Apparatus for automatic gamma control of television color signal

Details Apparatus for automatic gamma control of television color signal Apparatus for automatic gamma control of television color signal

1975-03-31

1977-07-26

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 953

Patent

active

040386856

ABSTRACT:
A plurality of comparators are used to compare the red, blue and green color signals of a color television camera against a first and second predetermined signal level threshold corresponding to selected values of grey scale. The outputs of the comparators are combined to ascertain the difference in signal amplitude between the red, blue and green signals with respect to the first and second predetermined signal thresholds which represent grey. If the amplitude deviation of the red, blue and green color signals is within the threshold limits, a control signal adjusts the gamma characteristics of the blue and red color channels to match the amplitude of the red and blue color signals to the amplitude of the green color signal to correct to grey. If the red, blue and green color signal deviation is without the threshold limits, the color signal is assumed correct and no adjustment is made.
The system provides automatic and continuous correction of gamma characteristics of the video signals generated by the television camera during the telecasting of an actual program source.

REFERENCES:
patent: 2514022 (1950-07-01), Bedford
patent: 3627911 (1971-12-01), Kubota et al.
patent: 3772462 (1973-11-01), Schneider
patent: 3786177 (1974-01-01), Bazin
patent: 3808358 (1974-04-01), Schneider

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