An approach based on a mathematical formalization of desirable properties of pictures is presented for correcting several types of perceived geometric distortions in computer-generated and photographic images. Percept...
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ISBN:
(纸本)9780897917018
An approach based on a mathematical formalization of desirable properties of pictures is presented for correcting several types of perceived geometric distortions in computer-generated and photographic images. Perceptually preferable viewing transformations are obtained from a small set of simple assumptions and shown to be decomposed into a perspective or parallel projection followed by a planar transformation. Following this, it is proven that two perceptually important properties are incompatible and cannot be satisfied simultaneously. By implementing the proposed transformations to computer-generated and photographic perspective projection images, it is found that the transformations considerably reduced distortion in wide-angle motion pictures and computer-generated animations.
This paper describes how evolutionary techniques of variation and selection can be used to create complex simulated structures, textures, and motions for use in computergraphics and animation. interactive selection, ...
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We have developed a system for interactive manipulation of shading parameters for three dimensional rendering. The system takes as input user-defined shaders, written in a subset of C, which are then specialized for i...
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ISBN:
(纸本)9780897917018
We have developed a system for interactive manipulation of shading parameters for three dimensional rendering. The system takes as input user-defined shaders, written in a subset of C, which are then specialized for interactive use. Since users typically experiment with different values of a single shader parameter while leaving the others constant, we can benefit by automatically generating a specialized shader that performs only those computations depending on the parameter being varied;all other values needed by the shader can be precomputed and cached. The specialized shaders are as much as 95 times faster than the original user defined shader. This dramatic improvement in speed makes it possible to interactively view parameter changes for relatively complex shading models, such as procedural solid texturing.
The need to visualize huge amounts of numerical data is exemplified in the field of meteorology, where measurements of many atmospheric parameters are routinely taken over large geographical areas for the purpose of m...
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Many interesting surfaces can be written as polynomial functions of the spatial coordinates, often of low degree. We present a method based on a ray casting algorithm, extended to work in more than three dimensions, t...
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techniques for computer modeling of electrical distribution systems have been available to utility engineers for years. The formation of a distribution data base can be a huge task because of the enormous number of co...
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ISBN:
(纸本)0897910214
techniques for computer modeling of electrical distribution systems have been available to utility engineers for years. The formation of a distribution data base can be a huge task because of the enormous number of components in a utility's distribution system. The continuous changes that occur in a distribution system make data base maintenance difficult. Application of computergraphics to distribution engineering simplifies data base formation and maintenance and AIDS in interpreting the results of analysis. Graphic-aided distribution analysis allows the engineer to quickly see the results of alternate modes of system operations, thus speeding the iterative process of decisionmaking. Future applications for graphicstechniques in utilities extend to distribution SCADA, work order preparation and protective device coordination. � acm. All rights reserved.
作者：
Endo, TakumiArtist
14-4-401 Sumiyoshi-cho Shinjuku Tokyo 1620065 Japan
TypeTrace is an interactive application that records all the keyboard strokes you make, similar to Spyware. The application plays back the writing along a timeline just like a movie.
ISBN:
(纸本)9781595937025
TypeTrace is an interactive application that records all the keyboard strokes you make, similar to Spyware. The application plays back the writing along a timeline just like a movie.
Shadow maps are probably the most widely used means for the generation of shadows, despite their well known aliasing problems. In this paper we introduce perspective shadow maps, which are generated in normalized devi...
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ISBN:
(纸本)9781581135213
Shadow maps are probably the most widely used means for the generation of shadows, despite their well known aliasing problems. In this paper we introduce perspective shadow maps, which are generated in normalized device coordinate space, i.e., after perspective transformation. This results in important reduction of shadow map aliasing with almost no overhead. We correctly treat light source transformations and show how to include all objects which cast shadows in the transformed space. Perspective shadow maps can directly replace standard shadow maps for interactive hardware accelerated rendering as well as in high-quality, offline renderers.
It is important to improve the aesthetics and effectiveness of information graphics through greater awareness of graphic design as a visual communication discipline. Chart making is one subject area in which graphic d...
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ISBN:
(纸本)0897910214
It is important to improve the aesthetics and effectiveness of information graphics through greater awareness of graphic design as a visual communication discipline. Chart making is one subject area in which graphic design awareness can be enhanced. Basic design principles are reviewed which are relevant to creating better charts. Examples demonstrate improvements. � acm. All rights reserved.
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