Method of color correction
US7577291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2005 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Oct 29, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/643
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color defined by a chroma point and by a luma value is adjusted by defining a reference chroma point and shifting the chroma point towards the reference point if the chroma point is within a predefined tilted rectangle in the chroma coordinate plane that encloses the reference point; or if the chroma point is within both of two predefined polygons, in the chroma coordinate plane, that enclose the reference point; or if the luma value is within a predefined luma range. Preferably, the two polygons are a rectangle and a rhombus. The chroma point is shifted using a continuous shift function that vanishes on the rectangle and on the rhombus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.