Threshold-based lossy reduction color compression
US8605104B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2009 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Oct 12, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/122
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention sets forth a technique for compressing color data. Color data for a tile including multiple samples is compressed based on an equality comparison and a threshold comparison based on a programmable threshold value. The equality comparison is performed on a first portion of the color data that includes at least exponent and sign fields of floating point format values or high order bits of integer format values. The threshold comparison is performed on a second portion of the color data that includes mantissa fields of floating point format values or low order bits of integer format values. The equality comparison and threshold comparison are used to select either computed averages of the pixel components or the original color data as the output color data for the tile. When the threshold is set to zero, only tiles that can be compressed without loss are compressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.