage Collections together with the available semantic information related to the object. In addition, a software tool facilitates virtual, location-independent analysis and publication of the virtual surrogates of the objects, and encourages collaboration between scientists all around the world. The pipeline is designed in a modular fashion and allows for further extensions to incorporate newer technologies. For instance, by switching scanning heads, it is possible to acquire coarser or more refined 3D geometry.

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CultLab3D: Ein mobiles 3D-Scanning Szenario für Museen und Galerien

2014

Bienert, Andreas (Ed.) et al.: EVA 2014 Berlin. Proceedings : Elektronische Medien & Kunst, Kultur, Historie. Berlin: Gesellschaft zur Förderung angewandter Informatik e.V., 2014, pp. 106-109

Electronic Imaging & the Visual Arts (EVA) <21, 2014, Berlin, Germany>

Im Projekt CultLab3D werden Kulturgüter dreidimensional und in sehr hoher Qualität erfasst. Dabei geht es um die Entwicklung einer neuartigen Scan-Technologie in Form eines mobilen Digitalisierungslabors, das aus flexibel einsetzbaren Modulen für die schnelle und ökonomische Erfassung von 3DGeometrie-, Textur- und Materialeigenschaften besteht. Dabei soll langfristig die Qualität der Daten auch wissenschaftlichen Ansprüchen genügen, die bislang Originalvorlagen erfordern. Das System soll hinsichtlich des Aufwands (u.a. Scan-Geschwindigkeit), der erzielbaren Qualität und der Kosten den Markt revolutionieren. Eine Marktreife wird für 2015 erwartet.

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Zander-Walz, Sebastian; Kuijper, Arjan (Betreuer); Braun, Andreas (Betreuer)

Curved Large-Area Surfaces for Gestural Interaction

2014

Darmstadt, TU, Bachelor Thesis, 2014

Gestures are a natural and intuitive part of human communication. Since the appearance of smartphones and tablet computers, gestural interaction became suitable to many customers. Usually gesture interaction is implemented using two dimensional planar surfaces, although the natural movement of the human body results in elliptic or spherical paths. This thesis shows a way of equipping large-area curved surfaces with capacitive loading-mode proximity sensors and gesture recognition from theses sensors data. Therefore already existing techniques, wellknown from the use in planar system, were adapted to the use in curved prototypes. To prove the results both, the interaction with the prototype and the gesture recognition have been evaluated and the results discussed.

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Liang, Rong-Hao; Chan, Liwei; Tseng, Hung-Yu; Kuo, Han-Chih; Huang, Da-Yuan; Yang, De-Nian; Chen, Bing-Yu; Große-Puppendahl, Tobias; Beck, Sebastian; Wilbers, Daniel; Kuijper, Arjan; Heo, Heejeong; Park, Hyungkun; Kim, Seungki; Chung, Jeeyong; Lee, Geehyuk; Lee, Woohun; Unander-Scharin, Carl; Unander-Scharin, Aasa; Höök, Kristina; Elblaus, Ludvig

Demo Hour

2014

Interactions, Vol.21 (2014), 5, pp.6-9

Conference on Human Factors in Computing Systems (CHI) <32, 2014, Toronto,Canada>

Interactivity is a unique forum of the ACM CHI Conference that showcases hands-on demonstrations, novel interactive technologies, and artistic installations. At CHI 2014, we aimed to create a "one of a CHInd" Interactivity experience with more than 60 interactive exhibits to highlight the diverse group of computer scientists, sociologists, designers, psychologists, artists, and many more that make up the CHI community.

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Wang, Anqi; Sakas, Georgios (Betreuer); Noll, Matthias (Betreuer)

Detektion von Tumorgewebe und invasiver Tumorgrenze in CD3/CD8 gefärbten Gewebeschnitten (Histopathologien)

2014

Darmstadt, TU, Master Thesis, 2014

Konventionelle Krankheitsprognose bei Krebserkrankungen basiert auf Größe des Tumors, Auftrittsort von Krebszellen und Vorliegen von Metastasen. Diese Anzeichen lassen jedoch keine Aussage über den postoperativen Krankheitsverlauf zu. Erste Studien haben ergeben, dass in solchen Fällen die Betrachtung der Immunantwort des Körpers eine zuverlässigere Vorhersage treffen kann. Die Immunantwort drückt sich in Art und Auftrittshäufigkeit von Immunzellen (sogenannte T-Zellen) in und um den Tumor aus. Zur Validierung dieser These wird in der vorliegenden Arbeit ein Verfahren entwickelt, das automatisch auf CD3/CD8-gefärbten histopathologischen Aufnahmen den Tumor und die invasive Tumorgrenze segmentiert. In Kombination mit einer anderen Arbeit, die ein Verfahren zur Zellenzählung implementiert, sollen große Datenmengen von Patienten evaluiert werden, deren Krankheitsverlauf bekannt ist. Die größte Herausforderung dieser Arbeit besteht im verwendeten Material. Üblicherweise wird Gewebe auf HE-gefärbten Aufnahmen segmentiert. CD3/CD8 sind hingegen Färbungen, welche T-Zellen klar erkennbar darstellen, aber unterschiedliche Gewebearten nur wenig differenzieren. Eine zusätzliche Schwierigkeit ist die Entwicklung des Verfahrens bei einer kleinen Menge an verfügbaren Trainings- und Testdaten. Aus der Aufgabenstellung ergeben sich für das Verfahren die Anforderungen Geschwindigkeit (Evaluation großer Datenmengen) und Genauigkeit der Segmentierung. Die Geschwindigkeitsanforderung wird erfüllt, indem effizient zu berechnende und gleichzeitig aussagekräftige Features als Eingabe für ein Clustering-Algorithmus verwendet werden. Die Verarbeitung einer Aufnahme dauert durchschnittlich 5 Minuten. Gemessen an dem Zeitaufwand eines Pathologen für die gleiche Aufgabe ist dies eine große Zeitersparnis. Die Evaluation ergab einen durchschnittlichen Accuracy-Wert von 0,94. Dieser Wert ist vergleichbar mit den Ergebnissen verwandter State of the Art Methoden, welche auf HE-gefärbten Aufnahmen arbeiten.

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Deterministic Local Layouts through High-Dimensional Layout Stitching

2014

Kurosu, Masaaki (Ed.): Human-Computer Interaction: Part 1 : Theories, Methods, and Tools. HCI International 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8510), pp. 643-651

International Conference on Human-Computer Interaction (HCII) <16, 2014, Heraklion, Crete, Greece>

In this paper we present a layout technique for dynamic views of large static graphs. It aims to minimize changes between two consecutive frames and most importantly, it is deterministic. First, a set of small layout patches is pre-computed. Then, depending on the users view focus, a subset of these patches is selected and connected to generate the final layout. In contrast to the state-of-the-art approach that operates in the 2D screen space only, we perform this process in high-dimensional space before projecting the results into the 2D plane. This gives additional degrees of freedom and consequently a smoother transition process between two consecutive frames. Whenever the user visits an area of the graph for a second time, the layout will still look the same. This enables the user to recognize areas that have already been explored and thus preserve the mental map.

