Context re-mapping in CABAC encoder
US9351003B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2013 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Nov 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/423
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video encoder may include a context-adaptive binary arithmetic coding (CABAC) encode component that converts each syntax element of a representation of a block of pixels to binary code, serializes it, and codes it mathematically, after which the resulting bit stream is output. A lookup table in memory and a context cache may store probability values for supported contexts, which may be retrieved from the table or cache for use in coding syntax elements. Depending on the results of a syntax element coding, the probability value for its context may be modified (e.g., increased or decreased) in the cache and, subsequently, in the table. After coding multiple syntax elements, and based on observed access patterns for probability values, a mapping or indexing for the cache or the table may be modified to improve cache performance (e.g., to reduce cache misses or access data for related contexts using fewer accesses).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.