Liste der Fachpublikationen

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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, René; 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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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. 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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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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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, René; 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.