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VisOK: a flexible visualization system for distributed Java object application

VisOK: a flexible visualization system for distributed Java ...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Dong-Woo Lee R.S. Ramakrishna Parallel Computing & Computer Graphics Laboratory Gwangju Institute of Science and Technology Kwangju South Korea

Distributed object systems are known to be very complex. Consequently it is very difficult, if not impossible, to see the overall relationship among participating objects in the system. That complicates the issues connected with performance tuning and maintenance. An economical way to visualize the system is clearly needed. In this paper, we propose a tracing facility for Java-based distributed object system, especially Java RMI (Remote Method Invocation). Our visualization system VisOK (Visual Object-Kit) uses two-phase hybrid post-mortem/on-the-fly technique. The fundamental tracing part has a flexible and dynamic mechanism. The main idea behind the tracing technique is the plug-in sensor model (PSM). There is a close relationship between tracing part and the visualization part. For effective visualization of a working system, the causality of events has to be preserved VisOK supports global event ordering. And for collecting and assembling local states of objects, we propose a distributed snapshot algorithm.

关键词： Visualization Java Electrical capacitance tomography Hip Debugging Data mining Instruments Application software Parallel processing computer graphics

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A genetic algorithm for the biconnectivity augmentation problem

A genetic algorithm for the biconnectivity augmentation prob...

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Congress on Evolutionary Computation

作者： I.D. Ljubic J.J. Kratica Institute for Computer Graphics University of Technology Vienna Vienna Austria Institute for Mathematics Belgrade Serbia

In this paper we present a genetic algorithm (GA) for the NP-hard biconnectivity problem for graphs. Suppose a 2-connected, undirected weighted graph G(V,E) and a spanning subset of edges E/sub 0//spl sub/E are given. The goal is to augment set E/sub 0/ with a set AUG/spl sub/E-E/sub 0/ of minimal weight, such that graph G(V,E/sub 0//spl cup/AUG) is biconnected. To our knowledge, this is the first time a GA is applied to this problem. First, a straight-forward "pure" GA improved with caching is introduced, which is then hybridized with a greedy, problem dependent heuristic. The proposed approaches are problem instances with up to 1160 feasible edges. While the pure GA performs well, significantly better solutions can be obtained by the hybrid strategy.

关键词： Genetic algorithms Robustness Polynomials Joining processes computer graphics Testing Algorithm design and analysis Communication networks Mathematics Very large scale integration

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Tournament selection for browsing temporal signals 00

Tournament selection for browsing temporal signals

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Proceedings of the 2000 ACM symposium on Applied computing - Volume 2

作者： Ik Soo Lim Daniel Thalmann Computer Graphics Lab (LIG) Swiss Federal Institute of Technology (EPFL) CH-1015 Lausanne Switzerland

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AlVis - An aluminium-foam visualization and investigation tool

AlVis - An aluminium-foam visualization and investigation to...

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2nd Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2000

作者： König, Andreas H. Doleisch, Helmut Kottar, Andreas Kriszt, Brigitte Gröller, Eduard Institute of Computer Graphics Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria Institute of Experimental Physics Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria Department of Material Science and Testing Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria

ISBN: (纸本)3211835156

In recent years there has been an increased interest in metal foams in the field of material science. The stress absorbing potential is one of the most interesting properties for the application of aluminium foam (e.g. car manufacturing). Material scientists need to investigate the structure of metal foams in order to optimize their deformation behavior. An interactive tool for the investigation is presented in this work. Real-time surface rendering, automatic parameter determination, and display of local and global foam properties enable the user to understand the complex structure of the metal foam. © 2000 Eurographics Association. All rights reserved.

关键词： Aluminum

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The augmented man

The augmented man

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IEEE and ACM International Symposium on Augmented Reality

作者： D. Stricker T. Frohlich C. Soller-Eckert Fraunhofer Institute of Computer Graphics Research (IGD) Darmstadt Germany Media Design and Media Technology Mainz Germany

"The augmented man" presents a vision of a new media technology, blending real and virtual worlds, and has been developed in the context of an artistic exhibition. The visitor meets a virtual man, who seems to have emotions and who tries to get in contact by talking and asking questions. The application consists of augmented stereo videos, which are projected on a wall projection screen. The visitor sees himself as if in a 3D mirror, but with a new virtual person walking beside him. The augmented man reacts to people by approaching them or avoiding them. This paper gives a complete overview of the exhibition and presents the artistic concepts and the technical realization. After explanations about our motivation and background ideas, the modelling and the behavioural coding of the virtual man are described. Rendering aspects, like multi-texturing and 3D augmented videos are discussed in detail. The determination of the positions of the visitors is achieved by processing the images of a camera fixed on the room's ceiling. Combined with the stereo front-facing cameras, we show how occlusions between the real person and the virtual man can be handled. The system works in real-time on a single machine with three video input streams and two graphic outputs.

