Adaptive ratio images in HDR image representation
US9467704B2 · kind B2 · utility
11Cited by
24References
14Claims
0Family size
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Key dates
| Filing date | Mar 23, 2016 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Mar 23, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Image encoding and decoding are described. An input HDR image is coded using a coded tone-mapped image, a coded invertible function of a ratio image, and a look-up table representing the inverse of the invertible function, wherein the ratio image represents the pixel by pixel ratio of the luminance pixel values of the input image and the corresponding luminance values in the tone-mapped image. A method to generate the invertible function based on a cumulative histogram of the ratio image is presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.