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IEEE International Workshop on System-on-Chip for Real-Time Applications

作者： Sherif Saif Hazem M. Abbas Salwa M. Nassar Abdelmonem A. Wahdan Mentor Graphics Corp Cairo Egypt Computers & Systems Department Electronics Research Institute (ERI) Giza Egypt Dept. Computer and Systems Engineering Ain Shams University Cairo Egypt

ISBN: (纸本)1424408989

This paper presents an implementation for image compression using variable block truncation coding (BTC) on a field programmable gate array (FPGA). The compression technique is improved by employing a cost function obtained using Hopfield neural network (HNN), upon which a block is classified as either a high- or a low-detail block. Accordingly, different blocks are coded with different bit rates and thus better compression ratios are achieved. The paper formulates the utilization of HNN within the BTC algorithm in such a way that a viable FPGA implementation is produced. The Xilinx Virtex EBTC implementation has shown to provide a processing speed of about 1.113 times 10 6 of pixels per second with a compression ratio which varies between 1.25 and 2 bits per pixel, according to the image homogeneity

关键词： Field programmable gate arrays Image coding Pixel Hardware Costs Hopfield neural networks Network synthesis System-on-a-chip Real time systems Application software

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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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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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Erratum to June-issue Table of Contents

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IEEE Transactions on Biomedical engineering 2006年第8期53卷 1728-1728页

作者： C. Vidaurre A. Schlogl R. Cabeza R. Scherer G. Pfurtscheller Department of Electrical Engineering and Electonics State University of Navarra Pamplona Spain Institute of Human-Computer Interfaces BCI-Lab Institute for Computer Graphics Graz University of Technology Graz Austria

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Erratum to “A Fully On-Line Adaptive BCI”

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IEEE Transactions on Biomedical engineering 2006年第8期53卷 1728-1728页

作者： C. Vidaurre A. Schlogl R. Cabeza R. Scherer G. Pfurtscheller Department of Electrical Engineering and Electonics State University of Navarra Campus Arrosadia s/n Pamplona Spain Institute of Human-Computer Interfaces Department of Electrical Engineering and Electonics State University of Navarra Pamplona Spain BCI-Lab Institute for Computer Graphics Graz University of Technology Graz Austria

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Verification of scanned engineering parts with CAD models based on discrete curvature estimation

Verification of scanned engineering parts with CAD models ba...

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作者： Lipshitz, B. Fischer, A. Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

The manufacturing industry constantly needs to verify machined objects against their original CAD models. Given a prototype design, an engineer should be able to determine whether the part was manufactured well;that is, whether it fits the CAD model exactly. However, derivative computations are unstable for real data, and the estimated curvature is thus very sensitive to noise. Moreover, in many cases, spatial fitting of corresponding points is not sufficient. The current work utilizes the curvature properties to inspect manufactured parts that have been reconstructed from noisy and densely sampled data. Copyright © 2005 by ASME.

关键词： computer aided design

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Comparing different teaching models in a first year computer aided design course

Comparing different teaching models in a first year computer...

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2005 ASEE Annual Conference and Exposition: The Changing Landscape of engineering and Technology Education in a Global World

作者： Baxter, Douglas H. Mandigo, Andrew CAD/CAM/CAE United States Engineering Graphics and Computer Aided Design Course School of Engineering Rensselaer Polytechnic Institute United States CAD/CAM/CAE School of Engineering Rensselaer Polytechnic Institute United States

The comparison of different teaching models in a first year CAD course is presented. The course, engineering graphics and computer Aided Design (EG&CAD) teaches the skills of using a solid modeling system to create parts, small assemblies, and documentation. EG&CAD is taught with a series of twelve one hour lectures over a fourteen week semester. The new model of using assembly for the entire semester is proving successful. Moreover, quizzes will no longer be drawn from the final project instead, from other sources.

关键词： computer aided design

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Robust active appearance model matching

Robust active appearance model matching

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19th International Conference on Information Processing in Medical Imaging, IPMI 2005

作者： Beichel, Reinhard Bischof, Horst Leberl, Franz Sonka, Milan Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16/2 A-8010 Graz Austria Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 United States

A novel robust active appearance model (AAM) matching algorithm is presented. The method consists of two main stages. First, initial residuals are clustered by a non parametric mean shift mode detection step. Second, modes without gross outliers are selected using an objective function. Robustness of the matching procedure is demonstrated on a variety of examples with different noise conditions. The proposed algorithm outperformed the conventional AAM matching on images with gross disturbances and can tolerate up to 40% of disturbed data. © Springer Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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Profile flags: A novel metaphor for probing of T2 maps

Profile flags: A novel metaphor for probing of T2 maps

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VIS 05: IEEE Visualization 2005, Proceedings

作者： Mlejnek, Matej Ermes, Pierre Vilanova, Anna Van Rijt, Rob Der Van Bosch, Harrie Den Gerritsen, Frans Gröller, Meister Eduard Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Philips Medical Systems Best Netherlands Department of Biomedical Engineering Technische Universiteit Eindhoven Netherlands Catharina Hospital Eindhoven Netherlands

ISBN: (纸本)0780394623

This paper describes a tool for the visualization of T2 maps of knee cartilage. Given the anatomical scan and the T2 map of the cartilage, we combine the information on the shape and the quality of the cartilage in a single image. The Profile Flag is an intuitive 3D glyph for probing and annotating of the underlying data. It comprises a bulletin board pin-like shape with a small flag on top of it. While moving the glyph along the reconstructed surface of an object, the curve data measured along the pin's needle and in its neighborhood are shown on the flag. The application area of the Profile Flag is manifold, enabling the visualization of profile data of dense but inhomogeneous objects. Furthermore, it extracts the essential part of the data without removing or even reducing the context information. By sticking Profile Flags into the investigated structure, one or more significant locations can be annotated by showing the local characteristics of the data at that locations. In this paper we are demonstrating the properties of the tool by visualizing T2 maps of knee cartilage. © 2005 IEEE.

关键词： Cartilage

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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 label 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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