Gamma correction circuit for an analog video signal

Details Gamma correction circuit for an analog video signal Gamma correction circuit for an analog video signal

1991-06-26

1993-10-05

Hjerpe, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358164, 358455, H04N 969

Patent

active

052510174

ABSTRACT:
A video path receives the signal to be processed and a reference path receives a reference voltage, with both paths subjecting their respective signals to logarithmic amplification having the same characteristics. These two paths are combined in a summing circuit giving gains respectively of gamma and of one minus gamma. The output from the summing circuit is applied to an exponential amplifier which is followed by a buffer to provide the corrected output signal. By an appropriate adjustment of resistances in the summing stage and also by means of switching, it is possible to perform gamma correction over the range about 0.2 to about 5, and it is possible to perform such correction on very wideband analog signals.

REFERENCES:
patent: 3697857 (1972-10-01), El-Banna
patent: 4568978 (1984-02-01), Cosh
patent: 4736244 (1988-04-01), Shiota et al.
patent: 4794622 (1988-12-01), Isaacman et al.
patent: 4829381 (1989-05-01), Song et al.
French Search Report for French Application 90 08618 filed Jul. 6, 1990.

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