Non-Photorealistic Computer Graphics Library

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Found 10 item(s) authored by "John W. Buchanan" Find Author on Google.

Proceedings Comprehensive Halftoning of 3D Scenes

Author(s): Oleg Veryovka, John W. Buchanan.
Proceedings: Skiggraph '99, 1999.
[BibTeX] Find this paper on Google

The display of images on binary output hardware requires a halftoning step. Conventional halftoning algorithms approximate image values independently from the image content and often introduce artificial texture that obscures fine details. The objective of this research is to adapt a halftoning technique to 3D scene information and thus to enhance the display of computer generated 3D scenes. Our approach is based on the control of halftoning texture by the combination of ordered dithering and error diffusion techniques. We extend our previous work and enable a user to specify the shape, scale, direction, and contrast of the halftoning texture using an external buffer. We control texture shape by constructing a dither matrix from an arbitrary image or a procedural texture. Texture direction and scale are adapted to the external information by the mapping function. Texture contrast and the accuracy of tone reproduction are varied across the image using the error diffusion process. We halftone images of 3D scenes by using the geometry, position, and illumination information to control the halftoning texture. Thus, the texture provides visual cues and can be used to enhance the viewer’s comprehension of the display.

Proceedings Computer-Generated Pencil Drawing
Mario Costa Sousa, John W. Buchanan.
Skiggraph '99, 1999. [BibTeX]

Proceedings Edge enhancement issues in halftoning
John W. Buchanan, Lisa M. Streit, Oleg Veryovka.
Graphics Interface (GI'98), pp. 209--216, 1998. [BibTeX]

Proceedings Halftoning with Image-Based Dither Screens
Oleg Veryovka, John W. Buchanan.
Graphics Interface (GI'99), 1999. [BibTeX]

Article Importance Driven Halftoning
Lisa M. Streit, John W. Buchanan.
Computer Graphics Forum (EG'98), Vol. 17, No. 3, 1998. [BibTeX]

Proceedings Non-photorealistic Rendering Using an Adaptive Halftoning Technique
Lisa M. Streit, Oleg Veryovka, John W. Buchanan.
Skiggraph '99, 1999. [BibTeX]

Proceedings Observational Model of Blenders and Erasers in Computer-Generated Pencil Rendering
Mario Costa Sousa, John W. Buchanan.
Proceedings of Graphics Interface (GI'99), pp. 157--166, 1999. [BibTeX]

Article Observational Models of Graphite Pencil Materials
Mario Costa Sousa, John W. Buchanan.
Computer Graphics Forum, Vol. 19, No. 1, pp. 27--49, March, 2000. [BibTeX]

Article Special Effects with Half-Toning
John W. Buchanan.
Computer Graphics Forum, Vol. 15, No. 3, pp. 97--108, 1996. [BibTeX]

Proceedings The edge buffer: A data structure for easy silhouette rendering
John W. Buchanan, Mario Costa Sousa.
1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 39--42, Annecy, France, June 05 - 07, 2000. [BibTeX]

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