Picture signal processing method and image signal processing apparatus
US7639870B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 2002 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Oct 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/603
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a picture signal processing method for outputting a color picture. In encoding input picture data YCbCr into picture data for printing in a YCC picture formulating unit (2), chromaticity Cb, Cr are processed non-linear conversion processing by a non-linear function f(c), with the luminance Y remaining unaffected, to generate picture data for printing Ycb′Cr′. In a cmyk converter 3, the picture data for printing Ycb′Cr′, generated by the YCC picture formulating unit (2), are processed non-linear conversion processing by an inverse function f′(c) of the non-linear function f(c) to perform color space conversion processing matched to the color space of an output device. This converts the picture data for printing Ycb′Cr′ into picture data for output printing cmyk to improve color reproducing quality by controlling the encoding density locally in a wide color gamut.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.