Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-09-29
1990-08-07
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, H04N 712
Patent
active
049472496
ABSTRACT:
An apparatus for coding digital video data represented by respective picture element data determines at least one elementary picture element for each block and predicts values of respective picture element data, whereupon predictive errors are detected from the difference between such predictive values and the real values of the respective picture element data. If the detected predictive errors is greater than a threshold value, flag data are generated and the elementary picture element data and the subject picture element data are gated, and maximum and minimum gated values are detected for each block as the basis for respective dynamic range information. Modified digital video data are generated for each block as the difference between the gated output data and one of the maximum and minimum gated values for the respective block, whereupon, the modified digital video data are encoded with a variable digitized bit number determined by the flag data for the respective block so as to provide coded data of variaable bit length to be transmitted with the flag data.
REFERENCES:
patent: 4442454 (1984-04-01), Powell
patent: 4734768 (1988-03-01), Pexa
Groody James J.
Kostak Victor R.
Sinderbrand Alvin
Sony Corporation
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