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Schwertel, Uta; Diener, Holger; Heinitz, Antje; Schäfer, Markus; Schlemminger, Andreas

Digitale Bildungsdienste für Elektromobilität - Beispiele aus dem Projekt MEMO

2014

IM+io, (2014), Special 01, pp. 66-72

Digitale Medien, der Einsatz von Web 2.0-Technologien und mobile Anwendungen erhalten eine immer größere Bedeutung in informellen, aber auch formalen beruflichen Bildungsprozessen. Eine spannende Frage ist: Wie können digitale Bildungsdienste speziell in Berufen des Handwerks den Praxisbezug und die Nutzung an verschiedenen Lern- und Arbeitsorten unterstützen? Das Projekt MEMO entwickelte am Beispiel Elektromobilität eine Sammlung webbasierter und mobiler Lerndienste, die Wissentransfer, Kollaboration und Qualifizierung im Kfz-Handwerk und vergleichbaren Domänen unterstützen.

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Wichmann, Julian L.; Booz, Christian; Wesarg, Stefan; Kafchitsas, Konstantinos; Bauer, Ralf W.; Kerl, J. Matthias; Lehnert, Thomas; Vogl, Thomas J.; Khan, M. Fawad

Dual-Energy CT-based Phantomless in Vivo Three-dimensional Bone Mineral Density Assessment of the Lumbar Spine

2014

Radiology, Vol.271 (2014), 3, pp. 778-784

Purpose: To evaluate the feasibility of phantomless in vivo dual-energy computed tomography (CT)-based three-dimensional (3D) bone mineral density (BMD) assessment in comparison with dual x-ray absorptiometry (DXA). Materials and Methods: This retrospective study was approved by the institutional review board, and the requirement to obtain informed consent was waived. Data from clinically indicated dual-energy CT and DXA examinations within 2 months, comprising the lumbar spine of 40 patients, were included. By using automated dedicated postprocessing dual-energy CT software, the trabecular bone of lumbar vertebrae L1-L4 were analyzed and segmented. A mixed-effects model was used to assess the correlations between BMD values derived from dual-energy CT and DXA. Results: One hundred sixty lumbar vertebrae were analyzed in 40 patients (mean age, 57.1 years; range, 24-85 years), 21 male (mean age, 54.3 years; range, 24-85 years) and 19 female (mean age, 58.5 years; range, 31-80 years). Mean BMD of L1-L4 determined with DXA was 0.995 g/ cm², and 18 patients (45%) showed an osteoporotic BMD (T score less than 22.5) of at least two vertebrae. Mean dual-energy CT-based BMD of L1-L4 was 0.254 g/cm³. Bland-Altman analysis with mixed effects demonstrated a lack of correlation between dual-energy CT-based and DXA-based BMD values, with a mean difference of 0.7441 and 95% limits of agreement of 0.7441 +/- 0.4080. Conclusion: Dedicated postprocessing of dual-energy CT data allows for phantomless in vivo BMD assessment of the trabecular bone of lumbar vertebrae and enables freely rotatable color-coded 3D visualization of intravertebral BMD distribution.

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Gennies, Maria; Urban, Bodo (Betreuer); Gutzeit, Enrico (Betreuer); Zhou, Zhiliang (Betreuer)

Echtzeit-Gesichtsdetektion und -verschleierung in Videos unter praktischen Bedingungen

2014

Magdeburg, Univ., Diplomarbeit, 2014

Die Detektion und Verschleierung von Gesichtern in Videoströmen verschiedener Kameras aus Innen- und Außengeländebereichen stellt eine besondere Herausforderung dar. In der vorliegenden Arbeit werden die theoretischen Grundlagen dieser Fragestellung näher betrachtet, ein umfassendes Konzept zur automatischen Gesichtsdetektion und -verschleierung unter den gegebenen praktischen Bedingungen entwickelt sowie die Umsetzung und Resultate der grundlegenden Systemarchitektur erläutert. Das vorgestellte prototypische System besteht aus einer Kombination von Bildvorverarbeitungsmethoden, der fensterbasierten Merkmalsextraktion mit Haar-like Features, der Lernkomponente AdaBoost, einem farbbasierten Tracking mit dem CAMShift-Algorithmus sowie einer Verschleierung. Weiterhin werden Alternativmethoden, Erweiterungen und Optimierungsmöglichkeiten zur Steigerung der Robustheit und Echtzeitfähigkeit des Systems vorgestellt.

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Thürck, Daniel; Widmer, Sven; Kuijper, Arjan; Goesele, Michael

Efficient Heuristic Adaptive Quadrature on GPUs: Design and Evaluation

2014

Wyrzykowski, Roman (Ed.) et al.: Parallel Processing and Applied Mathematics : 10th International Conference 2013. Revised Selected Papers, Part I. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8384), pp. 652-662

International Conference on Parallel Processing and Applied Mathematics (PPAM) <10, 2013, Warsaw, Poland>

Numerical integration is a common sub-problem in many applications. It can be solved easily in CPU-based applications using adaptive quadrature such as the adaptive Simpson's rule. These algorithms rely, however, on error estimation yielding a significant computational overhead. In addition, they require recursive function evaluations, which are not well suited for parallel computation on graphics processing units (GPUs) due to warp divergence issues. In this paper, we introduce heuristic forward quadrature as an alternative that is not only more efficient than traditional methods, but also better suited for accelerated massively-parallel calculation on GPUs. Additionally, we will give an error estimate for our method and demonstrate performance results for 1D and 2D integral applications which show that the algorithm leverages quadrature for the efficient implementation on GPUs.

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Schiffer, Thomas; Fellner, Dieter W.

Efficient Multi-kernel Ray Tracing for GPUs

2014

Coquillart, Sabine (Ed.) et al.: GRAPP 2014 : Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications. SciTePress, 2014, pp. 209-217

International Conference on Computer Graphics Theory and Applications (GRAPP) <9, 2014, Lisbon, Portugal>

Images with high visual quality are often generated by a ray tracing algorithm. Despite its conceptual simplicity, designing an efficient mapping of ray tracing computations to massively parallel hardware architectures is a challenging task. In this paper we investigate the performance of state-of-the-art ray traversal algorithms for bounding volume hierarchies on GPUs and discuss their potentials and limitations. Based on this analysis, a novel ray traversal scheme called batch tracing is proposed. It decomposes the task into multiple kernels, each of which is designed for efficient parallel execution. Our algorithm achieves comparable performance to currently prevailing approaches and represents a promising avenue for future research.

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Efficient Self-Shadowing Using Image-Based Lighting on Glossy Surfaces

2014

Bender, Jan (Ed.) et al.: VMV 2014 : Vision, Modeling, and Visualization. Goslar: Eurographics Association, 2014, pp.159-166

Workshop on Vision, Modeling, and Visualization (VMV) <19, 2014, Darmstadt, Germany>

In this paper we present a novel natural illumination approach for real-time rasterization-based rendering with environment map-based high dynamic range lighting. Our approach allows to use all kinds of glossiness values for surfaces, ranging continuously from completely diffuse up to mirror-like glossiness. This is achieved by combining cosine-based diffuse, glossy and mirror reflection models in one single lighting model. We approximate this model by filter functions, which are applied to the environment map. This results in a fast, image-based lookup for the different glossiness values which gives our technique the high performance that is necessary for real-time rendering. In contrast to existing real-time rasterization-based natural illumination techniques, our method has the capability of handling high gloss surfaces with directional self-occlusion. While previous works exchange the environment map by virtual point light sources in the whole lighting and shadow computation, we keep the full image information of the environment map in the lighting process and only use virtual point light sources for the shadow computation. Our technique was developed for the usage in real-time virtual prototyping systems for garments since here typically a small scene is lit by a large environment which fulfills the requirements for imagebased lighting. In this application area high performance rendering techniques for dynamic scenes are essential since a physical simulation is usually running in parallel on the same machine. However, also other applications can benefit from our approach.

