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Anycast Algorithms Supporting Optical Burst Switched Grid Networks

Anycast Algorithms Supporting Optical Burst Switched Grid Ne...

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International Conference on Networking and Services (ICNS)

作者： M. De Leenheer F. Farahmand Kejie Lu Tao Zhang P. Thysebaert B. Volckaert F. De Turck B. Dhoedt P. Demeester J.P. Jue Department of Information Technology Ghent University - IBBT - IMEC Department of Computer Electronics and Graphics Technology Central Connecticut State University Department of Electrical and Computer Engineering University of Puerto Rico at Mayagüez Department of Computer Science New York Institute of Technology Old Westbury Department of Electrical Engineering and Computer Science The University of Texas at Dallas

In this paper we consider implementing optical burst switching as a technology for building grids with computationally intensive requirements. This architecture has been referred to as grid-over-OBS (GoOBS). First, we briefly describe the proposed layered grid architecture and show how OBS can be positioned within the grid architecture. Then, we present a generic framework for anycast routing in the context of GoOBS when requests don't have an explicit destination address and they can be serviced by any appropriate grid resource. We also develop several algorithms to support anycasting when only a single copy of a request is transmitted. Through simulation analysis, we show the performance of our anycast algorithms and compare them with traditional shortest-path unicast routing in which all jobs have specific addresses. Our performance analysis focuses on blocking probability of requests and average end-to-end delay

关键词： Optical fiber networks computer architecture Routing Performance analysis Optical burst switching Buildings Grid computing Optical computing Context-aware services Analytical models

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Range Detection Approach in Interactive Virtual Heritage Walkthrough

Range Detection Approach in Interactive Virtual Heritage Wal...

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International Conference on Artificial Reality and Telexistence (ICAT)

作者： M.S. Sunar A.M. Zin T.M.T. Sembok Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

Exploring virtual world will give a memorable experience to the users. Generally, they are expecting smooth navigation with high quality image drawn into their eyes. Nevertheless, when the virtual world is growing simultaneously with the number of objects, the navigation will be detained. Yet, the frame rates can become unacceptable. In this paper, we present and examine range detection approach for view frustum culling to effectively speed-up the interactive virtual heritage project namely Ancient Malacca Virtual Walkthrough. Normal six plane view frustum culling approach use the plane equation to test whether objects is within the visible region. However, range detection approach is different with normal six plane view frustum. It is based on camera referential point and tests the objects if they are in the viewing range. The results show that this approach is able to increase the rendering performance of the virtual walkthrough without sacrificing the visual quality.

关键词： computer graphics Application software Navigation Rendering (computer graphics) Visualization Testing Cameras Virtual environment Multimedia systems computer science

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Accelerating virtual walkthrough with visual culling techniques

Accelerating virtual walkthrough with visual culling techniq...

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International Conference on Computing & Informatics (ICOCI)

作者： Mohd Shahrizal Sunar Tengku Mohd Tengku Sembok Abdullah Mohd Zin Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

Virtual walkthrough application allows users to navigate and immerse in the generated 3D environment with computer graphics assist. The 3D environment requires a large amount of geometry to make it look realistic. When the number of geometry increase, the performance of the application will become slower. Consequently, it creates a conflict between the needs of realistic and real time. In this paper, we discuss the implementation of visual culling techniques such as view frustum culling, back face culling and occlusion culling in the virtual walkthrough application. We render only what we can see during the application runtime and cull away unnecessary geometry. This will accelerate the performance of the system. Without the culling techniques implemented in virtual reality application such as virtual walkthrough, the system has to allocate a large space of memory to store the geometry data. We have tested these techniques to the Ancient Malacca data. With the visual culling techniques implemented, the virtual walkthrough system can work in real time mode without scarifying realism factor.

关键词： Acceleration Computational modeling Geometry Virtual reality computer graphics Application software Navigation Testing Real time systems Visualization

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Adaptive demosaicking using multiple neural networks

Adaptive demosaicking using multiple neural networks

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2006 16th IEEE Signal Processing Society Workshop on Machine Learning for Signal Processing, MLSP 2006

作者： Yangjing, Long Yizhen, Huang Department of Mathematics Shanghai Jiaotong University 800 Dongchuan Road Minhang District Shanghai 200240 China Department of Computer Science and Engineering Shanghai Jiaotong University 800 Dongchuan Road Minhang District Shanghai 200240 China Digital Media and Data Reconstruction Lab. Shanghai Jiaotong University Graphics Team of the Wireless Platform Engineering Cellular and Handheld Group Intel Asia-Pacific Research and Development Ltd.

ISBN: (纸本)1424406560

Demosaicking is one of the important tasks in the image-processing pipeline in digital cameras using a single electronic sensor overlaid with a Color Filter Array. We quantitatively shows that, demosaicking algorithms perform better in low-gradient flat areas than in high-gradient steep areas. Based on this, an adaptive scheme is proposed that uses more complex neural networks to tackle steep areas in larger sizes of neighborhoods. And interpolation is edge-directed with different networks for different chosen directions. Thus networks are specialized in learning and depicting non-linear spatial inter-pixel correlations at respective gradients and directions. Its performance surpasses Go's neural-network method greatly. Compared with 2 recent state-of-the-art methods, our method provides an excellent trade-off between computational expense and PSNR, and well preserves image edge information. As an extension, we compare the performance of these algorithms with and without Lukac's postprocessing. © 2006 IEEE.

关键词： Adaptive systems

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Super-resolution using neural networks based on the optimal recovery theory

Super-resolution using neural networks based on the optimal ...

