Context-based adaptive variable length coding for adaptive block transforms
US6795584B2 · kind B2 · utility
225Cited by
2References
16Claims
0Family size
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Key dates
| Filing date | Oct 3, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Nov 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for coding an image using context-based adaptive VLC where transform coefficients are partitioned into blocks having a block dimension of 4n×4m (with n, m being positive integer equal to or greater than 1). Each block is scanned in a zigzag manner to produce an ordered vector of coefficients having a length of 16n×m. The ordered vector is sub-sampled in an interleaved manner to produce n×m sub-sampled sequences of transform coefficients prior to encoding the transform coefficients using an entropy encoder.
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