Acceleration of 3D Mass Digitization Processes: Recent Advances and Challenges
Mixed Reality and Gamification for Cultural Heritage
In the heritage field, the demand for fast and efficient 3D digitization technologies for historic remains is increasing. Besides, 3D has proven to be a promising approach to enable precise reconstructions of cultural heritage objects. Even though 3D technologies and postprocessing tools are widespread and approaches to semantic enrichment and Storage of 3D models are just emerging, only few approaches enable mass capture and computation of 3D virtual models from zoological and archeological findings. To illustrate how future 3D mass digitization systems may look like, we introduce CultLab3D, a recent approach to 3D mass digitization, annotation, and archival storage by the Competence Center for Cultural Heritage Digitization at the Fraunhofer Institute for Computer Graphics Research IGD. CultLab3D can be regarded as one of the first feasible approaches worldwide to enable fast, efficient, and cost-effective 3D digitization. lt specifically designed to automate the entire process and thus allows to scan and archive large amounts of heritage objects for documentation and preservation in the best possible quality, taking advantage of integrated 30 visualization and annotation within regular Web browsers using technologies such as WebGI and X3D.
Design, Construction and Programming of an Automated Positioning Platform for the Calibration of Imaging Systems
Darmstadt, TU, Bachelor Thesis, 2016
For the intrinsic and color calibration of large-scale photogrammetric 3D scanners no fully-automated process is yet available. This work intends to lay the foundations to address this issue. During the course of this work the development of a new positioning system from scratch is performed. The development is based on a set of specifications which are assessed first. This assessment is following a standardized process model used in product development. The final goal being the positioning of several calibration patterns differing in type and use. The patterns used are precisely printed and produced in high quality. By acquiring several images of these patterns, it is possible to calibrate the cameras used in photogrammetric 3D scanners. Shortcomings regarding the time-consumption and inaccurate results of the manual calibration process motivated the development of a partly automated process. It is the aim of this work to create a positioning system, controllable by a graphical user interface (GUI). The GUI needs to be programmed as part of this project and allows the user to directly control the platform with direct transformation, often referred to as forward kinematics. This enables the possibility of placing the end effector along the optical axes of the image sensors that have to be calibrated. The considered test-cases involve the execution of pre-defined joint configurations and trajectories. At the same time basic safety mechanisms for the detection and prevention of deviations and collisions are implemented. A primary focus is on the movement of the end effector which is also constructed as part of this work and is independent of the positioning of the end point. Turning, tilting and translating relative to the optical axis of the respective imaging system is achieved. This is done with the help of a delta kinematic. The constraints in manufacturing are taken into account during the iterative refining process of the connecting and bearing parts. Among others the emerging generative manufacturing process Fused Deposition Modeling is applied as a rapid prototyping process.
CultLab3D - On the Verge of 3D Mass Digitization
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.