Coding position data for the last non-zero transform coefficient in a coefficient group
US9215464B2 · kind B2 · utility
3Cited by
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20Claims
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Key dates
| Filing date | Sep 19, 2013 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Dec 28, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and devices for video coding are described. When encoding a non-zero coefficient group (CG) prior to the last such group in a group scan ordering within a transform block, data representative of the true (x,y)-position of the last non-zero transform coefficient in a scan ordering within that CG is modified, to improve coding efficiency, based upon at least one of (a) an intra-prediction mode used to encode the block and (b) at least one coefficient group neighboring that CG. Upon decoding a CG thus encoded, the modification is un-done to retrieve the true (x,y)-position.
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