Entropy coding for digital codecs
US7501964B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2007 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Aug 6, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and systems are provided for efficiently implementing content adaptive variable length coding on a modern processor. Some embodiments comprise encoding a non-zero coefficient in an array of coefficients in an iteration of an encoding loop. The code value of the encoded non-zero coefficient is determined, at least in part, by the magnitude of another non-zero coefficient in the array of coefficients. A run of zero coefficients preceding a non-zero coefficient in the array of coefficients is also encoded in the iteration of the encoding loop. The encoded non-zero coefficient is appended to an encoded video bitstream when encoded. The encoded run of zero coefficients is stored in a storage device and appended to the encoded video bitstream after all non-zero coefficients in the array of coefficients have been encoded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.