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Schönfelder, Tom; Urban, Bodo (Betreuer); Aehnelt, Mario (Betreuer)

Einsatz kognitiver Architekturen für die Anleitung von Montagearbeiten: Vergleichende Darstellung ausgewählter Konzepte

2014

Rostock, Univ., Studienarbeit, 2014

Die vorliegende Arbeit untersucht verschiedene Modellierungen von kognitiven Architekturen hinsichtlich ihrer Eignung als Assistenzsysteme in technischen Anwendungen. Hierbei sind eine Reihe von Kriterien zu berücksichtigen, welche je nach Anwendungsfall unterschiedlich zu bewerten sind. Dem Leser soll ein Überblick über den aktuellen Stand der Technik vermittelt werden, anhand dessen die Auswahl einer geeigneten Modellierung für einen gegebenen Anwendungsfall erleichtert werden kann. Bei den betrachteten Architekturen handelt es sich um Soar, ACT-R, ICARUS, EPIC und 4CAPS.

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Enhanced Shadow Detection for 3D Ultrasound

2014

Deserno, Thomas Martin (Ed.) et al.: Bildverarbeitung für die Medizin 2014 : Algorithmen, Systeme, Anwendungen. Proceedings des Workshops. Berlin, Heidelberg, New York: Springer, 2014. (Informatik aktuell), pp. 234-239

Workshop Bildverarbeitung für die Medizin (BVM) <17, 2014, Aachen, Germany>

Ultrasound imaging offers a fast, convenient and save instrument to conduct patient examinations for various medical scenarios. However, depending on the target region, occluding bone segments and other materials cause large and undesirable shadowing artifacts. Thus, the experience of the ultrasound operator is crucial for obtaining an ultrasound without artifacts for patient diagnosis. Even more so, when applying automated image processing algorithms. We therefore like to introduce our automatic 3D ultrasound shadow detection method that employs scan line energy and local image entropy information. Applying the method can help to prevent low quality image acquisitions with large shadowing artifacts by indicating shadow occurrences.

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Konstantinos, Votis; Karras, Yiannis; Kohlhammer, Jörn; Steiger, Martin; Tzovaras, Dimitrios; Gounopoulos, Elias

Enhanced Visual Analytics Services for the Optimal Planning of Renewable Energy Resources Installations

2014

Iliadis, Lazaros (Ed.) et al.: Artificial Intelligence Applications and Innovations : AIAI 2014 Workshops: CoPA, MHDW, IIVC, and MT4BD. Berlin, Heidelberg, New York: Springer, 2014. (IFIP Advances in Information and Communication Technology 437), pp. 330-339

International Conference on Artificial Intelligence Applications and Innovations (AIAI) <10, 2014, Rhodes, Greece>

This paper presents an integrated and novel service environment for real-time interactions between users, as well as enhanced visualization and decision support services over extremely large volumes of heterogeneous Renewable data sources. The integrated visual analytics methods, allow energy analysts to incorporate their expert knowledge into the analysis, so as to dynamically investigate the observed events and locations, and accurately identify the preferable results. The goal of visual analytics research is to turn the information overload into an opportunity by enabling decision-makers to examine this massive amount of information to make effective decisions.

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Mouton, Christophe; Parfouru, Samuel; Jeulin, Clotilde; Dutertre, Cecile; Goblet, Jean-Louis; Paviot, Thomas; Lamouri, Samir; Limper, Max; Stein, Christian; Behr, Johannes; Jung, Yvonne

Enhancing the Plant Layout Design Process using X3DOM and a Scalable Web3D Service Architecture

2014

Polys, Nicholas F. (General Chair) et al.: Proceedings Web3D 2014 : 19th International Conference on 3D Web Technology. New York: ACM, 2014, pp. 125-132

International Conference on 3D Web Technology (WEB3D) <19, 2014, Vancouver, BC, Canada>

This paper presents an innovative model-driven architecture enabling 3D web-based design processes in the field of large complex building (LBC) projects, such as power plant construction. This work was motivated by proposing new ways of achieving 3D CAD tasks not only for highly complex and temporary organization in the design stages but also for the whole lifecycle of such installations, which may last several decades. in this particular scenario, it is very important to share the right information with the right stakeholder at the right time, to maintain a high level of knowledge sharing. Taking into account these challenges, we propose a first implementation of interactive 3D CAD editing tools, based on the X3DOM technology and driven by a knowledge layer which utilizes a complete reference data and rules management system. To store the CAD models, a Macro-Parametric Approach has been investigated and a 3D server has been added to the traditional PDM (Product or Plant Data Management) to execute remotely complex CAD operations. This is a very promising start to deploy lightweight and smart web3D CAD editing services for the AEC (Architecture Engineering Construction) and power industries.

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Knaub, Anton; Drechsler, Klaus (Betreuer)

Entwicklung eines Appearance Models zur modellbasierten Lebersegmentierung in MRT-Daten

2014

Darmstadt, Hochschule, Bachelor Thesis, 2014

Der Standard der Diagnostizierung von Lebertumoren in der Radiologie ist bis heute die Computertomographie (CT). Auf Basis dieser Daten wurden zahlreiche Segmentierungsverfahren entwickelt und erfolgreich für die automatisierte Diagnose und Planung von Interventionen eingesetzt. Die Gefahr bei CT besteht darin, dass der Patient einer erhöhten Strahlungsdosis ausgesetzt wird. Dies ist einer der Gründe, weswegen die Magnetresonanztomographie (MRT) verstärkt von Radiologen zur Diagnose eingesetzt wird. Es gibt viele Ansätze zur Segmentierung von Organen wie der Leber. Besonders gute Ergebnisse wurden mit modellbasierten Ansätzen für die automatische Segmentierung der Leber in CT-Daten entwickelt. Auf den Wunsch der Radiologen soll auch eine Lebersegmentierung auf MRT-Daten ermöglicht werden. Aus diesem Grund wird in dieser Arbeit ein bestehendes modellbasierendes Verfahren, das Probabilistic Active Shape Model von Matthias Kirschner, aufgegriffen und um ein Appearance Model für MRT-Daten erweitert und somit eine Lebersegmentierung auf MRT-Daten ermöglicht. Dazu wird eine geeignete Vorverarbeitungspipeline für MRT-Lebern gewählt. Des Weiteren werden verschiedene Trainingsmethoden des Appearance Models untersucht und die geeignetste selektiert und evaluiert. Die Ergebnisse der Evaluation der Segmentierung auf acht kontrastinjizierten Lebern liefern einen durchschnittlichen Volumenüberlappungsfehler von 13,37 % bei einer durchschnittlichen Oberflächendistanz von 2,39 mm.

