Generating an image

Details Generating an image Generating an image

1991-06-28

1995-02-28

Jankus, Almis

395128, 395132, G06F 1562

Patent

active

053945166

ABSTRACT:
An image of objects in a three dimensional space is generated for display on a two dimensional regular pixel array by offset and span generations (OFGN, SPGN) for anti-alias filtering which causes multiple rendition of the image, with each rendition displaced by a sub-pixel offset (Nx,Ny) with respect to the previous rendition. Image primitives are rendered by a scan line algorithm using a linked active polygon list (APL) and a deleted polygon list (DPL) to enable vertical offsets to be effected. The deleted polygon list stores primitives which would not be effective for a given line but for the offset to enable anti-alias filtering. These polygons would not normally be available for processing when using the scan line algorithm. Economical hardware (600) is provided for horizontal edge correction of parameters such as depth (z) and texture coordinates (u,v).

REFERENCES:
patent: 5019903 (1991-05-01), Dougall et al.
patent: 5025400 (1991-06-01), Cook et al.
patent: 5287438 (1994-02-01), Kelleher
W. Strasser, "A VLSI Oriented Architecture for Parallel Processing Image Generation" Proceedings of the IFIP EG 10.3 Working Conference on Highly Parallel Computers for Num. and Sign. Proc. App. Mar. 1986, pp. 247-258.
"Fast Spheres, Shadows, Textures, Transparencies and Image Enhancements in Pixel-Planes"; Fuchs et al; Computer Graphics, vol. 19, No. 3 pp. 111-120 (1985).
"A Hidden-Surface Algorithm with Anti-Aliasing"; E. Catmull, Computer Graphics vol. 12, No. 3, pp. 6-11. (1978).
"The A-Buffer, An Antialiased Hidden Surface Method", L. Carpenter, Computer Graphics, vol. 18, No. 3, pp. 103-108. (1984).
"A Survey of Texture Mapping", Heckbert; IEEE Computer Graphics and Applications, Nov. 1986 pp. 56-67.

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