Encoding and decoding reversible production-quality single-layer video signals
US10701375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2017 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Mar 22, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3256
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tone-mapping function that maps input images of a high dynamic range into reference tone-mapped images of a relatively narrow dynamic range is generated. A luma forward reshaping function is derived, based on first bit depths and second bit depths, for forward reshaping luma codewords of the input images into forward reshaped luma codewords of forward reshaped images approximating the reference tone-mapped images. A chroma forward reshaping mapping is derived for predicting chroma codewords of the forward reshaped images. Backward reshaping metadata that is to be used by recipient devices to generate a luma backward reshaping function and a chroma backward reshaping mapping is transmitted with the forward reshaped images to the recipient devices. Techniques for the joint derivation of forward luma and chroma reshaping functions are also presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.