Chroma reshaping of HDR video signals
US10542296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2017 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | May 9, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods for the chroma reshaping of high-dynamic range (HDR) signals are presented. For each input pixel, a first scaler is generated based on the pixel luminance and a luma-based chroma reshaping (LCR) function. A second scaler is generated based on a saturation-based chroma reshaping (SCR) function and the saturation value of the pixel. A cascaded scaler is generated by multiplying the first scaler with the second scaler. Reshaped chroma values are generated by multiplying the input chroma values with the cascaded scaler. The characteristics of preferred LCR and SCR functions are discussed. Inverse decoding methods based on chroma-reshaping metadata that define the LCR and SCR functions are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.