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检索条件"机构=Computer Graphics and Technology"

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A NEW TECHNIQUE FOR RAY TRACING POINT-BASED GEOMETRY

A NEW TECHNIQUE FOR RAY TRACING POINT-BASED GEOMETRY

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2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： YONG QUAN ZHEN-HUA ZHANG WEN-HUI LI WEI LIU Computer Graphics Laboratory College of Computer Science and Technology Jilin University Qianwei Road Changchun 130012 P.R.China Key Laboratory for Symbolic Computation and Knowledge Engineering of Ministry of Education

In this paper a new technique for ray tracing point-based models is *** approach offers a higher ray tracing speed in comparison with previous *** pre-process, we add an important attribute to each point for the purpose of ray *** rendering, an algorithm of intersecting a ray with point geometry is demonstrated to get satisfied *** approach makes it possible to render high quality ray traced images with global *** performs well especially in the way of boundary *** have tested our idea for shadows, reflection and refraction.

关键词： Points Neighbor radius Ray tracing Intersection algorithm Boundary representation

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Multiple View Camera Calibration for Localization

Multiple View Camera Calibration for Localization

引用

ACM/IEEE International Conference on Distributed Smart Cameras, ICDSC

作者： Peter B. L. Meijer Christian Leistner Anthony Martiniere NXP Semiconductors Eindhoven Netherlands Institute for Computer Graphics and Vision Graz University of Technology Graz Austria Ecole Polytechni University of Nice Sophia-Antipolis France

The recent development of distributed smart camera networks allows for automated multiple view processing. Quick and easy calibration of uncalibrated multiple camera setups is important for practical uses of such systems by non-experts and in temporary setups. In this paper we discuss options for calibration, illustrated with a basic two-camera setup where each camera is a smart camera mote with a highly parallel SIMD processor and an 8051 microcontroller. In order to accommodate arbitrary (lens) distortion, perspective mapping and transforms for which no analytic inverse is known, we propose the use of neural networks to map projective grid space back to Euclidean space for use in 3D localization and 3D view interpretation.

关键词： Calibration Smart cameras Wireless sensor networks Intelligent sensors Neural networks Image processing Image sensors Bandwidth computer graphics Microcontrollers

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Secure multimedia streaming over wireless ad-hoc networks for telehealth systems

Secure multimedia streaming over wireless ad-hoc networks fo...

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2nd European Conference on eHealth, ECEH 2007

作者： Hohmann, Bernhard Debbah, Mérouane Leistner, Christian Kröpfl, Andreas Institute for Technical Informatics Graz University of Technology Inffeldgasse 16 8010 Graz Austria Mobile Communications Group Institut Eurecom 2229 Route des Cretes B.P. 193 06904 Sophia Antipolis Cedex France Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16 8010 Graz Austria Zydacron GmbH Teslastrasse 4 8074 Grambach Austria

ISBN: (纸本)9783885792123

In this paper we give a detailed state-of-the-art review for the design and implementation of embedded wireless ad-hoc systems as they are applied for multimedia data transmission. More precisely, this paper focuses on eHealth applications with specific quality of service (QoS) constraints which have to be treated differently compared to other, already standardized systems. Different techniques to secure as well as enhance the reliability of the transmission will be discussed. Furthermore, we present the design of an embedded interactive system for distributed multimedia processing for telehealth. In this interactive home care system, speech recognition is used to enable easy user control. Additionally, the system consists of several wireless network cameras to perform full indoor patient surveillance.

关键词： Speech recognition

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Modeling Agents for real environment

Modeling Agents for real environment

引用

3rd International North-American Conference on Intelligent Games and Simulation, Game-On 'NA 2007

作者： De Oliveira Lyrio, Gustavo Henrique Soares De Beauclair Seixas, Roberto Institute of Pure and Applied Mathematics - IMPA Estrada Dona Castorina 110 Rio de Janeiro RJ 22460-320 Brazil Computer Graphics Technology Group - TECGRAF Catholic University of Rio de Janeiro - PUC-Rio Rua Marqus de So Vicente 255 Rio de Janeiro RJ 22453-900 Brazil

ISBN: (纸本)9789077381359

This work presents Modeling Agents for Real Environments, a framework to build predefined behavior agents and insert then into real environments to run in real time. Coded in Lua, MARE departs from a formal definition of agents and join games techniques such as A* algorithm, finite state machines, terrain tiles and others to build a fully customizable tool for games or simulation creation.

关键词： Software design

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Visual route and virtual network computing exercises for computer network courses

Visual route and virtual network computing exercises for com...

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114th Annual ASEE Conference and Exposition, 2007

作者： Rajaravivarma, Veeramuthu Bellarmine, G. Thomas Central Connecticut State University United States Computer Electronics and Graphics Technology Department Central Connecticut State University New Britain CT United States IEEE-Connecticut Section United States Florida A and M-Florida State University United States Florida A and M University United States IEEE United States ASEE United States

Knowledge of networking concepts (network usage) has become crucial in today's world where all of us use different types of networks in our day-to-day life. But in a field like networking, real understanding can be achieved only by hands-on exercises. In this article, six lab exercises on Visual Route and Virtual Network Computing software suites are discussed, and how they could be further enhanced by teaming them with firewall hardware/packet sniffers, or with firewall software such as Zone Alarm. This work can be expanded with discussions of other networking concepts and technologies that will enhance one's networking experience. © American Society for Engineering Education, 2007.

