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6th Pacific Rim Conference on Multimedia - Advances in Mulitmedia Information Processing - PCM 2005

作者： Cha, Jongeun Kim, Seung-Man Kim, Sung-Yeol Kim, Sehwan Yoon, Seung-Uk Oakley, Ian Ryu, Jeha Lee, Kwan H. Woo, Woontack Ho, Yo-Sung Human-Machine-Computer Interface Lab. Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Intelligent Design and Graphics Lab. Korea Republic of Visual Communication Lab. Korea Republic of U-VR Lab. Korea Republic of

ISBN: (纸本)3540300406

This paper presents a prototype of a client system for Realistic Broadcasting that can receive and process immersive media. It provides a viewer which supports stereoscopic video display and haptic interaction with the displayed media. The structure of the system is introduced and each component is described. In order to show the fear sibility of Realistic Broadcasting, a home shopping channel scenario is applied to the system and its demonstration is performed in an exhibition. We also discuss users' comments and directions for improving of Realistic Broadcasting. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Broadcasting

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Haptic interaction with depth video media

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6th Pacific Rim Conference on Multimedia - Advances in Mulitmedia Information Processing - PCM 2005

作者： Cha, Jongeun Kim, Seung-Man Oakley, Ian Ryu, Jeha Lee, Kwan H. Human-Machine-Computer Interface Lab. Dept. of Mechatronics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Intelligent Design and Graphics Lab. Dept. of Mechatronics

ISBN: (纸本)3540300279

In this paper we propose a touch enabled video player system. A conventional video player only allows viewers to passively experience visual and audio media. In virtual environment, touch or haptic interaction has been shown to convey a powerful illusion of the tangible nature - the reality - of the displayed environments and we feel the same benefits may be conferred to a broadcast, viewing domain. To this end, this paper describes a system that uses a video representation based on depth images to add a haptic component to an audio-visual stream. We generate this stream through the combination of a regular RGB image and a synchronized depth image composed of per-pixel depth-from-camera information. The depth video, a unified stream of the color and depth images, can be synthesized from a computer graphics animation by rendering with commercial packages or captured from a real environment by using a active depth camera such as the Zcam™. In order to provide a haptic representation of this data, we propose a modified proxy graph algorithm for depth video streams. The modified proxy graph algorithm can (i) detect collisions between a moving virtual proxy and time-varying video scenes, (ii) generates smooth touch sensation by handling the implications of the radically different display update rates required by visual (30Hz) and haptic systems (in the order of 1000Hz), (iii) avoid sudden change of contact forces. A sample experiment shows the effectiveness of the proposed system. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Video signal processing

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VR - A reality check?

VR - A reality check?

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IEEE Virtual Reality 2005

作者： Smith, Randall C. Sandin, Dan Fisher, Brian D. Westin, Stephen H. General Motors R and D Electronic Visualization Lab. U. Illinois Chicago School of Interactive Arts and Technology Simon Fraser University Program of Computer Graphics Cornell University

Within the large spectrum of possible VR application areas, automotive applications were among the first to appear, and are among the most demanding. technology has not been sufficiently sophisticated for many tasks. The troubling thought is that we are happy to push the technology envelope, but don't really know how useful this technology is, or can be. Could I do my job even if I had a real-time, ortho-stereoscopic, head-tracked, multi-viewer, wide-field-of-view, high-dynamic-range display with eye-limiting acuity?

关键词： Virtual reality

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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 lab.l 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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Evaluation Methodology of computer graphics Education for Visual Media Contents Production

Evaluation Methodology of Computer Graphics Education for Vi...

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7th China-Japan Joint Conference on graphics Education

作者： Ayumi Miyai Tagiru Nakamura Computer Graphics Arts Society (CG-ARTS Society) Tokyo Japan Creative Lab. Katayanagi Advanced Research Laboratories Tokyo University of Technology

computer graphics (CG) are indispensable for visual media contents production of film, television program, game, music video, etc. Therefore, CG creators have knowledge and expertise including visual

关键词： CG education, visual media contents, evaluation method, simulation test

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Unconstrained free-viewpoint video coding

Unconstrained free-viewpoint video coding

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IEEE International Conference on Image Processing

作者： E. Lamboray S. Wurmlin M. Waschnusch M. Gross H. Pfister Computer Graphics Laboratory Swiss Federal Institute of Technology Zurich Switzerland Swiss Federal Institute of Technology (ETH) Computer Graphics Laboratory Zurich Switzerland Eidgenossische Technische Hochschule Zurich Zurich ZH CH Comput. Graphics Lab. Swiss Fed. Inst. of Technol. Zurich Switzerland MERL - Mitsubishi Electric Research Laboratories Cambridge MA USA

In this paper, we present a coding framework addressing image-space compression for free-viewpoint video. Our framework is based on time-varying 3D point samples which represent real-world objects. The 3D point samples are obtained after a geometrical reconstruction from multiple pre-recorded video sequences and thus allow for arbitrary viewpoints during playback. The encoding of the data is performed as an off-line process and is not time-critical. The decoding however, must support for real-time rendering of the dynamic 3D data. We introduce a compression framework which encodes multiple point attributes like depth and color into progressive streams. The reference data structure is aligned on the original camera input images and thus enables for easy view-dependent decoding. A novel differential coding approach permits random access in constant time throughout the entire data set and thus enables arbitrary viewpoint trajectories in both time and space.

