Encoder, decoder, encoding method, and decoding method
US11956434B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2022 |
| Grant date | Apr 9, 2024 |
| Priority date | — |
| Expiry date | Dec 6, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/1887
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoder includes circuitry and memory coupled to the circuitry. The circuitry, in operation, for each coefficient of a plurality of coefficients included in a block, determines a base level relating to Context-Based Adaptive Binary Arithmetic Coding (CABAC) for the coefficient, and encodes an absolute value of the coefficient. In determining the base level, when one or more flags are used in encoding the absolute value of the coefficient, the base level is determined to be a first value, and when one or more flags are not used in the encoding, the base level is determined to be a second value that is smaller than the first value. In encoding the absolute value of the coefficient, when one or more flags are not used, a rice parameter is determined based on the base level which is equal to the second value, and the coefficient is binarized using the rice parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.