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Computer Graphics and Applications, IEEE

Issue 5 • Date Sept. 1993

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Displaying Results 1 - 10 of 10
  • Visualizing meteorological data for a lay audience

    Publication Year: 1993, Page(s):12 - 14
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The Triton system for visualizing meteorological data is discussed. Triton supports visualization of satellite data showing weather development in the past, scalar data such as temperature, snow height, or ozone concentration, vector data such as wind direction and strength, data related to cloud formations, contextual information such as geographical data, and additional information. A television... View full abstract»

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  • Automatic creation of 3D facial models

    Publication Year: 1993, Page(s):16 - 22
    Cited by:  Papers (60)  |  Patents (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    Model-based encoding of human facial features for narrowband visual communication is described. Based on an already prepared 3D human model, this coding method detects and understands a person's body motion and facial expressions. It expresses the essential information as compact codes and transmits it. At the receiving end, this code becomes the basis for modifying the 3D model of the person and ... View full abstract»

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  • Algorithms for manipulating compressed images

    Publication Year: 1993, Page(s):34 - 42
    Cited by:  Papers (56)  |  Patents (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (759 KB)

    A family of algorithms that implement operations on compressed digital images is described. These algorithms allow many traditional image manipulation operations to be performed 50 to 100 times faster than their brute-force counterparts. It is shown how the algebraic operations of pixel-wise and scalar addition and multiplication, which are the basis for many image transformations, can be implemen... View full abstract»

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  • Constraint-based curve manipulation

    Publication Year: 1993, Page(s):43 - 49
    Cited by:  Papers (14)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    Alternative techniques for control-vertex manipulation of parametric curves are described. Their generality and flexibility make possible a wide range of curve-editing interfaces based on direct manipulation. A method for applying systems of constraints at one or more arbitrary points on a single or composite curve and an efficient technique for the interactive application of these systems are out... View full abstract»

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  • Traversed geometric fractals

    Publication Year: 1993, Page(s):61 - 67
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    Two basic components are required for generating a geometric fractal: an initiator and a generator. Multiple traversal strategies for both initiator and generator segments are proposed. It is shown how to generate many fractal images by changing the traversal strategies for the given initiator and/or generator. These fractals are referred to as traversed geometric fractals. A notation for represen... View full abstract»

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  • G/sup 2/ blend surfaces and filling of N-sided holes

    Publication Year: 1993, Page(s):68 - 73
    Cited by:  Papers (4)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    An approach to obtaining curvature-continuous blends of any parametrically given surface is presented. The approach offers several options to control the shape of the blend through geometric continuity. It lets the designer define linkage curves arbitrarily as parametric curves in the respective parameter domains. Moreover, the proposed transfinite interpolant can be adopted to fill an n-sided pol... View full abstract»

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  • Increasing the apparent addressability of supersampling grids

    Publication Year: 1993, Page(s):74 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (358 KB)

    Nth bitting, a simple scheme for increasing apparent addressability in edge positioning of antialiased objects is presented. The method has application in combination with relatively coarse supersampling grids, providing much smoother edges. In contrast with the method developed by A. Schilling (1990), the extra information added along the edge is the highest frequency possible.<> View full abstract»

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  • Efficient shadow computations in ray tracing

    Publication Year: 1993, Page(s):78 - 83
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    Two techniques to speed up shadow computations in ray tracing are examined. The first, atomic adaptive sampling, is intended for any light type, such as directional, spot, point, linear, and area lights, in antialiasing, while the second, plane-vertex checking, specifically accelerates shadow computation of linear and area lights. The basic ideas can be extended to other ray types and, for the pla... View full abstract»

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  • Building a multimedia ISDN PC

    Publication Year: 1993, Page(s):24 - 33
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1055 KB)

    A personal-computer-based architecture that uses graphics methods to improve cooperative multimedia work over integrated services digital networks (ISDNs) is discussed. The system supports cooperative multimedia work by providing real-time video, graphics, and speech. The system requirements, components, and general architecture are considered, as is the implementation of the system.<> View full abstract»

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  • An algebra of geometric shapes

    Publication Year: 1993, Page(s):50 - 59
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (862 KB)

    A simple algebra of shapes with 2D planar regions is developed. The fact that a 2D region can be completely described by a one-dimensional, closed-boundary curve if it is homogeneous is used in the presented approach, which first converts the spatial description of the closed curve into an equivalent Fourier series description and then uses the Fourier-description to define binary composition oper... 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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Meet Our Editors

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