Television – Bandwidth reduction system
Patent
1992-06-18
1994-03-01
Chin, Tommy P.
Television
Bandwidth reduction system
348415, H04N 7133
Patent
active
052912817
ABSTRACT:
An apparatus and method for adaptively compressing blocks of video image data provide a local coding level for use in compressing successive blocks of video image data. Each block is preliminarily compressed using a global coding level. The preliminarily compressed data is processed to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated based on the randomness measure. The video image data is then compressed using the local coding level to provide compressed data for transmission. One or more intermediate compression stages can be provided, each generating an intermediate coding level, to better refine the randomness measure for use in generating the local coding level.
REFERENCES:
patent: 5006929 (1991-04-01), Barbero et al.
patent: 5057916 (1991-10-01), Krause et al.
Krause Edward A.
Liu Vincent
Paik Woo H.
Chin Tommy P.
General Instrument Corporation
Lee Richard
Lipsitz Barry R.
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