Method and system for double error antialiasing in a computer di

Details Method and system for double error antialiasing in a computer di Method and system for double error antialiasing in a computer di

1992-09-22

1994-03-22

Herndon, Heather R.

395142, 395162, G06F 1562

Patent

active

052972445

ABSTRACT:
A method and system for generating an antialiased approximation of a line displayed within a data processing system having a raster-scan device for generating images within a two-dimensional grid comprising rows and columns of pixels. A plurality of parameters are generated according to Bresenham's algorithm for the line, including first error term and a second error term. A pixel intensity for an initial pixel for the pixel approximation of the line is generated. The first error term is compared with a threshold to determine an amount of error. The first error term is adjusted by a first selected amount in response to the comparison of the first error term, and the second error term is adjusted by a second selected amount in response to the comparison of the first error term. A pixel proximate to the initial pixel is selected by comparing the first adjusted error term with a second threshold to locate a pixel closest to a point on the line. The pixel is assigned a first intensity based on a comparison of the second adjusted error term with the first error term. Another pixel proximate to the pixel is selected in response to selecting the pixel. This another pixel is a assigned a second intensity based on a comparison of the second adjusted error term with the first error term.

REFERENCES:
patent: 4855935 (1989-08-01), Lien et al.
patent: 4873515 (1989-10-01), Dickson et al.
Computer Graphics Principles and Practice-Foley et al., pp. 72-91, 1990.

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