Method and apparatus for encoding video color enhancement data, and method and apparatus for decoding video color enhancement data
US8761249B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2006 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A highly accurate reproduction of visual intensity and contrast rather than the conventional 8-bit color depth is more and more used, motivating the development of an enhanced dynamic range called high bit-depth. A method for encoding a first, low bit-depth image of M bit RGB pixels and a second, high bit-depth video image of N bit RGB pixels, M<N, both having same spatial resolution, comprises generating a first transfer function based on color histograms of the first and the second video image, generating a second transfer function based on the first transfer function, applying the second transfer function to the first video image, wherein a transformed first video image is generated, calculating and encoding the residual, encoding the first video image and transmitting the encoded first video image, the second transfer function and the encoded difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.