System for re-quantization of coded picture signals

Details System for re-quantization of coded picture signals System for re-quantization of coded picture signals

1985-02-19

1987-06-30

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, 358260, 382 50, H04N 712, H04N 140

Patent

active

046774793

ABSTRACT:
A coded picture signal re-quantization system, in which a parameter such as a variance or a mean value of picture element values in a region to be re-quantized is calculated on the basis of sub-sampled picture element values and, according to this parameter, a quantizer is adaptively varied for each region and, further, quantization of thinned-out picture elements is performed or stopped as required, thereby effecting conditional re-quantization.

REFERENCES:
patent: 4204227 (1980-05-01), Gurley
patent: 4225885 (1980-09-01), Lux et al.
patent: 4238768 (1980-12-01), Mitsuya et al.
patent: 4393452 (1983-07-01), Sekigawa
patent: 4494144 (1985-01-01), Brown

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