Method and device for encoding a high-dynamic range image
US10574987B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2014 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Dec 29, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure generally relates to a method and device for encoding an image block, characterized in that it comprises: obtaining (101) a low-spatial-frequency version (Llƒ) of a luminance component of the image block, said the obtained luminance component of the image block; obtaining a quantized luminance component (Llƒ,Q) of the image block by quantizing (102) the obtained luminance component (Llƒ) of the image block; obtaining (103) a differential luminance component (Lr) by calculating the difference between the luminance component (L) of the image block and either the quantized luminance component (Llƒ,Q) of the image block or a decoded version (Llƒ,Q) of the encoded quantized luminance component of the image block; encoding (104) the quantized luminance component (Llƒ,Q of the image block using at least one frequency coefficient of a set of frequency coefficients which is usually obtained from a block-based spatial-to-frequency transform for encoding the luminance component of the image block; and encoding (105) the differential luminance component (Lr) using the remaining frequency coefficients of said set of frequency coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.