Method and apparatus for MPEG-4 FGS performance enhancement

Details Method and apparatus for MPEG-4 FGS performance enhancement Method and apparatus for MPEG-4 FGS performance enhancement

2007-06-05

2007-06-05

Rao, Andy (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240130

Reexamination Certificate

active

10786971

ABSTRACT:
An architecture of a fine granularity scalable (FGS) codec has an encoder and a decoder configurable in three prediction modes. The coarse prediction loop in the base layer of the encoder has a switch for selecting either coarse prediction output or fine prediction output in the encoder. The fine prediction loop in the enhancement layer of the encoder also has a switch for selecting either coarse prediction output or fine prediction output. Two-pass encoding is used in the encoder. The first pass extracts coding parameters and classifies macroblocks of a video frame into three groups each being assigned with all-coarse prediction mode, all-fine prediction mode or mix prediction. The second pass uses the assigned modes to encode the macroblocks. A rate adaptation algorithm is provided to truncate the enhancement bit-planes for low bit rate, medium bit rate and high bit rate and allocate bit efficiently for achieving higher video quality.

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