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Bendix, Anne; Urban, Bodo (Betreuer); Mesing, Benjamin (Betreuer)

Entwicklung eines Authoring-Ansatzes für die Anreicherung von 3D-Szenen mit Verhalten für das 3D-Web

2014

Rostock, Univ., Bachelor Thesis, 2014

Dynamische 3D-Szenen finden heutzutage in vielen Bereichen Anwendung, wie beispielsweise in der Industrie oder zu Lern- und Ausbildungszwecken. Eine statische 3D-Szene lässt sich leicht mit Hilfe von CAD-Programmen erstellen, doch das Einbringen der dynamischen Aspekte erfolgt meist von Hand und stellt eine große Hürde dar. In dieser Arbeit wird ein Konzept vorgestellt, mit welchem Verhalten in eine 3D-Szene in einem bestimmten 3DWeb-Format eingebracht werden kann. Das Konzept wird auf Basis eines bereits existierenden Datenaufbereitungsframeworks beispielhaft für X3DOM umgesetzt. Dabei wird das Framework im Hinblick auf die Anreicherung optimiert. Durch die Einführung verschiedener Abstraktionsebenen soll eine Entkoppelung vom zugrunde liegenden 3DWeb-Format erfolgen. Dadurch soll eine Unterstützung weiterer 3DWeb- Formate künftig erleichtert werden.

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Eckeren, Katharina van; Kuijper, Arjan (Betreuer); Goesele, Michael (Betreuer); Tausch, Reimar (Betreuer)

Entwicklung und Evaluation eines 3D Object Retrieval Systems für digitalisierte Kulturobjekte

2014

Darmstadt, TU, Master Thesis, 2014

Diese Arbeit befasst sich mit dem Aufbau, der Entwicklung und der Auswertung eines 3D Object Retrieval-Systems zur Ähnlichkeitssuche von digitalisierten Kulturobjekten. Nach der Einordnung und Vorstellung des verwendeten Beschreibungsverfahrens für 3D Objekte, namens 3D Histogram of Oriented Gradients (Abk. 3D-HOG) [1][2], in den Kontext des aktuellen State-of-the-Art erfolgt eine Erläuterung jeder verwendeten Komponente des Systems. Neben der ausführlichen Erklärung der Funktionsweise von 3D-HOG und seinen Stärken und Schwächen wurde für seine Auswertung eine Datengrundlage, bestehend aus 3D Kulturobjekten mit einer sehr hohen Polygonnetzauflösung, erstellt. Die Auswertung betrachtet verschiedene Parameterangaben und benutzt zur anfänglichen Bewertung das Maß der R-Precision [3]. Durch die Anpassung der Blocknormalisierung, der Zellenanzahl und der Gradientenfeldgröße, die drei wichtigsten Parameter des 3D-HOG Verfahrens, konnte die R-Precision von 0.799 auf 0.888 verbessert werden. Außerdem zeigte sich, dass die Polygonnetzauflösung der Objekte von sekundärer Bedeutung ist, da sie kaum einen Einfluss auf die Ergebnisse der gewählten Beschreibungsverfahren hat.

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Krause, Tom; Lukas, Uwe von (Betreuer); Vahl, Matthias (Betreuer); Gutzeit, Enrico (Betreuer)

Ereignisdetektion in Bildfolgen

2014

Rostock, Univ., Diplomarbeit, 2014

Diese Diplomarbeit behandelt die Ereigniserkennung in Bildfolgen. Dabei soll der Anwendungsfall "Ereignisdetektion in an Bord von Fischereifahrzeugen aufgenommenen Überwachungsvideos" adressiert werden. Nach einem Überblick über die Grundlagen werden Konzeption und Umsetzung eines Systems erläutert, welches die Ereigniserkennung erleichtern soll. Bedingt durch den Anwendungsfall wird dabei vermehrt auf die Erkennung von Meerwasser eingegangen, welches einen wichtigen Kontext für viele Ereignisse da stellt.

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Wuhrer, Stefanie; Pishchulin, Leonid; Brunton, Alan; Shu, Chang; Lang, Jochen

Estimation of Human Body Shape and Posture Under Clothing

2014

Computer Vision and Image Understanding, Vol.127 (2014), pp. 31-42

Estimating the body shape and posture of a dressed human subject in motion represented as a sequence of (possibly incomplete) 3D meshes is important for virtual change rooms and security. To solve this problem, statistical shape spaces encoding human body shape and posture variations are commonly used to constrain the search space for the shape estimate. In this work, we propose a novel method that uses a posture-invariant shape space to model body shape variation combined with a skeleton-based deformation to model posture variation. Our method can estimate the body shape and posture of both static scans and motion sequences of human body scans with clothing that fits relatively closely to the body. In case of motion sequences, our method takes advantage of motion cues to solve for a single body shape estimate along with a sequence of posture estimates. We apply our approach to both static scans and motion sequences and demonstrate that using our method, higher fitting accuracy is achieved than when using a variant of the popular SCAPE model [2, 18] as statistical model.

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Carr, Hamish; Rheingans, Penny; Schumann, Heidrun

EuroVis 2014. Eurographics Conference on Visualization 2014

2014

Eurographics Conference on Visualization (EuroVis) <16, 2014, Swansea, Wales, UK>

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Bienert, Andreas; Santos, Pedro; Hemsley, James

EVA 2014 Berlin. Proceedings: Elektronische Medien & Kunst, Kultur, Historie

2014

Electronic Imaging & the Visual Arts (EVA) <21, 2014, Berlin, Germany>

In den Workshops zum 3D-Scanning von historischem Kulturgut werden die technischen und semantischen Themenbereiche von der Datenakquise bis hin zur Visualisierung aufgefächert und zur Diskussion gestellt. Erstmals wird die Möglichkeit geboten, CultLab3D, ein mobiles 3D-Scanning Szenario für Museen und Galerien, im konkreten Arbeitszusammenhang zu erproben. Unter dem Titel "Attention! Wahrnehmung und Vermittlung in der digitalen Gesellschaft" widmet sich ein dritter Workshop den Auswirkungen, die sich aus 3D-Modellen, immersiven Bildwelten und Augmented Reality Anwendungen für unsere Wahrnehmung und das kollektive Bewusstsein einstellen. Sie verändern den Horizont unserer Erfahrungen und die Art und Weise, wie wir Geschichte/n weitergeben. An den beiden Konferenztagen wird das Thema der digitalen Modellbildung dann für die unterschiedlichen Einsatzbereiche fortgeführt. Das Spektrum reicht von der 3D-Visualisierung über die Organisation von Wissen in Portalen, in Datenverbünden und in Netzwerken bis hin zu technologisch innovativen Präsentationsformaten und neuen Möglichkeiten der Besucherbindung.

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Hänler, Anna; Gutzeit, Enrico; Mertins, Alfred

Evaluation of Methods for Automatic Fish Segmentation

2014

Buzug, Thorsten M. (Ed.) et al.: Student Conference on Medical Engineering Science 2014. Proceedings. München: Grin Verlag, 2014, pp. 175-178

Student Conference on Medical Engineering Science <3, 2014, Lübeck, Germany>

Bycatch in the fishery endangers whole ecological systems in worldwide waters. By identifying and counting the marine animals of the bycatch, fishing techniques could be improved which would reduce the bycatch in turn. To ensure good identification, an excellent segmentation of the fish in photos taken from the bycatch is important. Six different segmentation methods are tested, which are Otsu's method, the Watershed algorithm, Region Growing, K-Means, K-Means distance probability and Gaussian Mixture Models (GMM) distance probability, with the two latter ones calculating probabilities for each pixel of an image for belonging to the fore- or the background. The methods are compared with the F-Measurement, the harmonic mean of precision and recall, to evaluate their accuracy. The result of this work will show that the best method for the seven tested fish species is the automatic K-Means algorithm, which is easy to use in practice.

