System and method for compressing color data using expandable color palette
US7091985B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2000 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Jan 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, and information bearing medium for compressing color utilizes an expandable color palette for storing a pre-established number of n-bit color codes. Each of the n-bit color codes maps to an m-bit color value, where m is an integer greater than n. Up to the pre-established number of n-bit color codes are stored in a first palette table of the color palette. The color palette is expanded to include up to a specified number of palette tables for storing sets of the pre-established number of n-bit color codes. The pre-established number of n-bit color codes is characterized by 2n−1 color codes. The color palette is expanded to include up to (m/n)−1 palette tables for storing sets of 2n−1 color codes. Each of the palette tables is associated with a pixel table which stores a linking value for associating a particular palette table to a subsequently generated palette table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.