Gamma correction device

Details Gamma correction device Gamma correction device

1990-01-24

1992-02-18

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 5202

Patent

active

050898906

ABSTRACT:
A gamma correction device comprises a classifying circuit which divides an input video signal into a plurality of level ranges according to a plurality of signal levels; a computing circuit which computes the region of the video signal within each of the level ranges obtained by the classifying circuit; and a gamma correction control circuit which is arranged to have the gamma correction characteristic thereof controlled according to each region computed by the computing circuit, to gamma-correct the input video signal and to output the gamma-corrected video signal.

REFERENCES:
patent: 3277318 (1966-10-01), Bedford
patent: 4450482 (1984-05-01), Ackermann
patent: 4799106 (1989-01-01), Moore et al.
patent: 4931864 (1990-06-01), Kawamura et al.

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