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Steiger, Martin; Hutter, Marco; Schader, Philipp; Kohlhammer, Jörn; Kuijper, Arjan

Exploring Simulation in Sensor Network Models

2014

Bender, Jan (Ed.) et al.: VMV 2014 : Vision, Modeling, and Visualization. Goslar: Eurographics Association, 2014, pp. 135-142

Workshop on Vision, Modeling, and Visualization (VMV) <19, 2014, Darmstadt, Germany>

Simulation is an important measure to estimate different properties of a planned network such as throughput and cost. However, many parameters need to be adjusted to approximate real-world conditions properly. In this paper we present a visualization system that visually supports and guides the analysis of (physical) network simulation problems. Automatic optimizers run as a black box giving an (locally) optimal result in terms of the underlying simulation model and parameter configuration. This is often not ideal for practical usage. Our system assists the user in the process of comparing different simulations to quickly achieve the optimal configuration in terms of user preference. It highlights differences between simulation runs and indicates which parameter modification leads to the best improvement. We expect that this results in large time savings for the domain expert while configuring the simulation system.

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Krispel, Ulrich; Ullrich, Torsten; Fellner, Dieter W.

Fast and Exact Plane-based Representation for Polygonal Meshes

2014

Blashki, Katherine (Ed.) et al.: Proceedings of the International Conferences on Interfaces and Human Computer Interaction 2014, Game and Entertainment Technologies 2014 and Computer Graphics, Visualization, Computer Vision and Image Processing 2014 : Part of the Multi Conference on Computer Science and Information Systems, MCCSIS 2014. IADIS Press, 2014, pp. 189-196

IADIS International Conference Computer Graphics, Visualization, Computer Vision and Image Processing (CGVCVIP) <8, 2014, Lisbon, Portugal>

Boolean operations on meshes tend to be non-robust, due to the rounding of newly constructed vertex coordinates. Plane-based mesh representations are known to circumvent the problem for meshes with planar faces: geometric information is stored by face equations, and vertices (as well as newly constructed vertices) are expressed as plane triplets. We first review the properties of plane-based mesh representations and discuss a variant that is optimized for fast evaluation using fixed integer precision and give some practical insights on implementing search structures for indexing of planes and vertices in this representation.

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Wesarg, Stefan; Wichmann, Julian L.; Booz, Christian; Erdt, Marius; Kafchitsas, Konstantinos; Khan, M. Fawad

First Clinical Experience with BMD Assessment in Vertebrae Using Dual-Energy CT

2014

Erdt, Marius (Ed.) et al.: Clinical Image-Based Procedures. Translational Research in Medical Imaging : Second International Workshop, CLIP 2013. Held in Conjunction with MICCAI 2013. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8361), pp. 151-159

International Workshop on Clinical Image-based Procedures (CLIP) <2, 2013, Nagoya, Japan>

Dual-energy CT (DECT) can be performed with state-of-the- art dual-source CT (DSCT) scanners and allows for assessing bone mineral density (BMD). In this work, we present first clinical experience with in vivo BMD assessment of vertebrae based on DECT data which has been acquired with a state-of-the-art DSCT scanner in the clinical routine. In contrast to previous work where we did in vitro tests of our method, we apply it her for the first time to in vivo data and prove the feasibility of our technique in a clinical setting. For 25 patients, DXA as well as DECT data have been acquired and BMD of vertebrae was assessed. Advantages of DECT are its 3D capabilities allowing to compute the spatial BMD distribution and to focus the examination on the trabecular bone. Correlations between both imaging techniques regarding the averaged BMD values per vertebra are only moderate.

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Follow-Me: Smartwatch Assistance on the Shop Floor

2014

Nah, Fiona Fui-Hoon (Ed.): HCI in Business : HCIB 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8527), pp. 279-287

International Conference on Human-Computer Interaction in Business (HCIB) <1, 2014, Heraklion, Crete, Greece>

The growing complexity of manufacturing calls for new approaches to support the human workforce with situation-aware information and tools which in consequence ease the process of understanding and applying work related knowledge. With this paper we introduce a theoretical model for a systematic information transfer between assistance system and worker. It defines assistance objectives and reviews the role of artifacts during the assistance process focusing on the cognitive aspects of work. Our approach was implemented using smartwatches for application in industrial assembly environments extending the Plant@Hand manufacturing performance support system.

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Ladenhauf, Daniel; Berndt, Rene; Eggeling, Eva; Ullrich, Torsten; Battisti, Kurt; Gratzl-Michlmair, Markus

From Building Information Models to Simplified Geometries for Energy Performance Simulation

2014

Lazarevic, Eva Vanista (Ed.) et al.: Proceedings of International Academic Conference on Places and Technologies : Keeping up with Technologies to Improve Places [online]. [cited 16 December 2014] Available from: http://placesandtechnologies.eu/about.html: University of Belgrade, 2014, pp. 669-676

International Academic Conference on Places and Technologies <1, 2014, Belgrade, Serbia>

A major future challenge in the building industry is to reduce primary energy use of buildings. EU law now requires energy performance certificates to be issued for all buildings. Hence, energy performance simulation becomes an increasingly important topic. Accurate, yet efficient simulation depends on simple building models. Most of the required data can be found in Building Information Models (BIM), following the buildingSMART alliance's Industry Foundation Classes (IFC) schema. IFC has become an ISO standard and enjoys increasing support by CAD software. However, typical IFC models contain a lot of irrelevant data, in particular geometric representations, which are too detailed for energy performance simulation. Therefore, an algorithm is proposed for extracting input models for simulations directly from IFC models in a semi-automatic process, to overcome the current situation where simple models are manually built from scratch. The key aspect of the algorithm is geometry simplification subject to semantic and functional groups; more specifically, the 3D representations of walls, slabs, windows, doors, etc. are reduced to a collection of surfaces describing the building's thermal shell on one hand, and the material layers associated with it on the other hand. Test models from simple fictitious houses to complex models of real-world buildings have been provided to guide the development of the algorithm in an incremental manner. This paper presents the resulting algorithm and the current status of prototype software implementing it.

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From Raw Data to Rich Visualization: Combining Visual Search with Data Analysis

2014

Wahlster, Wolfgang (Ed.) et al.: Towards the Internet of Services: The THESEUS Research Program. Berlin, Heidelberg, New York: Springer, 2014. (Cognitive Technologies), pp. 203-209

Visual analytics is an interdisciplinary field of research at the boundary between data mining, statistics and visualization. Patterns and relations in the data complement a semantic representation of knowledge on a lower level of abstraction. One important goal of visual analytics is to find relations hidden in vast amounts of data, which can be turned into useful knowledge. Analysis needs to be "visual", because human's visual cognitive abilities are important for the identification and refinement of the analytical process. Further the results of the analysis have to be presented in a way to match the user's perspective on the proposed task. However, typical users are not experts in statistics or data mining. The challenge of visual analytics is to keep domain experts in charge of the analytical process while reducing the workload due to the complexity of the techniques. While search and analysis usually arc mentioned in different contexts, they are highly interdependent processes. In fact, every exploratory analysis is a search for new knowledge. In turn, this knowledge can be used to refine future searches by introducing new concepts or relations to draw from. This article will show how automated and visual methods can be combined to connect knowledge artifacts on multiple levels of abstraction.