关键词： computer science

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Automatic Pose Estimation for Range Images on the GPU

Automatic Pose Estimation for Range Images on the GPU

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International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission (3DIMPVT)

作者： Marcel Germann Michael D. Breitenstein In Kyu Park Hanspeter Pfister Computer Graphics Laboratory Swiss Federal Institute of Technology Zurich Switzerland Inha University Incheon South Korea Mitsubishi Electric Research Laboratories Inc. Cambridge MA USA

Object pose (location and orientation) estimation is a common task in many computer vision applications. Although many methods exist, most algorithms need manual initialization and lack robustness to illumination variation, appearance change, and partial occlusions. We propose a fast method for automatic pose estimation without manual initialization based on shape matching of a 3D model to a range image of the scene. We developed a new error function to compare the input range image to pre-computed range maps of the 3D model. We use the tremendous data- parallel processing performance of modern graphics hardware to evaluate and minimize the error function on many range images in parallel. Our algorithm is simple and accurately estimates the pose of partially occluded objects in cluttered scenes in about one second.

关键词： Layout Laboratories computer vision Robustness computer graphics Application software Lighting Euclidean distance Shape Hardware

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Graceful anytime interruptibility for virtual agents

Graceful anytime interruptibility for virtual agents

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4th International Conference on Advances in computer Entertainment technology, ACE 2007

作者： Brügmann, Klaus Prendinger, Helmut Stamminger, Marc Ishizuka, Mitsuru Friedrich-Alexander-Univ. Erlangen-Nürnberg Computer Graphics Group Am Weichselgarten 9 91058 Erlangen Germany National Institute of Informatics 2-1-2 Hitotsubashi Chiyoda-ku Tokyo 101-8430 Japan Graduate School of Information Science and Technology Univ. of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan

ISBN: (纸本)1595936408

The demo will show two highly expressive virtual agents introducing the audience to a traditional Japanese room. The agent models and gestures have been created by a professional Japanese character designer. By adapting and extending an influential technique ("Verbs and Adverbs"), we added parameterized emotional expression and gesture interruptibility as new behaviors to increase agent believability, interactivity, and responsiveness. In the demo, users will be provided a simple interface to test the new features.

关键词： Virtual reality

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Animation Generation and Retargeting Based on Physics Characteristics

Animation Generation and Retargeting Based on Physics Charac...

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Yao-Yang Tsai Hung-Kuo Chu Kuangyou B. Cheng Tong-Yee Lee Chen-Lan Yen Computer Graphics Group/Visual System Lab National Cheng Kung University Taiwan Institute of Physical Education Health and Leisure Studies National Cheng Kung University Taiwan Industrial Technology and Research Institute Tainan Taiwan

ISBN: (纸本)9780769529943;0769529941

Motion retargeting can be achieved by direct shape deformation transfer but may be visually unrealistic and physically incorrect. The purpose of this study is to include the consideration of physical properties for more realistic target motion synthesis. After partitioning source and target objects into segments, each segment mass and center of mass (COM) position/velocity are estimated. The target animation is generated by minimizing the difference in total linear momentum between source and target. Weighting functions for addressing the importance of segment motion and constraints on unrealistic segment length/velocity are also included. The results show that target movement amplitude and velocity are generally smaller than those of the source animation and with less seemly unrealistic motion. Thus, plausible animation can be generated by the retargeting procedures proposed in this study. The same methods may be applied to a variety of different target models for realistic motion synthesis.

关键词： Animation Character generation computer graphics Humans Visual system computer science education Physics education computer industry Educational technology Shape

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Simulated Reality in Automotive Design

Simulated Reality in Automotive Design

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International Conference on Cyberworlds

作者： Andre Stork Clemens-August Thole Stanislav Klimenko Igor Nikitin Lialia Nikitina Yuri Astakhov IGD Fraunhofer Institute of Computer Graphics Research (IGD) Darmstadt Germany SCAI Fraunhofer Institute for Algorithms and Scientific Computing Darmstadt Germany ICPT Institute of Computing for Physics and Technology Moscow Russia Mathematical Institute University of Cologne Germany

In this paper we introduce Simulated Reality (SR) as a new concept for the interplay between simulation, optimization and interactive visualization. We see SR as a new metaphor for the interactive visual exploration of simulation and optimization results. The vision of Simulated Reality implies interactive behavior of simulations. Fact is today that simulations might still need hours of computation time, especially in crash worthiness. This paper shows approaches to come closer to the vision of SR. Combining design of experiments methods, metamodeling, new interpolation schemes and innovative graphics methods, we enable to user to interact with simulation parameters, optimization criteria and come to a new interpolated crash result within seconds. The approaches have been successfully applied for solution of real life car design optimization problems.

关键词： Automotive engineering Computational modeling Strontium Design optimization Visualization computer crashes Design methodology Metamodeling Interpolation graphics

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Using computer simulation to teach undergraduate engineering and technology students ergonomics

Using computer simulation to teach undergraduate engineering...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Chang, Yi-Hsiang Miller, Craig Purdue University United States Department of Computer Graphics Technology Purdue University United States

In this article, we are presenting a senior level course module on ergonomics that was developed at Purdue University. Instead of lecturing on the basic principles, this course module consisted of two core exercises. The exercises were based on a computer simulation package available on campus. With a two-hour brief of the domain knowledge, students learned how to manipulate the manikin in a virtual environment to accomplish a given task. After the students became familiar with the major functions of the software, various assembly process plans from industry partners were distributed, where the individual students were to model and verify human operations specified in the worksheets. Through the "hands-on" experience and group discussion in a problem-based learning setup, students were exposed to various topics of ergonomics in the workplace. The topics included postures, movements, viewing angles, and mental loads along with possible injures and health concerns. It appeared that the students' awareness and attitude toward ergonomics had significantly changed after taking this course module. A follow-up study to evaluate this course and investigate its potential contribution to undergraduate engineering and technology education is discussed at the end of the article. © American Society for Engineering Education, 2006.

关键词： Engineering technology

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