Video encoding
US6687297B2 · kind B2 · utility
29Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2001 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Feb 22, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To efficiently use space capacity and to provide accurate motion vectors for P-pictures, a two-pass search in a P-coding mode of an MPEG encoder is run so that the second pass refines the precision of motion vectors found in the first pass. Within a frame encoding period, the first pass coincides with the time interval used by a known MPEG video encoder in encoding B-pictures to search forward motion vectors with respect to a prior image, and, within the frame encoding period, the second pass coincides with searching backward motion vectors with respect to a subsequent image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.