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IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Wolfgang Büschel Katja Krug Marc Satkowski Stefan Gumhold Raimund Dachselt Interactive Media Lab Dresden TUD Dresden University of Technology Chair of Computer Graphics and Visualization TUD Dresden University of Technology

ISBN: (数字)9798331506919

ISBN: (纸本)9798331506926

In this paper, we present a research platform to support studying collaboration in hybrid and co-located scenarios. Mixed-presence collaboration includes various novel and exciting use cases, such as situated and immersive data analysis by multiple users. However, research in this emerging field is hindered by the technical complexity of the setups and often requires re-implementation of common features. We address this issue by contributing a toolkit and research platform for mixed-presence collaboration that serves as an extensible baseline implementation and enables fast prototyping for user studies in collaborative mixed reality. Furthermore, our platform provides adjustable parameters, such as types of avatars, audio source placement, or the amount of simulated network latency. This way, developers are supported in making design choices regarding typical, re-occurring technical challenges.

关键词： Three-dimensional displays Data analysis Avatars Spatial audio Decision making Collaboration Mixed reality Complexity theory Synchronization Augmented reality

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Augmented reality for enhancement of endoscopic interventions

Augmented reality for enhancement of endoscopic intervention...

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IEEE Annual International Symposium Virtual Reality

作者： U. Bockholt A. Bisler M. Becker W. Muller-Wittig G. Voss Department Visualization & Virtual Reality Fraunhofer Institute for Computer Graphics Darmstadt Germany Centre for Advanced Media Technology (CAMTech) Singapore

computer assisted operation planning systems win more and more recognition in the field of surgery. These systems offer new possibilities to prepare an intervention with the goal to shorten the expansive time in the operation room required for the intervention. The safest and most effective surgical approach should be selected. But often, it is difficult to transfer the output of the planning system to the intra-operative situation and so to consider the planning results in the real intervention. At the Fraunhofer Institute for computer graphics (IGD) in Darmstadt and the Centre for Advanced Media Technology (CAMTech) in Singapore, methods are developed to bridge the gap between the external planning session and the intra-operative case: augmented reality (AR) techniques are used to overlap preoperative scanned image data as well as results of the planning session to the operation field.

关键词： Augmented reality Orthopedic surgery Biomedical imaging Neurosurgery Displays Technology planning Shape Biological tissues Deformable models Endoscopes

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Self-motion illusions in immersive virtual reality environments

Self-motion illusions in immersive virtual reality environme...

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IEEE Annual International Symposium Virtual Reality

作者： Gerd Bruder Frank Steinicke Phil Wieland Visualization and Computer Graphics Research Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

Motion perception in immersive virtual reality environments significantly differs from the real world. For example, previous work has shown that users tend to underestimate travel distances in immersive virtual environments (VEs). As a solution to this problem, some researchers propose to scale the mapped virtual camera motion relative to the tracked real-world movement of a user until real and virtual motion appear to match, i. e., real-world movements could be mapped with a larger gain to the VE in order to compensate for the underestimation. Although this approach usually results in more accurate self-motion judgments by users, introducing discrepancies between real and virtual motion can become a problem, in particular, due to misalignments of both worlds and distorted space cognition. In this paper we describe a different approach that introduces apparent self-motion illusions by manipulating optic flow fields during movements in VEs. These manipulations can affect self-motion perception in VEs, but omit a quantitative discrepancy between real and virtual motions. We introduce four illusions and show in experiments that optic flow manipulation can significantly affect users' self-motion judgments. Furthermore, we show that with such manipulation of optic flow fields the underestimation of travel distances can be compensated.

关键词： visualization Optical sensors Cameras Integrated optics Blindness Optical distortion Detectors

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Optimized GPU histograms for multi-modal registration

Optimized GPU histograms for multi-modal registration

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IEEE International Symposium on Biomedical Imaging

作者： Christoph Vetter Rüdiger Westermann Siemens AG Corporate Research and Development Princeton USA Computer Graphics and Visualization Technische Universität München Germany

ISBN: (纸本)9781424441273

GPU-based systems are used more and more for medical image processing because of their parallel processing power and memory bandwidth. Impressive results have been achieved when registering large volume, however, one of the most-used similarity measures for multi-modal registration - mutual information - is not well suited for the streaming architecture because of its memory access pattern. We present two optimization approaches that improve the performance by a factor of four compared to state-of-the-art GPU algorithms in the latest research papers.

关键词： Biomedical imaging Histograms Streaming media

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Illustrative visualization

Illustrative visualization

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VIS 05: IEEE visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： visualization

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User-centric service brokerage in a personal multi-agent environment

User-centric service brokerage in a personal multi-agent env...

