Method and system for providing bi-directionally predicted video coding
US8054882B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2005 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Aug 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/51
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A segment of a B picture is encoded using motion estimation based prediction according to a determination as to whether motion vectors corresponding to a number of already constructed reference pictures of the B picture are acceptable for use in a direct prediction mode without further refinement or whether refined motion vectors are needed. In response to a determination that refined motion vectors are needed, refined motion vectors are computed through a motion estimation process and are used to encode a temporal direct mode. The coded segment of the B picture does not include refined motion vectors in an encoded bit stream. Decoding the encoded bit stream involves identifying the mode selected for coding the segment of the B picture. Where the temporal direct mode using refined motion vectors was selected for encoding, local motion estimation refinement is used to generate local motion vectors, which are used to reconstruct the segment of the B picture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.