Four motion vector coding and decoding in bi-directionally predicted interlaced pictures
US7529302B2 · kind B2 · utility
105Cited by
249References
17Claims
0Family size
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Key dates
| Filing date | Sep 15, 2004 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Sep 8, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For interlaced B-fields or interlaced B-frames, an encoder/decoder uses 4MV coding. For example, 4MV is used in one-direction prediction modes (forward or backward modes), but not in other available prediction modes (e.g., direct, interpolated). Using 4MV allows more accurate motion compensation for interlaced B-fields and interlaced B-frames; limiting 4MV to forward and backward modes reduces coding overhead and avoids decoding complexity associated with combining 4MV with modes such as direct and interpolated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.