By Topic

IEEE Computer Graphics and Applications

Issue 3 • May 1990

Filter Results

Displaying Results 1 - 9 of 9
  • A 'Notion' for interactive behavioral animation control

    Publication Year: 1990, Page(s):14 - 22
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1057 KB)

    Behavioral animation is a means for automatic motion control in which animated objects are capable of sensing their environment and determining their motion within it according to certain rules. An interactive method of behavioral animation in which the user controls motion by designing a network mapping sensor information to effectors is described. The system is called Notion. The network consist... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A note on the use of nonlinear filtering in computer graphics

    Publication Year: 1990, Page(s):23 - 29
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The application of nonlinear median and alpha-trimmed mean filters to computer graphics is discussed. The filters are simple to implement, do not require large amounts of CPU time to execute, and can be applied iteratively for better control over the filtering effects. A series of examples shows that the filters eliminate spike noise in a stochastic sampling application without smearing the final ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A real time particle system for display of ship wakes

    Publication Year: 1990, Page(s):30 - 35
    Cited by:  Papers (10)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB)

    The particle-system technique is used to model 'fuzzy objects', i.e. objects not bounded by well-defined, easily visible surfaces. the technique is used to depict, in real time, ship wakes in an air/sea simulation using a high-speed workstation for graphics calculation and display. The system consists of a graphics workstation tied to a compute server (typically a minicomputer, mainframe, or paral... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ray tracing mirages

    Publication Year: 1990, Page(s):36 - 41
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Ray-tracing methods are extended to include the mirage effect. This is accomplished by simulating atmospheric variations. Different air layers are distinguished in modeling the continuous spectrum of temperature change, each layer being assigned a refractive index, which causes a penetrating light ray to bend in accordance with Snell's law of refraction. A classification of mirage images is includ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computer-assisted surgery

    Publication Year: 1990, Page(s):43 - 51
    Cited by:  Papers (58)  |  Patents (138)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1222 KB)

    Computer-assisted surgery (CAS), a new navigation aid for skull-base surgery, is discussed. The system described combines 3-D coordinate measurement techniques, voxel processing methods, and pseudo-3-D image presentations to support preoperative planning of therapy, path-finding during the operation itself, and postoperative therapy control. The surgeon employs a hand-guided electromechanical 3-D-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Registration of 3D objects and surfaces

    Publication Year: 1990, Page(s):52 - 62
    Cited by:  Papers (32)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1175 KB)

    An approach to the problem of comparative analysis of objects and their surfaces that arises in medical imaging is presented and illustrated with an application to postsurgical bone-graft separation. A common requirement in medical imaging applications is the registration of multiple representations of the object prior to mensuration. The modeling of the registration process and the registration s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dealing with the ill-conditioned equations of motion for articulated figures

    Publication Year: 1990, Page(s):63 - 71
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    Realistic motion simulation for articulated figures has relied on the solution of linear systems of equations. Sometimes the solution of these equations presents a great deal of numerical difficulty, resulting in unrealistic or spurious motion for the figure or in excessive computation because of small integration intervals. The cause of the difficulty is shown to be related to the physical struct... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computing the arc length of parametric curves

    Publication Year: 1990, Page(s):72 - 78
    Cited by:  Papers (34)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Specifying constraints on motion is simpler if the curve is parameterized by arc length, but many parametric curves of practical interest cannot be parameterized by arc length. An approximate numerical reparameterization technique that improves on a previous algorithm by using a different numerical integration procedure that recursively subdivides the curve and creates a table of the subdivision p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Jim Blinn's corner-wonderful world of video [animation]

    Publication Year: 1990, Page(s):83 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    An overview of video animation for computer graphics is given. Signal timing, color encoding, tape formats, tracking, genlocking, time code, editing, VTR communication, and software are covered. Terminology is defined View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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