Method for compensating image color when adjusting the contrast of a digital color image
US6438264B1 · kind B1 · utility
222Cited by
20References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 31, 1998 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Dec 31, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/643
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of adjustment of the color saturation characteristics of a digital color image is performed in order to compensate for an applied luminance tone scale function. This method comprises of the steps of receiving a tone scale function, calculating a local slope of the tone scale function for each pixel of the digital color image, calculating a color saturation signal from the digital color image, and adjusting the color saturation signal of the digital color image for each of the pixels based on the calculated local slope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.