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Fundamental Aspects for E-Government

2014

Sonntagbauer, Peter et al.: Handbook of Research on Advanced ICT Integration for Governance and Policy Modeling. Hershey, Pennsylvania: IGI Global, 2014, pp. 1-18

The upcoming initiatives using ICT in the government process should strengthen the benefit of E-Government in most countries. Since E-Government among other e-related terms is a widely (interpreted) term, it is sometimes challenging to understand the objective and goals of an initiative. Therefore in this paper we introduce and explain the most E-Government related terms. Even more, we outline some interesting initiatives and implementations to explain the benefits of using ICT in the government domain. So next to the term description, concrete activities will be aligned to the terms to explain the practical use in a better way. We conclude with several challenges that arise when thinking of the implementation of E-Government services. Overall this chapter should give a good overall view about E-Government and the relating issues.

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Sonntagbauer, Susanne; Sonntagbauer, Peter; Nazemi, Kawa; Burkhardt, Dirk

The FUPOL Policy Lifecycle

2014

Sonntagbauer, Peter et al.: Handbook of Research on Advanced ICT Integration for Governance and Policy Modeling. Hershey, Pennsylvania: IGI Global, 2014, pp. 61-87

The purpose of this chapter is to outline an advanced policy lifecycle, the FUPOL model with its ability to link technical features in the area of policy modeling. The FUPOL Policy Lifecycle is based on six stages, which are further divided into ten main tasks. These main tasks are split up into eighteen subtasks to provide a very detailed policy lifecycle structure. The detailed breakdown allows to link each task to various technical features, such as opinion maps, policy indicator dashboard, knowledge data base, simulation and visualization tools. It is further argued that the methodology applied is future proof and has the potential of accommodating new technologies in the future.

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Ginters, Egils; Aizstrauts, Artis; Baltruks, Mikelis; Nazemi, Kawa; Burkhardt, Dirk; Sonntagbauer, Peter; Sonntagbauer, Susanne; Gutierrez, Jorge Martin

Fupol Simulators and Advanced Visualization Framework Integration

2014

Affenzeller, Michael (Ed.) et al.: 26th European Modeling and Simulation Symposium : EMSS 2014. Italy: CAL-TEK S.r.l., 2014, pp. 523-529

European Modeling and Simulation Symposium (EMSS) <26, 2014, Bordeaux, France>

FP7 FUPOL project No.287119 (see www.fupol.eu) aims at a new approach to traditional politics modeling. The FUPOL will be able to automatically collect, analyze and interpret opinions expressed on a large scale from the Internet and social networks. This will enable governments to gain a better understanding of the needs of citizens. Likewise the software will have the capabilities to simulate the effects of policies and laws and to assist governments in the whole policy design process. Basic visualization of the simulation results are supported by the simulators however visualization facilities are limited, therefore for detailed visual analysis of simulation data SemasVis environment is used.

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Fusing Web Technologies & Augmented Reality

2014

Julier, Simon (Ed.) et al.: IEEE International Symposium on Mixed and Augmented Reality - Science & Technology 2014 : ISMAR 2014. Piscataway, NJ: IEEE Service Center, 2014, 1 p.

IEEE International Symposium on Mixed and Augmented Reality (ISMAR) <13, 2014, Munich, Germany>

Within the German research project ARVIDA a large consortium of industrial Virtual and Augmented Reality users, of technology providing companies and research institutes cooperate on the establishment of highly flexible web-based reference architecture for Augmented Reality applications. The use of web technologies is motivated by modern web standards as WebGL or WebRTC supporting e.g. real time rendering of 3D-content of video streaming within Web-Browsers. Thereby, the use of Web technologies not only offers the possibility to develop applications platform and OS independent but it also facilitates the integration of Augmented Reality into industrial workflows or PDM environments. The developed reference architecture offers RESTful tracking, rendering and interaction services that foster the combination and exchange of different algorithms with the aim to fit the technology to the specific requirements of an AR-applications in an optimal way.

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Preiss, Jens; Fairchild, Mark D.; Ferwerda, James A.; Urban, Philipp

Gamut Mapping in a High-Dynamic-Range Color Space

2014

Eschbach, Reiner (Ed.) et al.: Color Imaging XIX: Displaying, Processing, Hardcopy, and Applications. Bellingham: SPIE Press, 2014. (Proceedings of SPIE 9015), pp. 90150A-1 - 90150A-7

Color Imaging: Processing, Hardcopy, and Applications <19, 2014, San Francisco, CA, USA>

In this paper, we present a novel approach of tone mapping as gamut mapping in a high-dynamic-range (HDR) color space. High- and low-dynamic-range (LDR) images as well as device gamut boundaries can simultaneously be represented within such a color space. This enables a unified transformation of the HDR image into the gamut of an output device (in this paper called HDR gamut mapping). An additional aim of this paper is to investigate the suitability of a specific HDR color space to serve as a working color space for the proposed HDR gamut mapping. For the HDR gamut mapping, we use a recent approach that iteratively minimizes an image-difference metric subject to in-gamut images. A psychophysical experiment on an HDR display shows that the standard reproduction workflow of two subsequent transformations - tone mapping and then gamut mapping - may be improved by HDR gamut mapping.

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GCH 2014: Eurographics Workshop on Graphics and Cultural Heritage

2014

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

Focus of this year's forum is to present and showcase new developments within the overall process chain, from data acquisition, 3D documentation, analysis and synthesis, semantical modelling, data management, to the point of virtual museums or new forms of interactive presentations and 3D printing solutions. GCH 2014 therefore provides scientists, engineers and CH managers a possibility to discuss new ICT technologies applied to data modelling, reconstruction and processing, digital libraries, virtual museums, interactive environments and applications for CH, ontologies and semantic processing, management and archiving, standards and documentation, as well as its transfer into practice.

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GCH 2014. Short Papers - Posters: Eurographics Workshop on Graphics and Cultural Heritage

2014

Eurographics Symposium on Graphics and Cultural Heritage (GCH) <12, 2014, Darmstadt, Germany>

Focus of this year's forum is to present and showcase new developments within the overall process chain, from data acquisition, 3D documentation, analysis and synthesis, semantical modelling, data management, to the point of virtual museums or new forms of interactive presentations and 3D printing solutions. GCH 2014 therefore provides scientists, engineers and CH managers a possibility to discuss new ICT technologies applied to data modelling, reconstruction and processing, digital libraries, virtual museums, interactive environments and applications for CH, ontologies and semantic processing, management and archiving, standards and documentation, as well as its transfer into practice. Short papers present preliminary results and work-in-progress or focusing on on-going projects, the description of project organization, use of technology, and lesson learned.

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Dreißig, Martin; Deistung, Eik (Betreuer)

Generative Schiffsmodellierung

2014

Wismar, Hochschule, Master Thesis, 2014

Die dreidimensionale Modellierung ist ein sehr verbreitetes Werkzeug um mediale Inhalte zu schaffen. Es wird in vielen verschiedenen Bereichen, wie z.B. der Spiele und Nachrichtenbranche genutzt, um 3D-Objekte und -Szenen zu generieren. Ziel dieser 3D-Graffiken ist es, dem Betrachter Informationen anschaulicher übermitteln zu können - durch beispielsweise Inszenierungen von Zukunftsvisionen, dreidimensionaler Diagrammen oder Trainingssimulationen. Ziel dieser Thesis soll es sein, ein möglichst realistisches Schiffsmodell mit einer nicht herkömmlichen Methodik zu erstellen: der generativen Modellierung. Der größte Unterschied zu konventionellen Modellierungsmethoden besteht darin, dass nicht das fertige Modell, sondern der Prozess zum Modell im Fokus steht. Die genutzte Programmiersprache GML ermöglicht es daher in die Prozesse einzugreifen und theoretisch unendlich viele Variationen der Objekte mit geringem Aufwand zu erstellen. Anhand der Vorlage eines realen Schiffes wurde diese Aufgabe umgesetzt und auf den Einsatz im übergeordneten Projekt MarOpTra-3D geprüft.