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2006 16th IEEE Signal Processing Society Workshop on Machine Learning for Signal Processing, MLSP 2006

作者： Huang, Yizhen Long, Yangjing Department of Computer Science and Engineering Shanghai Jiaotong University 800 Dongchuan Road Minhang District Shanghai 200240 China Department of Mathematics Shanghai Jiaotong University 800 Dongchuan Road Minhang District Shanghai 200240 China Graphics Team of the Wireless Platform Engineering Cellular and Handheld Group Intel Asia-Pacific Research and Development Ltd. Digital Media and Data Reconstruction Lab. Shanghai Jiaotong University

ISBN: (纸本)1424406560

An optimal recovery based neural-network Super Resolution algorithm is developed. The proposed method is computationally less expensive and outputs images with high subjective quality, compared with previous neural-network or optimal recovery algorithms. It is evaluated on classical SR test images with both generic and specialized training sets, and compared with other state-of-the-art methods. Results show that our algorithm is among the state-of-the-art, both in quality and efficiency. © 2006 IEEE.

关键词： Image quality

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Design Review in a Distributed Collaborative Virtual Environment

Design Review in a Distributed Collaborative Virtual Environ...

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作者： Cao, Weiqun Gaertner, Hendrik Guddat, Hannes Straube, Andreas M. Conrad, Stefan Kruijff, Ernst Langenberg, Dirk Fraunhofer Institute for Media Communication Schloss Birlinghoven Sankt AugustinD-53754 Germany Department of Computer Science and Technology Beijing Forestry University Beijing100083 China Fraunhofer Institute for Production System and Design Technology Pascalstr.8-9 BerlinD-10587 Germany Fraunhofer Institute for Computer Graphics Rundeturmstrasse 6 DarmstadtD-64283 Germany Fraunhofer Institute for Production Technology Steinbachstrasse 17 AachenD-52074 Germany Beijing Forestry University P.O. Box 193 Tsinghuadong Road 35 Haidian District Beijing100083 China

Virtual Reality leads Digital Product Development technology to a more effective and convenient way by presenting the product model in an immersive real 3D environment. Distributed VR even enables partners to discuss the design of the product independent of their locations. This paper introduces our work with a Digital Product Development System with Virtually Cooperating Teams Using High Bandwidth Networks-ProViT, which aims at building up immersive telepresence systems for design review across high-bandwidth networks. Video and audio streaming are integrated in the virtual environment to support immersive teleconference aspects of the distributed design review sessions. A network management system has been developed for the supervision, maintenance and processing of distributed setups, and network security. © 2006 World Scientific Publishing Company.

关键词： Virtual reality

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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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Towards automatic setup of distributed multimedia applications

Towards automatic setup of distributed multimedia applicatio...

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9th IASTED International Conference on Internet and Multimedia Systems and Applications, IMSA 2005

作者： Lohse, Marco Slusallek, Philipp Computer Graphics Lab Department of Computer Science Saarland University Germany

ISBN: (纸本)0889865108

Recent developments in the area of multimedia middleware have proven to provide suitable abstractions for supporting various ubiquitous computing scenarios. As a typical example, home entertainment applications aim at providing a "follow-me" service, where audio/video output is performed using devices embedded in the current surrounding of the user. However, manually setting up such distributed multimedia applications is a complex task. Therefore, middleware needs to provide further guidance. In this paper, we provide an in-depth analysis of the challenges for such a service. Based on these observations, an algorithm is derived that allows for the automatic creation of distributed multimedia data flow graphs from a given high-level description. The applicability and performance of our approach is evaluated by demonstrating relevant application scenarios.

关键词： Multimedia systems

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Feature-preserving mesh denoising via bilateral normal filtering

Feature-preserving mesh denoising via bilateral normal filte...

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9th International Conference on computer Aided Design and computer graphics, CAD/CG 2005

作者： Lee, Kai-Wah Wang, Wen-Ping Computer Graphics Group Department of Computer Science University of Hong Kong

ISBN: (纸本)0769524737

In this paper, we propose a feature-preserving mesh denoising algorithm which is effective, simple and easy to implement. The proposed method is a two-stage procedure with a bilateral surface normal filtering followed by integration of the normals for least squares error (LSE) vertex position updates. It is well-known that normal variations offer more intuitive geometric meaning than vertex position variations. A smooth surface can be described as one having smoothly varying normals whereas features such as edges and corners appear as discontinuities in the normals. Thus we cast feature-preserving mesh denoising as a robust surface normal estimation using bilateral filtering. Our definition of "intensity difference" used in the influence weighting function of the bilateral filter robustly prevents features such as sharp edges and corners from being washed out. We will demonstrate this capability by comparing the results from smoothing CAD-like models with other smoothing algorithms. © 2005 IEEE.

关键词： Algorithms

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Cost Prediction Maps for Global Illumination

Cost Prediction Maps for Global Illumination

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2005 EG UK Theory and Practice of computer graphics, TPCG 2005

作者： Gillibrand, Richard Debattista, Kurt Chalmers, Alan Computer Graphics Group Department of Computer Science University of Bristol United Kingdom

ISBN: (纸本)3905673568

There is a growing demand from the media industry, including computer games, virtual reality and simulation, for increasing realism in real-time for their computer generated images. Despite considerable advances in processing power and graphics hardware, increasing scene complexity means that it is still not possible to achieve high fidelity computer graphics in a reasonable, let alone real, time on a single computer. Cost prediction is a technique which acquires knowledge of computational complexity within the rendering pipeline as the computation progresses and then uses this to best allocate the available resources to achieve the highest perceptual quality of an image in a time constrained system. In this paper we describe a method of acquiring computational cost complexity knowledge within a high fidelity graphics environment. This cost map may be used in combination with other perceptually derived maps to control a selective renderer in order to achieve the best perceptual quality results for a user specified frame-rate. © The Eurographics Association 2005

关键词： computer games

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