The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1997
Filed:
Mar. 24, 1995
David R Baldwin, Weybridge, GB;
Andrew Bigos, Chertsey, GB;
3Dlabs Inc. Ltd., Hamilton, BM;
Abstract
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.