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Ladenhauf, Daniel; Berndt, Rene; Krispel, Ulrich; Eggeling, Eva; Ullrich, Torsten; Battisti, Kurt; Gratzl-Michlmair, Markus

Geometry Simplification According to Semantic Constraints: Enabling Energy Analysis Based on Building Information Models

2014

Computer Science - Research and Development, (2014), Online first: November 2014

The building industry and facility management is in a state of upheaval: The complexity of the realworld is now represented in its digital counterpart. The established object-based file format "Industrial Foundation Classes (IFC)" developed by the International Alliance for Interoperability facilitates interoperability in the context of Building Information Modeling. Unfortunately, there is no feasible workflow for filtering energy-related information, e.g. a streamlined version of the building geometry. Simplification methods often fail on CAD data that is ignorant of domain specific semantic information (i.e. functional differences between a door and stucco are not reflected in the geometry and are therefore often ignored). With EU law now requiring energy performance certificates to be issued for all buildings, energy performance analysis becomes an increasingly important topic. Accurate, yet efficient calculation depends on simple building models. However, typical IFC models contain a lot of irrelevant data, in particular geometric representations, which are too detailed for energy performance analysis. Therefore, we propose an algorithm that extracts input models suitable for calculations directly from IFC models in a semi-automatic process. The key aspect of the algorithm is geometry simplification subject to semantic and functional groups; more specifically, the 3D representations of walls, slabs, windows, doors, etc. are reduced to a collection of surfaces describing the building's thermal shell on one hand, and the material layers associated with it on the other hand. This simplification takes into account semantic constraints and expert knowledge. Furthermore, it works on "real-world" data; i.e. it is robust towards incomplete, imperfect and inconsistent data.

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Melzer, Marianne; Damer, Naser (Betreuer)

Gesichtserkennungssoftware in Bildarchiven - Eine Untersuchung zur Nutzung von Gesichtserkennungsprogrammen für die archivische Kernaufgabe "Erschließung"

2014

Potsdam, FH, Bachelor Thesis, 2014

Diese Arbeit betrachtet zunächst die theoretischen Grundlagen für die Gesichtserkennung. Das sind zum einen Erklärungen zur Archivale Foto, auch unter dem Aspekt der Fotoarchivierung und der archivischen Erschließung und die Biometrie bzw. Biometrik. Zum anderen ist es der Ablauf der Gesichtserkennung sowie die Algorithmen, welche häufig Anwendung hierbei finden. Mit Hilfe dieser Informationen werden verschiedene Softwareprogramme einer Untersuchung, die vorab ausführlich erläutert wird, zur Nutzung von Gesichtserkennungsprogrammen für die archivische Kernaufgabe "Erschließung" unterzogen. Die Ergebnisse dieser Untersuchung sollen aufzeigen, ob und inwiefern Gesichtserkennungsprogramme eine qualitative und quantitative Verbesserung in Bezug auf die Datensicherung (Personennennung) und Vereinfachung der Erschließung in Bildarchiven erzielen könnten. Eine Empfehlung resp. ein Ausblick zu diesem Thema vollenden die Arbeit.

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Gäde, Michael; Bieber, Gerald (Betreuer); Urban, Bodo (Betreuer)

Gestenerkennung auf Smartwatches

2014

Rostock, Univ., Studienarbeit, 2014

Virtual Environment und Smart Homes ermöglichen eine komfortable Privatsphäre. Per Fernsteuerung lassen sich Fenster öffnen, Licht an- und ausschalten, oder Zimmertemperaturen regeln. Zur bequemen und natürlichen Bedienung dieser eignen sich Sprache oder Gesten. Diese Literaturarbeit befasst sich mit den gängigen Methoden und Techniken, Handgesten zu erkennen und zu klassifizieren. Es werden einige bereits verfügbare Systeme erläutert, wozu vor allem visuelle und beschleunigungs-basierte zählen. Im Anschluss werden einige Einsatzgebiete für eine Gestensteuerung beschrieben, wobei hier der Fokus auf beschleunigungs-basierter Sensorik am Handgelenk liegt.

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Gäde, Michael; Urban, Bodo (Betreuer); Bieber, Gerald (Betreuer)

Gestenerkennung auf Smartwatches

2014

Rostock, Univ., Bachelor Thesis, 2014

Virtual Environment und Smart Homes ermöglichen eine alternative Interaktion mit der Umgebung. Per Fernsteuerung lassen sich Fenster öffnen, Licht an- und ausschalten, oder Zimmertemperaturen regeln. Zur bequemen und natürlichen Bedienung einer solchen Steuerung eignen sich Sprache oder Gesten. Diese Bachelorarbeit befasst sich mit den gängigen Methoden und Techniken, Handgesten zu erkennen und zu klassifizieren wobei hier der Fokus auf beschleunigungs-basierter Sensorik am Handgelenk liegt. Es wird eine Gestenerkennung mit einer Smartwatch konzipiert, umgesetzt und evaluiert. Des Weiteren wird die Tauglichkeit einer permanent aktiven Erkennung überprüft.

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Zeiß, Steeven; Marinc, Alexander; Braun, Andreas; Große-Puppendahl, Tobias; Beck, Sebastian

A Gesture-Based Door Control Using Capacitive Sensors

2014

Streitz, Norbert (Ed.) et al.: Distributed, Ambient, and Pervasive Interactions : DAPI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8530), pp. 207-216

International Conference on Distributed, Ambient and Pervasive Interactions (DAPI) <2, 2014, Heraklion, Crete, Greece>

In public places sanitary conditions are always of concern, particularly of surfaces that are touched by a multitude of persons, such as door handles in rest rooms. Similar issues also arise in medical facilities. Doors that open based on presence are common in environments such as shopping malls; however they are not suited for sensitive areas, such as toilet stalls. Capacitive proximity sensors detect the presence of the human body over a distance and can be unobtrusively applied in order to enable hidden gesture-based interfaces that work without touch. In this paper we present a concept for a gesture controlled automated door based on this sensor technology. We introduce the underlying technology and present the concept and electronic components used in detail. Novel interaction patterns and data processing methods allow to open, close, lock and unlock the door using simple gestures. A prototype device has been created and evaluated in a user study.

