High efficiency coding apparatus

Details High efficiency coding apparatus High efficiency coding apparatus

1986-11-19

1988-01-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 27, H04N 713

Patent

active

047220031

ABSTRACT:
In an apparatus for coding digital video data in a block format, the dynamic range information is generated from maximum and minimum values of plural picture elements in a block, and the minimum value is subtracted from each of the digital data to generate modified digital video data. A distribution table of the dynamic range information during a predetermined period, such as plural fields, is generated, and the encoding bit number for each block is determined based on the distribution table and the capacity of the transmission line such as a VTR. The modified data is encoded with such encoding bit number and transmitted with a first additional code per block formed of the minimum value and a signal based on the dynamic range information and with a second additional code for the predetermined period.

REFERENCES:
patent: 4656500 (1987-04-01), Mori
patent: 4677479 (1987-06-01), Hatori

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