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 Title: |
US6292193:
Techniques for anisotropic texture mapping using multiple space-invariant filtering operations per pixel
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Perry, Ronald; Cambridge, MA
Jouppi, Norman P.; Palo Alto, CA
McCormack, Joel J.; Boulder, CO
Farkas, Keith Istvan; Menlo Park, CA
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| Assignee: |
Compaq Computer Corporation, Houston, TX
other patents from COMPAQ COMPUTER CORPORATION, INC. (755619) (approx. 2,058)
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| Published / Filed: |
2001-09-18
/ 1998-07-30
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| Application Number: |
US1998000126567
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| IPC Code: |
Advanced:
G06T 15/20;
Core:
G06T 15/10;
IPC-7:
G06T 11/40;
G06T 17/00;
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| ECLA Code: |
G06T15/00C;
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| U.S. Class: |
Current:
345/582;
345/428;
Original:
345/430;
345/428;
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| Field of Search: |
345/430,428
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| Priority Number: |
| 1998-07-30 |
US1998000126567 |
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| Abstract: |
A computer graphics system maps textures to displayed anti-aliased images with surfaces defined at oblique angles to the viewer. A circular pixel filter is projected onto a texture map to define an elliptical footprint in that texture map. The elliptical footprint has a major axis. Sample points are determined on a line in the footprint that closely approximates the major axis. These sample points are mapped to levels of detail and locations within a mip-map. Using a space-invariant filter, a texture value is computed for each sample point using data from one or more texture maps within the mip-map. These texture values for the sample points are post-filtered using a Gaussian filter function and summed to produce a final texture value. Blending the final texture with other characteristics of the pixel a produces the pixel data that are displayed on a display screen.
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| Attorney, Agent or Firm: |
Sherry, Leah ;
McRoss, LorenOppenheimer, Wolff & Donnelly ;
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| Primary / Asst. Examiners: |
Brier, Jeffery; Yang, Ryan
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| Maintenance Status: |
CC Certificate of Correction issued
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 35 claims |
We claim:
1. A computerized method for applying texture data representing a texture image to an object when rendering the object on a display device, the texture image being stored at varying levels of detail in a set of texture maps, each texture map being associated with one of the levels of detail, the method comprising:
- projecting a pixel onto one of the texture maps to define an elliptical footprint covering texture data in that texture map, the footprint having a major axis;
- determining sample points on a line in the footprint, the line closely approximating the major axis of the footprint;
- determining a level of detail for the center of the elliptical footprint;
- selecting at least one texture map from which to sample texture data at each sample point based on the level of detail; and
- sampling texture data at the sampling points to determine a texture value for each sample point, each texture value contributing to a final texture value for modifying the pixel.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 33 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other References: |
"Elliptical Gaussian Filters", S. Jackson and N. Ahuja, Proceedings of ICPR, 1996, pp. 775-779.*
Akeley et al., "Reality Engine Graphics" Computer Graphics, SIGGRAPH '93 Proceedings, pp 109-116, 1993.
Torborg et al., Talisman: Commodity Realtime 3D Graphics for the PC, Computer Graphics, SIGGRAPH '96 Proceedings, pp 353-364, 1996.
Schilling et al., "Texram: A Smart Memory for Texturing" IEEE Computer Graphics and Applications, pp 32-41, 1996.
(10 pages)
Cited by 19 patents
[ISI abstract]
Greene et al., "Creating Raster Omnimax Images from Multiple Perspective Views Using the Elliptical Weighted Average Filter", IEEE Computer Graphics and Applications, vol. 6, No. 6, pp 21-27, 1986.
(7 pages)
Cited by 29 patents
Heckbert et al., "Survey of Texture Mapping", IEEE Computer Graphics and Applications, vol. 6, No. 11, pp 56-67, 1986.
(12 pages)
Cited by 64 patents
Williams et al., "Pyramidal Parametrics", Computer Graphics, (SIGRAPH '83 Proceedings, pp 1-11, 1983.
Heckbert et al., "Fundamentals of Texture Mapping and Image Warping" Masters Thesis, Dept. of EECS, U. of California at Berkeley, Technical Report No. UCB/CSD 89/516, pp 1-86, 1989.
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