Anti-aliasing raster operations utilizing sub-pixel crossing inf

Details Anti-aliasing raster operations utilizing sub-pixel crossing inf Anti-aliasing raster operations utilizing sub-pixel crossing inf

1988-10-14

1990-03-13

Harkcom, Gary V.

Boots, shoes, and leggings

340728, 340723, 340744, 364518, G06F 1562, G09G 116

Patent

active

049087800

ABSTRACT:
A method and apparatus for performing anti-aliasing of rendered lines, text and images displayed by a workstation on a video display. The anti-aliasing is performed by logically dividing each addressable frame buffer pixel into sixteen sub-pixels and generating a gray scale value for the displayed pixel that is a function of the number of sub-pixels crossed by a portion of a rendered image. The invented circuitry is part of the circuitry used for combining source and destination data which forms the displayed image namely, an anti-aliasing mask and filter, adder/subtractor logic, saturation logic and anti-aliasing logic.

REFERENCES:
patent: 4402012 (1983-08-01), Knight
patent: 4586037 (1986-04-01), Rosener et al.
patent: 4704605 (1987-11-01), Edelson
patent: 4720705 (1988-01-01), Gupta et al.
patent: 4780711 (1988-10-01), Doumas
patent: 4808984 (1989-02-01), Trueblood et al.

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