Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-12-24
1993-06-01
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 712
Patent
active
052165035
ABSTRACT:
A multichannel image compression system uses a plurality of encoders to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel. Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus is provided to recover an image from the compressed image data.
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W. Paik, "DigiCipher-All Digital, Channel Compatible, HDTV Broadcast System," IEEE Transactions on Broadcasting, vol. 36, No. 4, Dec. 1990.
Derovanessian Henry
Krause Edward A.
Liu Vincent
Paik Woo H.
Shen Paul
General Instrument Corporation
Kostak Victor R.
Lipsitz Barry R.
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