Method and apparatus for antialiasing raster scanned images

Details Method and apparatus for antialiasing raster scanned images Method and apparatus for antialiasing raster scanned images

1993-10-06

1996-12-03

Nguyen, Phu K.

G06F 1500

Patent

active

055816800

ABSTRACT:
A method and apparatus for drawing at least a two pixel wide antialiased line is described in which the apparatus utilizes an interpolator, having a set up unit and an iterator unit, and a blender. The set up unit determines various parameters of the line to be drawn and selects a pair of pixels adjacent to and straddling an idealized line representing the line to be drawn. The iterator unit determines the coverages of the pair of pixels based on the parameters output by the set up unit. The blender determines the color intensity values of the pair of pixels as a function of the coverages and writes the color values into a memory. The memory is a frame buffer type memory utilized to drive a display and is split into at least four banks so that the color values of the pair of pixels can be simultaneously stored in different memory banks. The apparatus also incorporates a method for resolving accumulation error in the derivation of each pixel's position and a method for accommodating for the effect of a third intersected pixel on the line to be drawn.

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Sfarti "Antialiased Bresenham Lines for X Implementation", Computer Graphics, International, Tokyo, Jun. 26, 1992.

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