05594854 is referenced by 139 patents and cites 1 patents.

A graphics processing system in which sub-pixel correction is implemented in a new and more economical way. A half-pixel offset is originally imposed on both the X and Y axes, so the sub-pixel correction value may be positive or negative. A relatively coarse resolution is used for subpixel correction, so that the DDAs (and other functional blocks) do not have to perform a full multiply: instead they merely perform simple add operations (addition of partial products) to derive the necessary offset from the delta-X values, using a proportionality constant provided by the rasterizer. The DDAs preferably include a "guard band" in their calculations, so that values which exceed the maximum (e.g. 255, for 8 bits of subpixel resolution) do not wrap to zero; instead the output is held at the maximum until the computed value comes down below the maximum.

Title
Graphics subsystem with coarse subpixel correction
Application Number
8/410220
Publication Number
5594854
Application Date
March 24, 1995
Publication Date
January 14, 1997
Inventor
Andrew Bigos
Chertsey
GB
David R Baldwin
Weybridge
GB
Agent
Matthew Anderson
Betty Formby
Robert Groover
Assignee
3Dlabs
BM
IPC
G06T 15/00
View Original Source