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2012 13th IEEE International Conference on Multimedia and Expo, ICME 2012

作者： Zhang, Yongfei Zhang, Yunsheng Qin, Shiyin He, Zhihai Beijing Key Lab. of Digital Media School of Computer Science and Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Department of Electrical and Computer Engineering University of Missouri Columbia MO 65211 United States

ISBN: (纸本)9781467316590

Video streaming over mesh networks operates under stringent network resource constraints, with a large number of video sessions competing for limited network resources. In this work, we aim to establish so-called resource-distortion models to characterize the inherent relationship between the allocated network resources to each video session and its end-to-end video distortion or presentation quality at the receiver end. We observed that priority-based packet scheduling has significant impact on such resource-distortion relationship. Using ANN-based learning methods, we develop an end-to-end packet delay bound violation (PDBV) probability model for video streaming over multi-hop networks with priority-based packet scheduling. We then derive a quadratic video transmission distortion model to capture the unique behavior of priority-based packet scheduling and its impact on the end-to-end video distortion. Based on these resource-distortion models, we are able to predict the end-to-end distortion for video streaming over multi-hop networks with priority-based packet scheduling. Our extensive experimental results demonstrate that the proposed method is very accurate. © 2012 IEEE.

关键词： Video streaming

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Interactive high-resolution boundary surfaces for deformable bodies with changing topology

Interactive high-resolution boundary surfaces for deformable...

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8th Workshop on virtual reality Interactions and Physical Simulations, VRIPHYS 2011

作者： Wu, Jun Dick, Christian Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany State Key Lab of Virtual Reality Technology and Systems Beihang University China

ISBN: (纸本)9783905673876

Recent work has demonstrated that composite finite-elements provide an effective means for physically based modeling of deformable bodies. In this paper we present a number of highly effective improvements of previous work to allow for a high-performance and high-quality simulation of boundary surfaces of deformable bodies with changing topology, for instance, due to cuts and incisions. Starting at a coarse resolution simulation grid, along a cut we perform an adaptive octree refinement of this grid down to a desired resolution and iteratively pull the fine level finite-element equations to the coarse level. In this way, the fine level dynamics can be approximated with a small number of degrees of freedom at the coarse level. By embedding the hierarchical adaptive composite finite-element scheme into a geometric multigrid solver, and by exploiting the fact that during cutting only a small number of cells are modified in each time step, high update rates can be achieved for high resolution surfaces at very good approximation quality. To construct a high quality surface that is accurately aligned with a cut, we employ the dual-contouring approach on the fine resolution level, and we instantly bind the constructed triangle mesh to the coarse grid via geometric constrains. © The Eurographics Association 2011.

关键词： Topology

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Delocalized unsteady vortex region detectors

Delocalized unsteady vortex region detectors

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13th International Fall Workshop Vision, Modeling, and Visualization 2008, VMV 2008

作者： Fuchs, Raphael Peikert, Ronald Sadlo, Filip Alsallakh, Bilal Gröller, Meister Eduard Institute of Computer Graphics and Algorithms TU Vienna Austria VRVis Research Center for Virtual Reality and Visualization Vienna Austria Computer Graphics Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781586039219

In this paper we discuss generalizations of instantaneous, local vortex criteria. We incorporate information on spatial context and temporal development into the detection process. The presented method is generic in so far that it can extend any given Eulerian criterion to take the Lagrangian approach into account. Furthermore, we present a visual aid to understand and steer the feature extraction process. We show that the delocalized detectors are able to distinguish between connected vortices and help understanding regions of multiple interacting vortex structures. The delocalized detectors extract smoother structures and reduce noise in the vortex detection result.

关键词： Vortex flow

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JobGrid: Chinese College Graduates Employment Information Grid System

JobGrid: Chinese College Graduates Employment Information Gr...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Feng Zhao Bin Zhou Xiaoxing Sun Hai Jin Song Wu School of Computer Science and Technology Huazhong University of Science & Technology Wuhan China Cluster and Grid Computing Lab Wuhan China The State Key Laboratory of Virtual Reality Technology and Systems Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769533063

This paper proposes a realistic data grid system named JobGrid to construct information platform for Chinese college graduates employment, which supports centralized transaction processing to ensure consistent, effective operation in data access, control, monitor and analysis, and distributed data management to provide heterogeneous data integration, conversion, exaction and export. JobGrid has implemented global uniform view and massively heterogeneous data access, and provided efficiently data and transactions processing and cooperative control mechanism for distributed resource over grid.

关键词： Databases Educational institutions Distributed databases Servers Monitoring computer architecture Employment

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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Visualizing spray paint deposition in VR training

Visualizing spray paint deposition in VR training

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2007 IEEE virtual reality Conference, VR'07

作者： Daeseok, Kim Youngwoo, Yoon Sunyu, Hwang Geehyuk, Lee Jinah, Park Information and Communications University Electronics and Telecommunications Research Institute Computer Graphics and Visualization Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Human-Computer Interaction Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Virtual Reality Research Team 161 Gajeong-dong Yuseong-gu Daejeon 305-700 Korea Republic of

ISBN: (纸本)1424409055

We present a real-time simulation of spray painting incorporated into a VR environment as an alternative training system for ship-building industries. The system allows the user to try out a painting work on life-size structures with a spray gun. Our goal is to provide a trainee realistic painting experience in real-time as well as to represent the thickness of the deposited paint on the surface for evaluation of his performance. The Gaussian model is used for a painting deposition model, and texture mapping technique is utilized to provide efficient visual feedback. We also present effective collision detection methods for a volume of spray paint particles. ©2007 IEEE.

