Probability mapping for entropy coding
US11178409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2020 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Mar 9, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/122
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for coding a frame of a video stream includes selecting a first initial probability distribution for coding at least a first portion of the frame; updating, to obtain an updated first initial probability distribution and using backward adaptivity, the first initial probability distribution while coding the first portion of the frame; mapping the updated first initial probability distribution to a second initial probability distribution; and coding a second portion of the frame using the second initial probability distribution as an initial probability distribution. The first values of the first initial probability distribution are described using M bits, wherein M is a first positive integer. Second values of the updated first initial probability distribution are described using N bits, where N is a second positive integer that is greater than M. Third values of the second initial probability distribution are described using M bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.