Adjustable gamma controller

Details Adjustable gamma controller Adjustable gamma controller

1984-12-24

1987-03-17

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358169, 307491, 307494, 307497, 307501, 328142, 330253, 330254, 330260, H04N 5202

Patent

active

046512101

ABSTRACT:
A gamma corrector for a video signal includes a first amplifier, a nonlinear signal translating stage and a second amplifier coupled in cascade in the order named. A feedback network coupled between the output of the second amplifier and a gain-control input of the first amplifier derives a gain-control signal indicative of the white level of the video signal produced at the output of the second amplifier. A gamma control signal is applied to a gain control input of the second amplifier in one embodiment and to a black level clamp associated with the first amplifier stage in another embodiment.

REFERENCES:
patent: 3633044 (1972-01-01), Buckstad et al.
patent: 4249208 (1981-02-01), Haenen et al.
patent: 4410908 (1983-10-01), Belmares-Sarabia et al.
patent: 4464633 (1984-09-01), Harwood et al.

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