Method and system for providing bi-directionally predicted...

Details Method and system for providing bi-directionally predicted... Method and system for providing bi-directionally predicted...

2005-05-13

2011-11-08

Patel, Jay Au (Department: 2485)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240120, C375S240130, C375S240140, C375S240160

Reexamination Certificate

active

08054882

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.

REFERENCES:
patent: 5608458 (1997-03-01), Chen et al.
patent: 7194035 (2007-03-01), Dumitras et al.

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