Color image processing method and system
US5729360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1995 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Jan 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image processing system for generating recorder image signals of four colors containing India ink from three color signals, the color image processing system includes a converter for converting three color signals into separated brightness and chromaticity signals; a range converter for converting the brightness signal into a range converted brightness signal which is within a record color reproduction range; an edge detector for obtaining an edge amount signal from the range converted brightness signal; a chroma detector for detecting chroma of an image signal from the chromaticity signal; an edge enhancer for enhancing an edge part of an image represented by the range converted brightness signal; a smoothing circuit for smoothing the range converted brightness signal; a brightness and chromaticity converter which includes a converter for executing brightness conversion by mixing an output of the edge enhancer and an output of the smoothing circuit according to the edge amount signal detected by the edge detector and a converter for executing chromaticity conversion for providing a chromaticity signal corresponding to compression/expansion of the chroma according to an out…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.