Loop filter utilized in encoder and associated signal processing method
US11770524B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2021 |
| Grant date | Sep 26, 2023 |
| Priority date | — |
| Expiry date | Nov 11, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loop filter utilized in an encoder includes a constrained directional enhancement filter and a decision circuit. The constrained directional enhancement filter is arranged to process multiple frames, wherein for a first frame in the multiple frames, the constrained directional enhancement filter determines a best filter strength of each block in the first frame in a first filter strength list, and determines a second filter strength list according to content of the first frame. The decision circuit is coupled to the constrained directional enhancement filter, and is arranged to record which index in the first filter strength list is the best filter strength corresponding to each block in the first frame, and provide the first filter strength list and the index corresponding to each block to an encoding circuit of the encoder as an output of the encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.