Television – Bandwidth reduction system – Data rate reduction
Patent
1997-06-25
1998-11-10
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348405, H04N 730
Patent
active
058351493
ABSTRACT:
A computer-implemented method and apparatus for encoding video pictures of a sequence of video pictures, wherein each picture is defined by one picture type of a plurality of picture types and each picture has a complexity. According to a preferred embodiment, the complexity of each picture type is estimated to provide a complexity estimate for each picture type. Encoding a picture at an average quantization level produces an encoded bit stream having a codesize related to the complexity of the picture, and each picture type is associated with a target codesize. An average quantization level is determined for the first picture of each picture type in accordance with the target codesize and complexity estimate of each of the first pictures, respectively. The first picture of each picture type is then encoded at its respective average quantization level. An actual average quantization level at which each first picture was actually encoded is determined, and the complexity estimate for each picture type is updated in accordance with the actual average quantization level and codesize of the first picture of the picture type encoded.
REFERENCES:
patent: 5144426 (1992-09-01), Tanaka et al.
patent: 5245427 (1993-09-01), Kunihiro
patent: 5473377 (1995-12-01), Kim
Au Amelia
Intel Corporation
Kinsella, Esq. N. Stephan
Murray, Esq. William H.
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