Television – Bandwidth reduction system – Data rate reduction
Patent
1992-06-02
1994-06-14
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348469, H04N 7133
Patent
active
053214404
ABSTRACT:
Image data is encoded into sync blocks of fixed length and maximum data volume by dividing a vertical interval of image data samples, such as a field or frame of samples, into a plurality of blocks and deriving the orthogonal transform of the image data samples in each block. A block of conversion coefficients that are produced by the orthogonal transform are quantized with the same quantizing step to produce weighted, quantized conversion coefficients having a weighting factor that is a function of the visual activity of that block. Then, the weighted, quantized conversion coefficients of a block are variable length coded and the variable length codes of a predetermined number of blocks are combined into a sync block of fixed length.
REFERENCES:
patent: 4302775 (1981-11-01), Widergren
patent: 5006931 (1991-04-01), Shirota
patent: 5073820 (1991-12-01), Nakagawa
patent: 5073821 (1991-12-01), Juri
patent: 5109451 (1992-04-01), Aono
patent: 5150208 (1992-09-01), Otaka
Nagai Michio
Yanagihara Naofumi
Britton Howard W.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
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