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International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Martin Knecht Christoph Traxler Werner Purgathofer Michael Wimmer Institute of Computer Graphics and Algorithms University of Technology Vienna Austria VRVis Research Center for Virtual Reality and Visualization Austria

We present a novel adaptive color mapping method for virtual objects in mixed-reality environments. In several mixed-reality applications, added virtual objects should be visually indistinguishable from real objects. Recent mixed-reality methods use global-illumination algorithms to approach this goal. However, simulating the light distribution is not enough for visually plausible images. Since the observing camera has its very own transfer function from real-world radiance values to RGB colors, virtual objects look artificial just because their rendered colors do not match with those of the camera. Our approach combines an on-line camera characterization method with a heuristic to map colors of virtual objects to colors as they would be seen by the observing camera. Previous tone-mapping functions were not designed for use in mixed-reality systems and thus did not take the camera-specific behavior into account. In contrast, our method takes the camera into account and thus can also handle changes of its parameters during runtime. The results show that virtual objects look visually more plausible than by just applying tone-mapping operators.

关键词： Image color analysis Cameras Virtual reality Color Lighting Rendering (computer graphics) visualization

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Automated 3D heart segmentation by search rays for building individual conductor models

Automated 3D heart segmentation by search rays for building ...

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Medical Imaging 2009: visualization, Image-Guided Procedures, and Modeling

作者： Kim, Jaeil Kim, Seokyeol Kim, Kiwoong Park, Jinah Computer Graphics and Visualization Laboratory Information and Communications University 119 Munji-ro Yusung-gu Daejeon Korea Republic of Center for Brain and Cognitive Science Research Korea Research Institute of Standards and Science 209 Gajung-ro Yusung-gu Daejeon Korea Republic of

ISBN: (纸本)9780819475121

Magnetocardiograph (MCG) is one of the most useful diagnosing tools for myocardial ischemic diseases and the conduction abnormality, since the technique directly measures magnetic fields generated by myocardial currents without distortion in a non-invasive way. To localize the current source accurately, building a patient-specific conductor model is indispensable. In this paper, we present the method to automatically construct a patient-specific three-dimensional (3D) mesh model of a human thorax and a heart consisting of pericardium and four chambers. We represent the standard thorax model by simplex meshes, and deform them to fit into the individual CT data to reconstruct accurate surface representations for the MCG conductor model. The deformable simplex mesh model deforms based on the external forces exerted by the edge and gradient components of the source volume data while its internal force acts to maintain the integrity of the shape. However, image driven deformation is often very sensitive to its initial position. Therefore, we suggest our solution to automatic region-of-interest (ROI) detection using search rays, which are casted to 3D volume images to identify the region of a heart based on both the radiodensity values and their continuity along the path of the rays. Upon automatic ROI detection with search rays, the initial position and orientation of the standard mesh model is determined, and each vertex of the model is respectively moved by the weighted sum of the internal and eternal forces to conform to the each patient's own thorax and heart shape while minimizing the user's input. © 2009 SPIE.

关键词： Heart

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Polyhedra generation from lattice points 6th

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6th International Workshop on Discrete Geometry for computer Imagery, DGCI 1996

作者： Kenmochi, Yukiko Imiya, Atsushi Ezquerra, Norberto F. Dept. of Information and Computer Sciences Chiba University 1-33 Yayoi-cho Inage-kuChiba263 Japan Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

ISBN: (纸本)9783540620051

This paper focuses on a method for generating polyhedra from a set of lattice points, such as three-dimensional (3D) medical computerized tomography images. The method is based on combinatoriM topology [1] and algebraic properties of the 3D lattice space [2]. It is shown that the method can uniquely generate polyhedra from a subset of the lattice space independently of the choice of neighborhood. Furthermore, a practical algorithm is developed and experimental results using 3D medical imagery are presented. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Topology

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Exploiting networks for visualization and collaboration: No network roadblocks? 94

Exploiting networks for visualization and collaboration: No ...

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21st Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1994

作者： Rhyne, Theresa Marie Brett, George Brutzman, Don Cox, Donna J. Santos, Adelino Martin Marietta U.S. EPA Scientific Visualization Center United States Clearinghouse for Networked Information Discovery and Retrieval United States Naval Postgraduate School United States National Center for Supercomputing Applications United States Fraunhofer Institute for Computer Graphics Germany

No abstract available.

ISBN: (纸本)0897916670

No abstract available.

