Reshaping curve optimization in HDR coding
US10397576B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2017 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Oct 10, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system for coding high dynamic range (HDR) images using lower-dynamic range (LDR) images, a reshaping function allows for a more efficient distribution of the codewords in the lower dynamic range images for improved compression. A trim pass of the LDR images by a colorist may satisfy a director's intent for a given “look,” but may also result in unpleasant clipping artifacts in the reconstructed HDR images. Given an original forward reshaping function which maps HDR luminance values to LDR pixel values, a processor identifies areas of potential clipping and generates modified forward and backward reshaping functions to reduce the visibility of potential artifacts from the trim pass process while preserving the director's intent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.