Color image data compressing apparatus and method
US5162898A · kind A · utility
14Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compressing apparatus for compressing color image data including R, G and B data. The apparatus includes a converter for converting the R, G and B data into luminance data and chrominance data, and an encoder. The encoder encodes the luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, such as, e.g., in dark or bright areas. The encoder also encodes the chrominance data to compressed chrominance data in a similar manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.