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Canadian Conference on Electrical and computer Engineering (CCECE)

作者： Lele Zhou Saif Zahir Image Processing Graphics and Multimedia Lab Computer Science Department University of Northern British Columbia Canada

Binary image compression is desirable for a wide range of applications, such as digital libraries, map archives, fingerprint databases, facsimile, etc. In this paper, we present a new highly efficient algorithm for lossless binary image compression. The proposed algorithm introduces a new method, direct redundancy elimination, to efficiently exploit the two-dimensional redundancy of an image, as well as a novel dynamic context model to improve the efficiency of arithmetic coding. Simulation results show that the proposed algorithm has comparable compression ratio to JBIG standard. In many cases, the proposed algorithm outperforms the JBIG standard

关键词： Image coding Arithmetic Context modeling Image processing computer graphics computer science Electronic mail Multimedia databases Application software Software libraries

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Visual culling techniques for geometric processing in walkthrough application

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Journal of Computational Information Systems 2006年第1期2卷 421-427页

作者： Sunar, Mohd Shahrizal Sembok, Tengku Mohd Tengku Zin, Abdullah Mohd Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System University Teknology Malaysia 81310 Skudai Johor Malaysia Faculty of Information Science and Technology University Kebangsaan Malaysia 43600 Bangi Selangor Malaysia

Virtual reality is a modern approach for problem solving and strategy planning. It saves cost and time for production. Virtual walkthrough application allows users to navigate and absorb in the generated 3D environment with computer graphics assistance. Virtual reality engine is the most important component in virtual reality system. The basic element in virtual reality engine is graphics display. Nevertheless, on the system development where 3D graphics is necessary, there is a conflict between realistic and real time. This paper illustrates the implementation of visual culling techniques such as view frustum culling, back face culling and occlusion culling in the virtual walkthrough application. With the visual culling techniques implemented in the proposed virtual walkthrough system works in real time mode without scarifying realism factor.

关键词： Virtual reality

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Cluster Hull: A Technique for Summarizing Spatial Data Streams

Cluster Hull: A Technique for Summarizing Spatial Data Strea...

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International Conference on Data Engineering

作者： J. Hershberger N. Shrivastava Subhash Suri Mentor Graphics Corporation Wilsonville OR USA Department of Computer Science University of California Santa Barbara CA USA

Recently there has been a growing interest in detecting patterns and analyzing trends in data that are generated continuously, often delivered in some fixed order and at a rapid rate, in the form of a data stream [5, 6]. When the stream consists of spatial data, its geometric "shape" can convey important qualitative aspects of the data set more effectively than many numerical statistics. In a stream setting, where the data must be constantly discarded and compressed, special care must be taken to ensure that the compressed summary faithfully captures the overall shape of the point distribution. We propose a novel scheme, ClusterHulls, to represent the shape of a stream of two-dimensional points. Our scheme is particularly useful when the input contains clusters with widely varying shapes and sizes, and the boundary shape, orientation, or volume of those clusters may be important in the analysis.

关键词： Shape Clustering algorithms Pattern analysis computer graphics computer science Data analysis Statistical distributions Heuristic algorithms Clouds computer vision

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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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