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Hadlak, Steffen; Schumann, Heidrun (Betreuer); Urban, Bodo (Betreuer); Kerren, Andreas (Betreuer)

Graph Visualization in Space and Time

2014

Rostock, Univ., Diss., 2014

The visual analysis of graphs plays an important role in many fields and includes a diversity of aspects such as the graphs' structure and associated attributes in their spatial and temporal context. Because of their increasing size, their visualization becomes more and more difficult and necessitates a multitude of different visualization techniques. This problem becomes even more severe as with a changing analysis focus on the graph, the analyst needs to flexibly switch between different visualizations at any time. This thesis aims at solving these three challenges. First, the handling of the diversity and emerging problems are discussed exemplary for two approaches each providing a multitude of differently suited tree visualizations. Here, a family of point-based tree layouts is introduced that consists of layouts with a similar layout scheme. And an implicit tree visualization design space is derived by identifying common design decisions. For a scalable analysis of large graphs, new reduction approaches are introduced. These approached are based on the one hand on clustering techniques abstracting either the structural or temporal aspect of the graphs. And on the other hand they rely on Degree-of-Interest functions to discern interesting nodes, edges and time points. Finally, to bring the different visualizations together and thus allow a flexible analysis, novel approaches for their combination and synchronization are introduced. These approaches include the in situ visualization that is based on portals to allow a local combination of visualizations and a novel abstract overview of all aspect allowing the synchronization of multiple visualizations.

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Fietkau, Julian; Urban, Bodo (Betreuer)

Grundlagen von subjektiven Videoqualitätstests: Literaturarbeit

2014

Rostock, Univ., Studienarbeit, 2014

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Hilpert, Julia; Jung, Florian (Betreuer)

Halbautomatische Segmentierung von Lymphknoten aus Magnetresonanztomographiedaten des Kopf- und Halsbereichs

2014

Mannheim, Hochschule, Bachelor Thesis, 2014

Die Größe und das Aussehen von Lymphknoten kann bei Krebspatienten Aufschluss über die Streuung eines Tumors geben. Deshalb ist ihre Vermessung bei der Behandlung sowie Nachsorge von großer Bedeutung. Der erste Schritt ist hierbei die Segmentierung der Lymphknoten. Bisher sind jedoch nur wenige Ansätze zur automatisierten Segmentierung von Lymphknoten auf MRT-Daten bekannt. In dieser Arbeit wird deshalb ein Verfahren vorgestellt, welches Lymphknoten aus MRT-Daten des Kopf- und Halsbereichs segmentiert. Diese Segmentierung findet mit minimaler Nutzerinteraktion, nur durch Setzen eines Punktes innerhalb des Lymphknotengewebes, statt. Die Hauptkomponente der gewählten Methode zur Segmentierung ist eine Wasserscheidentransformation, die das Bild über seine Gradienten in verschiedene Segmente einteilt. Mittels eines Radialstrahlverfahrens wird zusätzlich die Oberfläche des Lymphknotens angenähert. Diese Oberfläche dient nach weiteren, untergeordneten Verarbeitungsschritten dazu, aus der Menge der Bildsegmente jene auszuwählen, die den Lymphknoten repräsentieren. Evaluiert wurde das entwickelte Verfahren an 95 Lymphknoten aus 17 verschiedenen, T1- gewichteten MRT-Datensätzen. Es ergab sich ein durchschnittlicher Dice Similarity Coefficient von 0,69±0,15. Auf dem Weg zu einer vollautomatischen Segmentierung von Lymphknoten stellt das entwickelte Verfahren somit einen vielversprechenden ersten Schritt dar.

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Sonntagbauer, Peter; Nazemi, Kawa; Sonntagbauer, Susanne; Burkhardt, Dirk

Handbook of Research on Advanced ICT Integration for Governance and Policy Modeling

2014

As governments and policy makers take advantage of information and communication technologies, leaders must understand how to navigate the ever-shifting landscape of modern technologies in order to be most effective in enacting change and leading their constituents. Advanced ICT Integration for Governance and Policy Modeling builds on the available literature, research, and recent advances in e-governance to explore advanced methods and applications of digital tools in government. This collection of the latest research in the field presents an essential reference for academics, researchers, and advanced-level students, as well as government leaders, policy makers, and experts in international relations.

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Helper Data Scheme for 2D Cancelable Face Recognition Using Bloom Filters

2014

Mustra, Mario (Ed.) et al.: IWSSIP 2014. Proceedings : 21st International Conference on Systems, Signals and Image Processing. Zagreb: Faculty of Electrical Engineering and Computing, University of Zagreb, 2014, pp. 271-274

International Conference on Systems, Signals and Image Processing (IWSSIP) <21, 2014, Dubrovnik, Croatia>

Biometrics provide a source of automated recognition of individuals based on their physiological and behavioral characteristics. As per Directive 95/46/EC, biometric data is considered to be personal data. And according to article 8 of the European Convention on Human Rights, personal data needs to be privacy preserved. Biometric template protection mechanisms provide a privacy preserved biometric authentication. Such mechanisms assist irreversibility, revocability and unlinkability of biometric templates. Recently, a bloom filter based approach was proposed to generate irreversible iris template. In this paper, a helper data scheme for 2D cancelable face verification using bloom filters is proposed. The positions of most representative features (stable features) are used as helper data, which helps in the face recognition. The features used are extracted using Local Binary Linear Discriminant Analysis. The effect of stable features on recognition performance under scenarios of with and without using bloom filters is investigated. In addition, recognition performance after compressing multiple features into a single bloom filter is presented. The results are experimentally proved on two benchmark databases namely LFW and ORL datasets.

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Yoon, Sang Min; Graf, Holger; Kuijper, Arjan

Hierarchical Image Representation using 3D Camera Geometry for Content-based Image Retrieval

2014

Engineering Applications of Artificial Intelligence, Vol.30 (2014), pp. 235-241

In this paper we present a hierarchical image representation methodology by clustering images with 3D camera geometry in order to efficiently retrieve the images according to user's viewpoint. The framework of our proposed technique is composed of two steps: first the visual correlation analysis between images in a large database is determined by the estimated 3D camera geometry and second images are classified using a constrained agglomerative hierarchical image clustering method to retrieve the images the users search. The constrained agglomerative hierarchical image clustering method provides balanced hierarchical layers, independent of the number of images within the cluster. It also provides a convenient way to browsing, navigating, and categorizing of the images with various viewpoints, illumination, and partial occlusion.

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Förster, Tim; Thum, Simon (Betreuer); Kuijper, Arjan (Betreuer)

Hochverfügbarkeit (Analytisch) von Big-Geo-Data als Platform as a Service

2014

Darmstadt, TU, Bachelor Thesis, 2014

Es gibt stetig wachsende Herausforderungen in der Entwicklung von Geodaten. Die Datenzunahme steigt kontinuierlich. Durch den starken Anstieg dieser Informationsansammlungen wird immer mehr Datenspeicher benötigt. Des Weiteren sollen die Systeme eine hohe Verfügbarkeit aufweisen und unter Last eine akzeptable Reaktionszeit liefern. Die Erfüllung solcher Anforderung lassen sich nur begrenzt mit einem einfachen Client/Server-System realisieren, da diese nicht gut skalieren und unter schlechten Bedingungen langsam agieren. Daher werden immer mehr Applikationen in der Cloud als Service bereitgestellt. Dies bringt viele Vorteile; unter anderem die Verbesserung der Verfügbar- und Skalierbarkeit des Services. In dieser Arbeit wird anhand eines existierenden Server-Systems die Designentscheidungen gezeigt, die für eine Realisierung des Produktes in der Cloud notwendig sind. Dieses Produkt wird dann als "Platform as a Service" bereitgestellt. Dabei werden Punkte wie, Persistierung im verteilten System und Cloud-API Gestaltung besprochen. Anschließend wird dies in einem verteilten System getestet und gegenüber ein einfaches Client/Server-System verglichen. Ebenfalls wird ein Model vorgestellt, womit die Verfügbarkeit des Systems kalkuliert wird.