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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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SQUEEZE: fast and progressive decompression of triangle meshes

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

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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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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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International Conference on Pattern Recognition

作者： P. Werth S. Scherer Computer Graphics and Vision Graz University of Technology Graz Austria Erich-Schmid-Institute for Materials Science Austrian Academy of Sciences Leoben 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.

关键词： Stereo image processing Correlation Image matching Noise robustness Materials science and technology Image reconstruction Computational efficiency Stereo vision computer graphics Computational complexity

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Robust subpixel stereo matching by relaxation of match candidates

Robust subpixel stereo matching by relaxation of match candi...

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International Symposium on Image and Signal Processing and Analysis

作者： P. Werth S. Scherer Computer Graphics and Vision Graz University of Technology Graz Austria Erich-Schmid-Institute for Materials Science Austrian Academy of Sciences Leoben Austria

ISBN: (纸本)9539676924

A key issue in performing quantitative measurements in stereoscopic images is the problem of establishing stereo correspondence. For this purpose a novel two step algorithm is presented. The commonly neglected problem of ambiguities is addressed and a solution based on the relaxation of match candidates is introduced. The method comes with the major benefits of a reverse matching step at almost no additional computational cost and requires no initial estimations or constraints. The results of both match directions are re-used for a robust subpixel refinement. Experiments are performed on ground truth and a comparison to other well known, techniques is presented. The method performs best on real images, but not under all of the used noise conditions.

关键词： Signal processing algorithms World Wide Web Noise robustness computer graphics Materials science and technology Performance evaluation Computational efficiency Geometry Image matching Electrons

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Intuitive virtual grasping for non haptic environments

Intuitive virtual grasping for non haptic environments

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Pacific Conference on computer graphics and Applications

作者： T. Ullmann J. Sauer Department of Computer Science and Automation Computer Graphics Program Technical University Ilmenau Ilmenau Germany Commercial Vehicle Development DaimlerChrysler Aerospace Sindelfingen Germany Virtual Reality Competence Center Daimler Chrysler Research and Technology Center Ulm Germany

This paper presents an approach for grasping virtual objects in virtual environments with a data glove. Our focus lies on developing new methods that allow sensible realistic grasping gestures which correspond to human grasping behavior. To meet the demands of industrial applications, users must be able to grasp an object in an intuitive way with one or two hands and, beyond that, manipulate grasped objects between their fingers. To avoid the use of expensive force or touch feedback hardware, but also to ensure a safe grip on virtual objects, several forms of visual feedback are provided. First, we describe the basic algorithm for grasping with one or two hands and finally, we present a method to precisely manipulate the grasped objects between the virtual fingers.

关键词： Grasping Haptic interfaces Data gloves Virtual reality Virtual environment Fingers Force feedback Hardware Application software Engines

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Provably good global buffering using an available buffer block plan

Provably good global buffering using an available buffer blo...

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IEEE International Conference on computer-Aided Design

作者： F.F. Dragan A.B. Kahng I. Mandoiu S. Muddu A. Zelikovsky Department of Computer Science University of California Los Angeles Los Angeles CA USA College of Computing Georgia Institute of Technology Atlanta GA USA Silicon Graphics Inc. Mountain View CA USA Department of Computer Science Georgia State University Atlanta GA USA

To implement high-performance global interconnect without impacting the performance of existing blocks, the use of buffer blocks is increasingly popular in structured-custom and block-based ASIC/SOC methodologies. Recent works by Cong et al. (1999) and Tang and Wong (2000) give algorithms to solve the buffer block planning problem. In this paper we address the problem of how to perform buffering of global nets given an existing buffer block plan. Assuming that global nets have been already decomposed into two-pin connections, we give a provably good algorithm based on a recent approach of Garg and Konemann (1998) and Fleischer (1999). Our method routes connections using available buffer blocks, such that required upper and lower bounds on buffer intervals-as well as wirelength upper bounds per connection-are satisfied. Our model allows more than one buffer to be inserted into any given connection. In addition, our algorithm observes buffer parity constraints, i.e., it will choose to use an inverter or a buffer (=co-located pair of inverters) according to source and destination signal parity. The algorithm outperforms previous approaches and has been validated on top-level layouts extracted from a recent high-end microprocessor design.

关键词： Repeaters Inverters computer science Integrated circuit interconnections Silicon Frequency estimation Delay estimation High performance computing computer graphics Application specific integrated circuits

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Granularity in the design of interactive illustrations 13

Granularity in the design of interactive illustrations

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13th SIGCSE Technical Symposium on computer science Education, SIGCSE 1999

作者： Gould, Daniel L. Simpson, Rosemary M. Van Dam, Andries Brown University NSF Science and Technology Center Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)9781581130850

We describe some issues in designing and building educational Java applets for an introductory computer graphics course. The design problem involves balancing educational goals of building intuition about fundamental concepts in a domain against heterogeneity both in subject material and in student backgrounds. We present our design approach for resolving these forces - fine-grained units addressing small concepts - and discuss its effects on other areas including hypertext structure, interface design, and software engineering. © 1999 ACM.

关键词： User interfaces

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Visualization by examples: Mapping data to visual representations using few correspondences

Visualization by examples: Mapping data to visual representa...

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1st Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 1999

作者： Alexa, Marc Müller, Wolfgang Darmstadt University of Technology Department of Computer Science Interactive Graphics System Group Rundeturmstr. 6 Darmstadt64283 Germany

ISBN: (纸本)9783709168035

In this paper we propose a new approach for the generation of visual scales for the visualization of scalar and multivariate data. Based on the specification of only a few correspondences between the data set and elements of a space of visual representations complex visualization mappings are produced. The foundation of this approach is the introduction of a multidimensional space of visual representations. The mapping between these spaces can be defined by approximating or satisfying the user defined relations between data values and visual atributes. © 1999 Eurographics Association. All rights reserved.

关键词： Visualization

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A multimodal interface framework for using hand gestures and speech in virtual environment applications 3rd

A multimodal interface framework for using hand gestures and...

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3rd International Gesture Workshop on Gesture-Based Communication in Human-computer Interaction, GW 1999

作者： Laviola, Joseph J. Brown University Site of the NSF Science and Technology Center Computer Graphics and Scientific Visualization PO Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)3540669353

Recent approaches to providing users with a more natural method of interacting with virtual environment applications have shown that more than one mode of input can be both beneficial and intuitive as a communication medium between humans and computer applications. Hand gestures and speech appear to be two of the most logical since users will typically be in environments that will have them immersed in a virtual world with limited access to traditional input devices such as the keyboard or the mouse. In this paper, we describe an ongoing research project to develop multimodal interfaces that incorporate 3D hand gestures and speech in virtual environments. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Virtual reality

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Determining the Lines Through Four Lines

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Journal of graphics tools 1999年第3期4卷 11-22页

作者： Michael Hohmeyer Seth Teller [a]Computer Graphics Group MIT LAb for Computer Science 545 Technology Square Cambridge MA 02139 E-mail: [b]ICEM CFD Engineering 2855 Telegraph Avenue #501 Berkeley CA 94705

This paper describes how to compute the line or lines which intersect four given lines in three dimensions. This intersection computation arises in computer graphics (for visibility computations), computational geomet...

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