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IEEE Computer Graphics and Applications

Issue 5 • Sept. 1991

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Displaying Results 1 - 8 of 8
  • Visualization Blackboard-visualizing 3D PET images

    Publication Year: 1991, Page(s):11 - 13
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (178 KB)

    Characteristics of positron emission tomography (PET) images that limit human ability to accurately perceive the information the images contain are discussed. They are relatively low spatial resolution, a lack of apparent anatomical information and the expression of metabolic activity in terms of brightness levels (gray levels), which are not efficiently determined by the human visual system. Thes... View full abstract»

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  • Dithering for 12-bit true-color graphics

    Publication Year: 1991, Page(s):18 - 29
    Cited by:  Papers (5)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1171 KB)

    Three approaches that together improve the quality of dithered images by decreasing the intensity error and distributing the remaining quantization error more effectively, both spatially and across the intensity range, are described. The first method improves the intensity error distribution. The second method, which is complementary to the first, improves the quality of low-intensity vectors and ... View full abstract»

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  • Complex models for animating synthetic actors

    Publication Year: 1991, Page(s):32 - 44
    Cited by:  Papers (23)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1219 KB)

    A classification of models for animating synthetic actors is proposed. The classification depends on the motion control method used (geometric, physical, or behavioral) and the type of actor interaction (single actor, actor-actor, actor-environment, and animator-actor). These interactions and models give rise to a classification array with four rows and three columns. Each case represents existing... View full abstract»

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  • Generic sign systems in medical imaging

    Publication Year: 1991, Page(s):46 - 65
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1577 KB)

    An approach to summarizing and understanding medical image data sets is presented. It is a general, mathematically based method for building sign systems that uses differentiable topology and semiotics. The semiotics of medical imaging is first examined, covering display requirements, control parameters, icons and topological constraints, and signs and data reduction. The general approach is then ... View full abstract»

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  • Surface coding based on Morse theory

    Publication Year: 1991, Page(s):66 - 78
    Cited by:  Papers (126)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1498 KB)

    Coding system requirements are briefly discussed. Classical Morse theory, which was primarily motivated by the calculus of variations, is reviewed. The limits of the theory are examined, and an extension that enables 3-D surfaces to be accurately reconstructed from cross sections is presented. The resulting coding works interactively with a range of surface reconstruction systems. The prototype co... View full abstract»

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  • Front-to-back display of BSP trees

    Publication Year: 1991, Page(s):79 - 85
    Cited by:  Papers (22)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A technique for displaying binary space partitioning (BSP) trees that is faster than the usual back-to-front display method is presented. By combining polygon scan-conversion with a dynamic screen data structure, the technique, a front-to-back approach, provides significant speedup in the display time of polygonal scenes that depend on BSP trees, especially in cases where the number of polygons is... View full abstract»

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  • Jim Blinn's Corner-a trip down the graphics pipeline: subpixelic particles

    Publication Year: 1991, Page(s):86 - 90
    Cited by:  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Reasons for subdividing pixels into subpixelic particles are discussed. Working with subpixel resolution in the floating-point domain is suggested as the easiest approach. To illustrate the use of floating-point pixel space, the arithmetic of two rendering algorithms is reviewed. The algorithms are an antialiased line renderer and a simple polygon tiler. Another use for subpixel resolution, i.e., ... View full abstract»

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  • Virtual reality dominates siggraph [selective update]

    Publication Year: 1991, Page(s):14 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (875 KB)

    Virtual reality, achievement awards, and refining computer graphics techniques were the focus of this year??s Siggraph conference in Las Vegas, Nevada. From July 28 through August 2, the 18th annual international conference on computer graphics and interactive techniques attracted 23,100 people to the desert town to view some of the latest computer graphics products, technology, and applications. View full abstract»

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Aims & Scope

IEEE CG&A bridges the theory and practice of computer graphics. From specific algorithms to full system implementations, CG&A offers a unique combination of peer-reviewed feature articles and informal departments, including product announcements.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
L. Miguel Encarnação
The QED Group