关键词： Interactive computer graphics

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A Hybrid Approach for a Real-time Haptic and Graphic Simulator in virtual Environment

A Hybrid Approach for a Real-time Haptic and Graphic Simulat...

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Sang-Youn Kim Segil Park Dong-Soo Kwon Jinah Park Interactive Virtual Reality Laboratory Korea University of Technology and Education Cheonan South Korea School of Engineering ICU Computer Graphics and Visualization Laboratory Daejeon South Korea Department of Mechanical Engineering Telerobotics & Control Laboratory KAIST Daejeon South Korea

In interacting with a soft object, both visual and haptic senses play major role in providing the characteristics of the object. While visual feedback comes from the appearance of the overall shape, haptic feedback comes largely from the localized internal composition. However, it has been a common practice to represent the object with one model for both processing shape de formation and computing the feedback force, making it much challenging work to achieve real-time simulation of a soft and especially non-homogeneous object. In this paper, we claim that it may be sufficient to represent the graphical visual model as a surface model whereas it is necessary to represent the haptic model as a volumetric model. We propose, therefore, a hybrid model where volumetric haptic model and surface graphical model coexist. For constructing hybrid model, we employ S-chain model to compute the haptic behavior and mass-spring model to calculate graphic behavior. We conduct experiments with volumetric human liver model at a haptic update rate of 1000 Hz and graphic update rate of 30 Hz. The experimental results show that our proposed model satisfies the real-time performance and provides the realistic sense to be useful for a virtual reality application.

关键词： Haptic interfaces graphics virtual environment Shape Force feedback Computational modeling Graphical models Humans Liver virtual reality

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Vertical vergence calibration for augmented reality displays

Vertical vergence calibration for augmented reality displays

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IEEE virtual reality 2006 Conference

作者： Livingston, Mark A. Ellis, Stephen R. White, Sean M. Virtual Reality Lab. Naval Research Laboratory United States Human Information Processing Research Branch NASA Ames Research Center United States Department of Computer Science Columbia University United States

ISBN: (纸本)1424402239

Stereo and bi-ocular head-mounted displays (HMDs) require the user to fuse two,images into a coherent picture of the three-dimensional world, The human visual system performs this task constantly, but when the input images contain both real and graphical depictions, the problem becomes more difficult. A vertical disparity in the,graphics causes diplopia for user's trying to fuse the real and virtual objects simultaneously. We implement three methods, to measure and correct this disparity and assess them with,a collection of a single model of optical see-through HMD.

关键词： augmented reality head-mounted display vergence

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Vertical Vergence Calibration for Augmented reality Displays

Vertical Vergence Calibration for Augmented Reality Displays

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IEEE Annual International Symposium virtual reality

作者： M.A. Livingston S.R. Ellis S.M. White S.K. Feiner A. Lederer Adam Lederer Naval Research Laboratory USA Virtual Reality Lab Naval Research Laboratory Inc. USA Human Information Processing Research Branch NASA Ames Research Center Human Information Processing Research Branch NASA Ames Research Center USA Department of Computer Science Columbia University Department of Computer Science Columbia University USA

Stereo and bi-ocular head-mounted displays (HMDs) require the user to fuse two images into a coherent picture of the threedimensional world. The human visual system performs this task constantly, but when the input images contain both real and graphical depictions, the problem becomes more difficult. A vertical disparity in the graphics causes diplopia for users trying to fuse the real and virtual objects simultaneously. We implement three methods to measure and correct this disparity and assess them with a collection of a single model of optical see-through HMD.

关键词： Calibration Augmented reality Fuses Eyes computer displays Humans Visual system computer graphics Image segmentation virtual reality

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Haptic control of a mobile robot: A user study

Haptic control of a mobile robot: A user study

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2002 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Lee, Sangyoon' Sukhatme, Gaurav S. Kim, Gerard Jounghyun Park, Chan-Mo Virtual Reality Laboratory Dept. of Comp. Sci. and Eng. Pohang Univ. of Sci. and Technol. Pohang Kyoungbuk 790-784 Korea Republic of Robotic Embedded Systems Lab. Dept. of Computer Science University of Southern California Los Angeles CA 90089-0781 United States

We address the problem of teleoperating a mobile robot using shared autonomy: an on-board controller performs obstacle avoidance while the operator uses the manipulandum of a haptic probe to designate the desired speed and rate of turn. Sensors on the robot are used to measure obstacle range information. We describe a strategy to convert such range information into forces, which are reflected to the operator's hand, via the haptic probe. This haptic information provides feedback to the operator in addition to imagery from a front-facing camera mounted on the mobile robot. Extensive experiments with a user population show that the added haptic feedback significantly improves operator performance in several ways (reduced collisions, increased minimum distance between the robot and obstacles) without a significant increase in navigation time.

关键词： Mobile robots

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