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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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visualization for validation and improvement of three-dimensional segmentation algorithms

Visualization for validation and improvement of three-dimens...

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7th Joint Eurographics - IEEE VGTC Symposium on visualization, VisSym 2005

作者： Weber, G.H. Luengo Hendriks, C.L. Keränen, S.V.E. Dillard, S.E. Ju, D.Y. Sudar, D. Hamann, B. Berkeley Drosophila Transcription Network Project Visualization and Computer Graphics Research Group Institute for Data Analysis and Visualization University of California Davis One Shields Avenue DavisCA95616 United States Genomics and Life Sciences Division Lawrence Berkeley National Laboratory One Cyclotron Road BerkeleyCA94720 United States

ISBN: (纸本)3905673193

The Berkeley Drosophila Transcription Network Project (BDTNP) is developing a suite of methods that will allow a quantitative description and analysis of three dimensional (3D) gene expression patterns in an animal with cellular resolution. An important component of this approach are algorithms that segment 3D images of an organism into individual nuclei and cells and measure relative levels of gene expression. As part of the BDTNP, we are developing tools for interactive visualization, control, and verification of these algorithms. Here we present a volume visualization prototype system that, combined with user interaction tools, supports validation and quantitative determination of the accuracy of nuclear segmentation. visualizations of nuclei are combined with information obtained from a nuclear segmentation mask, supporting the comparison of raw data and its segmentation. It is possible to select individual nuclei interactively in a volume rendered image and identify incorrectly segmented objects. Integration with segmentation algorithms, implemented in MATLAB, makes it possible to modify a segmentation based on visual examination and obtain additional information about incorrectly segmented objects. This work has already led to significant improvements in segmentation accuracy and opens the way to enhanced analysis of images of complex animal morphologies. © The Eurographics Association 2005.

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Noise cancellation frontends for automatic meeting transcription

Noise cancellation frontends for automatic meeting transcrip...

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6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006

作者： Képesi, Marián Van Pham, Tuan Kubin, Gernot Weruaga, Luis Juffinger, Andreas Grabner, Michael Signal Processing and Speech Communication Laboratory Graz University of Technology Inffeldgasse 8010 Graz Austria Commission for Scientific Visualization Austrian Academy of Sciences Donau-City Strasse 1 Vienna Austria Institute for Theoretical Computer Science Graz University of Technology Inffeldgasse 8010 Graz Austria Institute for Computer Graphics Graz University of Technology Inffeldgasse 8010 Graz Austria

One research direction to make computers become more active machines is to use audio input with far-field omni-directional microphones, these being required to face the acoustics problem of the meeting scenario. This topic is not only interesting from an artificial listener point-of-view, but also as one of the hottest topics in searchable media. In this paper two noise suppression methods for real meeting audio are evaluated. Because of the usage of hands-free microphones in a meeting environment, the reverberation of meeting rooms and background noise sources such as projector, computer fan have huge impact on speech quality. Two denoising methods, based on statistical Wavelet filtration and short-time Fourier transform are discussed and evaluated. Whilst the quantile technique is suitable for estimating stationary noise (beamer, computer fan), non-stationary sources (closing door, chair movement) can be handled by recursive structure and adaptive temporal gain of the statistical filtration method. Besides, frequency non-linear gain can remove colored noise effectively. The proposed noise reduction methods are evaluated with speaker localizing application applied on the meeting database of the Mistral project. The results show the pros and cons of each method applied on the meeting database.

关键词： Microphones

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Peter M. Roth Volker Settgast Peter Widhalm Marcel Lancelle Josef Birchbauer Norbert Brändle Sven Havemann Horst Bischof Graz University of Technology Institute for Computer Graphics and Vision Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austrian Institute of Technology Dynamic Transportation Systems Siemens AG Österreich Corporate Technology (CT T CEE) Austria

Existing visual surveillance systems typically require that human operators observe video streams from different cameras, which becomes infeasible if the number of observed cameras is ever increasing. In this paper, we present a new surveillance system that combines automatic video analysis (i.e., single person tracking and crowd analysis) and interactive visualization. Our novel visualization takes advantage of a high resolution display and given 3D information to focus the operator's attention to interesting/ critical areas of the observed area. This is realized by embedding the results of automatic scene analysis techniques into the visualization. By providing different visualization modes, the user can easily switch between the different modes and can select the mode which provides most information. The system is demonstrated for a real setup on a university campus.

关键词： Cameras Three dimensional displays visualization Surveillance Solid modeling Trajectory

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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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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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