High efficiency coding apparatus

Details High efficiency coding apparatus High efficiency coding apparatus

1988-05-18

1989-07-04

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358135, 358136, H04N 713

Patent

active

048455601

ABSTRACT:
A high efficiency coding apparatus controls the amount of generated information so that it does not surpass the transmission capacity of a transmission path when variable-length coding is employed for varying a word length corresponding to a dynamic range. With respect to a still block, distribution in which a movement amount is introduced is formed taking into account that frame-dropping processing is made to obtain the number of dynamic range occurrence. Not only threshold values in the level direction for defining a word length but also movement threshold values for the frame-dropping processing are changed to control the amount of generated information. As a result, the amount of generated information is controlled excellently without an increase in quantization errors.

REFERENCES:
patent: 4217609 (1980-08-01), Hatori
patent: 4562468 (1985-12-01), Koga
patent: 4745474 (1988-05-01), Schiff
patent: 4780760 (1988-10-01), Waldman

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