IEEE Computer Graphics and Applications

Issue 5 • Sept. 1990

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Displaying Results 1 - 7 of 7
  • Techniques for cubic algebraic surfaces

    Publication Year: 1990, Page(s):12 - 21
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (885 KB)

    A survey of some techniques that may have potential for free-form modeling with algebraic surfaces is continued. Classical results as well as several recent innovations are included. Specific attention is paid to cubic algebraic surfaces, although many of the ideas presented have application to algebraic surfaces of any degree. Topics addressed include piecewise constructions, interpolation to poi... View full abstract»

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  • Recognizing shape features in solid models

    Publication Year: 1990, Page(s):22 - 32
    Cited by:  Papers (57)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (934 KB)

    A procedure for defining and recognizing shape features 3-D solid models is presented in which a shape feature is defined as a single face or a set of continuous faces possessing certain characteristic facts in topology and geometry. The system automatically extracts these facts from an example shape feature interactively indicated by the user. The resulting representation of the shape feature can... View full abstract»

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  • Surface mapping brain function on 3D models

    Publication Year: 1990, Page(s):33 - 41
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (945 KB)

    A flexible graphics system for displaying functional and anatomic data on arbitrary collections of surfaces on or within the brain is presented. The system makes it possible to show complex, convoluted surfaces with the shading cues necessary to understand their shapes; to vary viewpoint, object position, illumination, and perspective easily; to show multiple-objects in one view, with or without t... View full abstract»

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  • Accurate rendering by subpixel addressing

    Publication Year: 1990, Page(s):45 - 53
    Cited by:  Papers (10)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (758 KB)

    A simple method is presented for eliminating most pixel-positioning errors when rendering lines and polygons with J.E. Bresenham's algorithm (see IBM Syst. J., vol.4, no.1, p.25-30 (1965)). The method affects only the calculation of the initial values for Bresenham's vector-generating algorithm. It does not alter the actual vector-generating algorithm, requiring only inter arithmetic to find the n... View full abstract»

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  • Line-drawing algorithms for parallel machines

    Publication Year: 1990, Page(s):54 - 59
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (732 KB)

    The fact that conventional line-drawing algorithms, when applied directly on parallel machines, can lead to very inefficient codes is addressed. It is suggested that instead of modifying an existing algorithm for a parallel machine, a more efficient implementation can be produced by going back to the invariants in the definition. Popular line-drawing algorithms are compared with two alternatives; ... View full abstract»

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  • Parallelization of Bresenham's line and circle algorithms

    Publication Year: 1990, Page(s):60 - 67
    Cited by:  Papers (18)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (889 KB)

    Parallel algorithm for line and circle drawing that are based on J.E. Bresenham's line and circle algorithms (see Commun. ACM, vol.20, no.2, p.100-6 (1977)) are presented. The new algorithms are applicable on raster scan CRTs, incremental pen plotters, and certain types of printers. The line algorithm approaches a perfect speedup of P as the line length approaches infinity, and the circle algorith... View full abstract»

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  • Vector versus raster: a functional comparison of drawing technologies

    Publication Year: 1990, Page(s):68 - 80
    Cited by:  Papers (3)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1373 KB)

    Raster drawing systems have emerged as an alternative to more traditional vector-based CAD drafting systems. With engineering drawing in mind, the author compares the functional capabilities of these technologies and explores means for integrating the best features of both. The characteristics examined are not those of any particular raster or vector implementation but are derived from the underly... 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.

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