Method of CABAC coefficient magnitude and sign decoding suitable for use on VLIW data processors
US7885473B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2007 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Dec 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention decodes coefficient magnitudes in compressed video data using a selected context and speculatively decodes a coefficient sign. The next context selection depends upon a number of iterations. This invention confirms the speculatively decoded coefficient sign upon completion of the magnitude decode. This invention operates in a loop until reaching the number of significant coefficients within the block. The method exits the loop and decodes an escape code if an iteration count is greater than a predetermined number. An embodiment of this invention collects both a count up and a count down in an escape code decode in one loop. An embodiment of this invention estimates the number of significant coefficients in a block and selects the inventive or a prior art decode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.