Dark level restoring circuit

Details Dark level restoring circuit Dark level restoring circuit

1984-08-20

1986-12-23

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 516

Patent

active

046315896

ABSTRACT:
A dark signal component below a predetermined level of a video signal is varied such that a dark peak level is made to coincide with a pedestal level by feedback control. According to this configuration, a signal component toward a white level side above the predetermined level is not changed by dark restoration, thus obtaining stable color reproduction and stable brightness which are not affected by the dark restoring operation.

REFERENCES:
patent: 3970777 (1976-07-01), Bradford
patent: 4124869 (1978-11-01), Heitmann
patent: 4369466 (1983-01-01), Matsuzaki

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