Method and apparatus for color image quantization
US5049986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Oct 26, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/644
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high-speed method and an apparatus for color image quantization utilizing an adaptive sampling technique in which the processing time is substantially determined by the number of simultaneously displayed colors to be selected, but is not affected by the number of colors or the color distribution in the original image. Factors contributing to improve the speed of color image quantization are that all calculations necessary for selecting the representative colors can be performed in an integer operation, and there is no need of distance calculation for mapping to neighboring representative colors. All that is required as data are a histogram, a divided color-space management list, and a division priority management list, so that required storage capacity may be small. Accordingly the invention can be implemented on a personal computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.