Method and apparatus for color gamut mapping
US6198843A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 4, 1997 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Sep 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Colorimetric values such as L*a*b* are input from an input section to a color gamut mapping portion. A filtering process is performed on an image of the difference between the image sent by the input section and an image obtained as a result of bi-directional conversion at a converter section, and the input to the converter section is controlled so as to satisfy a requirement of minimizing an evaluation function which is defined by the sum of square norm of the filtered image as a whole and a value obtained by performing a thresholding process on norm of the difference in each pixel between images before and after the conversion at the converter section output by a gamut extracting section, obtained for the image as a whole. Device values satisfying predetermined conditions which are output of a first neural network of a first converter section to an image output section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.