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International Conference on Integration of Knowledge Intensive Multi-Agent Systems (KIMAS)

作者： M.-R. Tazari K. Ploesser Dept. Mobile Information Visualization Fraunhoferstraße 5 64283 Darmstadt Computer Graphics Center (ZGDV e.V) Darmstadt Germany Dept. Mobile Inf. Visualization Comput. Graphics Center Darmstadt Germany

Service brokerage is a central issue in mult-agent systems. Existing approaches often address the brokering among agents in terms of cooperative problem solving. Our work, however, deals with brokering the services offered to users in a multiagent system. The user should be able to choose the desired services and assign concrete tasks to the service-offering agents utilizing those services. To this end, we based our work on the "semantic Web services " approach. After pointing out the problems the users and agents are faced with, we discuss some related approaches and introduce the results of our work: a broker agent as a user service of the agent platform.

关键词： Mobile agents Context-aware services computer graphics visualization Problem-solving Multiagent systems Mobile computing Intelligent agent Protection Open source software

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Procedural shape modeling in digital humanities: Potentials and issues

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8355卷 64-77页

作者： Havemann, Sven Wagener, Olaf Fellner, Dieter Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Fraunhofer IGD and TU Darmstadt Germany Institut fur Europaische Kunstgeschichte University of Heidelberg Germany

Procedural modeling is a technology that has great potential to make the abundant variety of shapes that have to be dealt with in Digital Humanities accessible and understandable. There is a gap, however, between technology on the one hand and the needs and requirements of the users in the Humanities community. In this paper we analyze the reasons for the limited uptake of procedural modeling and sketch possible ways to circumvent the problem. The key insight is that we have to find matching concepts in both fields, which are on the one hand grounded in the way shape is explained, e.g., in art history, but which can also be formalized to make them accessible to digital computers. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Image reconstruction

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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A scalable repository infrastructure for CH digital object management

A scalable repository infrastructure for CH digital object m...

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International Conference on Virtual Systems and MultiMedia

作者： X. Pan T. Schiffer M. Schröttner S. Havemann M. Hecher R. Berndt D. W. Fellner Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria Fraunhofer Austria Research Visual Computing Graz Austria

In recent decades, researchers of archaeological 3D digitalization found that the collection and archive of processing intermediate data are extremely tiresome tasks. They need large of man power and material resources, even though, mistakes can be raised and break the whole working chain. The traditional documentation of digitalization process is also a pending challenge, although, the ISO standard CIDOC-CRM (ISO 21127:2006) has been introduced to the archaeologists and museum professionals since years, but there are still some obvious gaps between practice and theory: (1) How to connect the discrete archaeologists, museums, CH research institutions, and the public? (2) How to ensure the integrity of whole digitalization process and simplify the process? (3) How to maximize the usability of the public digital objects in CH community? (4) How to long term preserve the huge amount of datasets? (5) How to present and disseminate the digital object to the public? This paper presents an operational and optimal infrastructure that realizes not only a distributed storage system, but also a content management system. This infrastructure works as a backbone of whole digitalization process, provides a complete solution suite for archaeologists, museum professionals, museum visitors, and IT technicians.

关键词： Solid modeling Databases Servers Semantics Data models Usability System analysis and design

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A new approach for motion estimation and correction of thermographic images in brain surgery 16

A new approach for motion estimation and correction of therm...

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16th International Workshop on Cellular Nanoscale Networks and Their Applications, CNNA 2018

作者： Moshaei-Nezhad, Yahya Müller, Jens Tetzlaff, Ronald Hoffmann, Nico Institute of Circuits and Systems Faculty of Electronic and Computer Engineering Technische Universität Dresden Dresden01062 Germany Clinical Sensoring and Monitoring Anesthesiology and Intensive Care Medicine Faculty of Medicine Carl Gustav Carus Technische Universität Dresden Dresden01307 Germany Institute of Computer Graphics and Visualization Faculty of Computer Science Technische Universität Dresden Dresden01062 Germany

ISBN: (纸本)9783800747665

Motion estimation and correction implementations are important components of medical image analysis. We present a new approach for motion estimation and correction of thermographic images in brain surgery. In a pre-processing step, the Phase Correlation (PC) method is performed in order to detect large displacements of objects in two successive images. Additionally, due to noise in thermographic images, a Cellular Nonlinear Network (CNN) based image enhancement method is applied. Then, in the following processing step, the Optical Flow (OF) method is employed to compensate local motion artifacts. The proposed algorithm is evaluated during an offline analysis of the recorded dataset of brain surgeries and the performance evaluation between different algorithms is made based on the determination of the Normalized Cross-Correlation (NCC). The results clearly indicate that the proposed algorithm is able to reduce breathing motion artifacts effectively as well as the NCC evaluation show better results in comparison to other mentioned algorithms. © VDE VERLAG GMBH.

关键词： Surgery

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