关键词： Video coding Image coding Decoding Video compression Image reconstruction Video sequences Encoding Time factors Rendering (computer graphics) Streaming media

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Surface Reconstruction of Freeform Objects Based on Multiresolution Volumetric Method

Surface Reconstruction of Freeform Objects Based on Multires...

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作者： Azernikov, Sergei Miropolsky, Alex Fischer, Anath Lab. for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Inst. of Technology Haifa 32000 Israel

Recently developed 3D scanning devices are capable of capturing point clouds, as well as additional information, such as normals and texture. This paper describes a new and fast reverse engineering method for creating a 3D computerized model from data captured by such contemporary 3D scanning devices. The proposed method aggregates large-scale 3D scanned data into an extended Hierarchical Space Decomposition Model (HSDM) based on Octree data structure. This model can represent both an object's boundary surface and its interior volume. The HSDM enables data reduction, while preserving sharp geometrical features and object topology. As a result the execution time of the reconstruction process is significantly reduced. Moreover, the proposed model naturally allows multiresolution surface reconstruction, represented by a mesh with regular properties. Based on the proposed volumetric model, the surface reconstruction process becomes, more robust and stable with respect to sampling noise.

关键词： Reverse engineering

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Hierarchical model for real time simulation of virtual human crowds 5

Hierarchical model for real time simulation of virtual human...

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5th IEEE EMBS International Summer School on Biomedical Imaging, SSBI 2002

作者： Musse, S.R. Thalmann, D. Computer Graphics Lab. Swiss Federal Institute of Technology EPFL DI-LIG Lausanne Switzerland

ISBN: (纸本)0780375076

This paper describes a model for simulating crowds of humans in real time. We deal with a hierarchy composed of virtual crowds, groups and individuals. The groups are the most complex structure that can be controlled in different degrees of autonomy. This autonomy refers to the extent to which the virtual agents are independent of the user intervention and also the amount of information needed to simulate crowds. Thus, depending on the complexity of the simulation, simple behaviors can be sufficient to simulate crowds. Otherwise, more complicated behavioral rules can be necessary, and in this case, it can be included in the simulation data in order to improve the realism of the animation. We present three different ways for controlling crowd behaviors: i) by using innate and scripted behaviors;ii) by defining behavioral rules, using events and reactions, and, iii) by providing an external control to guide crowd behaviors in real time. The two main contributions of our approach are: the possibility of increasing the complexity of group/agent behaviors according to the problem to be simulated, and the hierarchical structure based on groups to compose a crowd. © 2002 IEEE.

关键词： behavioral animation crowd motion degrees of autonomy reactive behaviors synthetic autonomous agents virtual human crowds

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Interaction techniques with virtual humans in mixed environments

Interaction techniques with virtual humans in mixed environm...

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IEEE EMBS International Summer School on Biomedical Imaging

作者： S. Balcisoy M. Kallman R. Torre P. Fua D. Thalman Computer Graphics Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Ecole Polytechnique Federale de Lausanne Lausanne VD CH Comput. Graphics Lab. Swiss Fed. Inst. of Technol. Lausanne Switzerland

Homogenous virtual environments evolved into mixed environments thanks to recent augmented reality techniques. We have done research on novel interaction techniques in virtual environments exploiting the usage of 3D virtual space. We will briefly present our augmented reality set-up for mixed reality experiments and we will analyze two distinct mixed environment case studies, and present two new interaction techniques where we use virtual humans as mediators between the real and virtual world.

关键词： Humans Virtual environment Augmented reality Workstations Animation Virtual reality Rendering (computer graphics) Biological system modeling computer graphics Space technology

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A Web adaptive educational system for people with hearing difficulties

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Education and Information Technologies 2000年第3期5卷 189-200页

作者： Markellou, Penelope Rigou, Maria Sirmakessis, Spiros Tsakalidis, Athanasios Computer Engineering and Informatics Department Multimedia Graphics and GIS Lab. University of Patras Patras 26500 Greece Internet and Multimedia Technologies Research Unit Computer Technology Institute Patras 26221 61 Riga Feraiou Str. Greece

In this paper we present a web adaptive educational tool for the Greek Sign Language. The design and the implementation of the tool were partially funded by national bodies. The paper presents the architecture of the tool, in an abstract way and briefly describes its functionality. The interaction process followed is also presented. © 2000 Kluwer Academic Publishers.

关键词： Architecture Hearing difficulties Interactive learning Sign language

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