Rate control adaptation for high-dynamic range images
US10136133B2 · kind B2 · utility
4Cited by
15References
13Claims
0Family size
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Key dates
| Filing date | Nov 5, 2015 |
| Grant date | Nov 20, 2018 |
| Priority date | — |
| Expiry date | Mar 30, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/65
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high dynamic range input video signal characterized by either a gamma-based or a perceptually-quantized (PQ) source electro-optical transfer function (EOTF) is to be compressed. Given a luminance range for an image-region in the input, for a gamma-coded input signal, a rate-control adaptation method in the encoder adjusts a region-based quantization parameter (QP) so that it increases in highlight regions and decreases in dark regions, otherwise, for a PQ-coded input, the region-based QP increases in the dark areas and decreases in the highlight areas.
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