关键词： Videos Space technology Cameras computer graphics Mirrors Educational institutions Legged locomotion Rendering (computer graphics) Real time systems Streaming media

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Radar image processing with clusters of computers

Radar image processing with clusters of computers

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IEEE Conference on Aerospace

作者： A. Goller F. Leberl Chalmers University of Technology Gothenburg Sweden Institute for Computer Graphics and Vision Technical University of Graz Graz Austria

Some radar image processing algorithms such as shape-from-shading are particularly compute-intensive and time consuming. If, in addition, a data set to be processed is large, then it may make sense to perform the processing of images on multiple workstations or parallel processing systems. We have implemented shape-from-shading, stereo matching, resampling, gridding and visualization of terrain models in such a manner that they execute either on parallel machines or on clusters of workstations. We were motivated by the large image data set from NASA's Magellan mission to planet Venus, but received additional inspiration from the European Union's Center for Earth Observation program (CEO) and Austria's MISSION initiative for distributed processing of remote sensing images on remote workstations, using publicly accessible algorithms. We have developed a multi-processor approach that we denote as CDIP for Concurrent and Distributed Image Processing. The speedup for image processing tasks increases nearly linearly with the number of processors, be they on a parallel machine or arranged in a cluster of distributed workstations. Our approach adds benefits for users of complex image processing algorithms: the efforts for code porting and code maintenance are reduced and the necessity for specialized parallel processing hardware is eliminated.

关键词： Radar imaging Image processing Workstations Clustering algorithms Parallel processing Parallel machines Data visualization Planets Venus Earth

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A novel bidirectional framework for control and refinement of area based correlation techniques

A novel bidirectional framework for control and refinement o...

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15th International Conference on Pattern Recognition, ICPR 2000

作者： Werth, Peter Scherer, Stefan Erich-Schmid-Institute for Materials Science Austrian Academy of Sciences Jahnstr. 12 LeobenA-8700 Austria Computer Graphics and Vision Graz University of Technology Inffeldgasse 16/2 GrazA-8010 Austria

ISBN: (纸本)0769507506

A key issue in performing stereo reconstruction is to find stereo correspondences. For this purpose a novel unified framework for arbitrary area based correlation methods is presented. The commonly neglected problem of ambiguities is addressed and a solution based on relaxation of match candidates is introduced. The method comes with the major benefits of a reverse matching step at almost no extra computational cost. The results of one match direction is used to select match candidates. Then these candidates are correlated backward with a different method. The proposed framework does not require any initial estimations. Experiments are performed on ground truth under varying geometric and varying noise conditions. Finally the method is compared to a number of well known techniques. © 2000 IEEE.

关键词： Correlation methods

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SinusCone /spl Theta//spl Phi/-a ThetaPhi algorithm for human arm animation

SinusCone /spl Theta//spl Phi/-a ThetaPhi algorithm for huma...

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International Conference on Information Visualisation (IV)

作者： Huang Jing E.C. Prakash Center for Graphics and Image Technology Nanyang Technological University Singapore School of Computer Engineering Nanyang Technological University Singapore

Arm animation algorithms are often categorized by their constraint expansion strategy. One option is the geometric bounding polygon-cone strategy, a simple containment search strategy that traverses the search space in the order in which successor bounding polygon edges are generated. An alternative is the ThetaPhi-cone strategy, which was designed to make it possible to use domain-specific heuristic information. By exploring promising parts of the cone space first, ThetaPhi-cone algorithms generally are more efficient than polygon-cone algorithms.

关键词： Humans Animation Shoulder Space technology Databases graphics Motion control Shape Interpolation Biological system modeling

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3D model based pose determination in real-time: strategies, convergence, accuracy

3D model based pose determination in real-time: strategies, ...

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International Conference on Pattern Recognition

作者： M. Berger T. Auer G. Bachler S. Scherer A. Pinz Computer Graphics and Vision Graz University of Technology Graz Austria Institute of Electrical Measurement and Measurement Signal Processing Graz University of Technology Graz Austria

ISBN: (纸本)0769507506

In this paper, a new real-time model based pose determination system based on the Gauss-Newton method is described. Various model fitting strategies, which use gradient search, are discussed and compared. A novel strategy, the adaptive perpendicular search, is proposed for both matching ambiguity avoidance and convergence enforcement. The system is shown to be highly effective in practice, while keeping the computational cost low. A sufficient initial pose estimate as an input for the Gauss-Newton based methods is obtained from the parametric eigenspace. With certain restrictions, the overall pose determination system performs in real-time, as required in industrial applications.

关键词： Convergence Least squares methods Newton method Recursive estimation Real time systems Optimization methods Robustness Electric variables measurement Computational efficiency computer industry

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SQUEEZE: fast and progressive decompression of triangle meshes

SQUEEZE: fast and progressive decompression of triangle mesh...

引用

computer graphics International

作者： R. Pajarola J. Rossignac Information & Computer Science University of California Irvine USA Graphics Visualization & Usability Center College of Computing Georgia Institute of Technology USA

An ideal triangle mesh compression technology would simultaneously support the following objectives: (1) progressive refinements of the received mesh during decompression, (2) nearly optimal compression ratios for both geometry and connectivity, and (3) in-line, real-time decompression algorithms for hardware or software implementations. Because these three objectives impose contradictory constraints, previously reported efforts have focused primarily on one (sometimes two) of these objectives. The SQUEEZE technique introduced in this paper addresses all three constraints simultaneously, and attempts to provide the best possible compromise. For a mesh of T triangles, SQUEEZE compresses the connectivity to 3.7T bits, which is competitive with the best progressive compression techniques reported so far. The geometric prediction error encoding technique introduced in this paper leads to a geometry compression that is improved by 20% over that of previous schemes. Our initial implementation on a 300-MHz CPU achieved a decompression rate of up to 46,000 triangles per second. SQUEEZE downloads a model through a number of successive refinement stages, providing the benefit of progressivity.

关键词： Hardware Encoding Bandwidth Geometry Image coding Shape Solid modeling computer science computer graphics Visualization

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