Color adjustment apparatus
US5289295A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Jul 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/62
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color adjustment apparatus includes a color space conversion circuit for obtaining a chromaticity signal in a rectangular coordinate system of a plane representing hue and saturation components. A pointed color chromaticity signal setting circuit sets a pointed color chromaticity signal, which is the prominent color chromaticity signal desired to be changed. A color adjustment area setting circuit sets a color adjustment area of which the center is the pointed color chromaticity signal. A target color chromaticity signal setting circuit sets a target color chromaticity signal. A color conversion circuit generates a converted chromaticity signal (u.sub.h *, v.sub.h *). The converted chromaticity signal is obtained by shifting an original chromaticity signal (u*, v*) by an amount equal to a change from said pointed color chromaticity signal to said target color chromaticity signal. A weighting coefficient setting circuit sets a weighting coefficient (.omega.). And a color adjustment operating circuit generates a corrected chromaticity signal (u.sub.0 *, v.sub.0 *) which is a sum of the converted chromaticity signal and the original chromaticity signal added at the rate of the weigh…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.