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IEEE Computer Graphics and Applications

Issue 2 • Date March 1990

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Displaying Results 1 - 8 of 8
  • Visualizing chaos: Lyapunov surfaces and volumes

    Publication Year: 1990, Page(s):15 - 19
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (607 KB)

    The use of a graphic technique to visualize chaos for a dual-parameter one-dimensional map is described. It involves plotting the Lyapunov exponent with both height and color in a three-dimensional map, as a function of the two parameters. Color is determined using a geographic lookup table. A graphics supercomputer can rotate the map in real time. The technique demonstrates graphically interestin... View full abstract»

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  • Volumetric rendering of computed tomography data: principles and techniques

    Publication Year: 1990, Page(s):24 - 32
    Cited by:  Papers (88)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    The methods and algorithms used for volumetric rendering of medical computed tomography data are described in detail. Volumetric rendering allows for the use of a mixture paradigm for representation of the volume to be rendered and uses mathematical techniques to reduce or eliminate aliasing. A step-by-step description of the process used to generate two types of images (unshaded and shaded surfac... View full abstract»

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  • A hybrid ray tracer for rendering polygon and volume data

    Publication Year: 1990, Page(s):33 - 40
    Cited by:  Papers (89)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (775 KB)

    Volume rendering, a technique for visualizing sampled functions of three spatial dimensions by computing 2-D projections of a colored semitransparent volume, is extended to handle polygonally defined objects. A hybrid ray-tracing algorithm, whereby rays are simultaneously cast through a set of polygons and a volume data array, is used. Samples of each are drawn at equally spaced intervals along th... View full abstract»

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  • Investigation of medical 3D-rendering algorithms

    Publication Year: 1990, Page(s):41 - 53
    Cited by:  Papers (110)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3046 KB)

    An investigation of the quality of surface-shading algorithms using computer-simulated test objects is reported. Test results are presented for four algorithms: z-buffer gradient, gray-level gradient, adaptive gray-level gradient, and marching cubes with two extensions. It was found that gray-level gradient shading and marching cubes did not differ greatly, except for thin objects, where adaptive ... View full abstract»

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  • Conformal image warping

    Publication Year: 1990, Page(s):54 - 61
    Cited by:  Papers (11)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1537 KB)

    Numerical and computer-graphic methods for conformal image mapping between two simply connected regions are described. The immediate motivation for this application is that the visual field is represented in the brain by mappings which are, at least approximately, conformal. Thus, to simulate the imaging properties of the human visual system (and perhaps other sensory systems), conformal image map... View full abstract»

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  • A general algorithm for oblique image reconstruction

    Publication Year: 1990, Page(s):62 - 65
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (630 KB)

    It is shown how to generate oblique slices from a set of parallel slices. An algorithm that can produce planes or contours through the volume without any loss of the volume resolution of the original data set is presented. The algorithm uses the Fourier-shift theorem and is efficient for calculating large numbers of slices. Although the algorithm is general, it is particularly well suited for thre... View full abstract»

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  • Computer modeling of surfaces with arbitrary shapes

    Publication Year: 1990, Page(s):67 - 77
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (874 KB)

    A detailed description is given of a local mathematical procedure for constructing a geometrically C/sup 1/ surface by interpolating a grid of cubic Bezier curves that meet in a quite general fashion (for example, they need not meet rectangularly). The constructed surface is a composite mosaic of independently parameterized tensor-product Bezier patches of different degrees (maximum of 6*6). Adjac... View full abstract»

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  • The truth about texture mapping

    Publication Year: 1990, Page(s):78 - 83
    Cited by:  Papers (2)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The author describes how the unique configuration of the planet Uranus influenced him to take a close look at how the layout of a texture map in memory affects the performance of the rendering algorithm. A planet rendering program that calculates, for each occupied pixel on the screen, the latitude and longitude visible at that pixel, is described. It uses this latitude and longitude to index into... View full abstract»

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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.

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Meet Our Editors

Editor-in-Chief
L. Miguel Encarnação
University of Iowa