Video signal correction system

Details Video signal correction system Video signal correction system

1993-01-06

1994-09-27

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

348645, 348712, H04N 978

Patent

active

053511417

ABSTRACT:
A novel video signal correction system is disclosed, in which an average picture level detection circuit detects the average picture level (APL) of a luminance signal, and a coefficient calculation circuit calculates the amount of correction by the APL circuit. An adder adds an APL-corrected signal to a corrected luminance signal. A limiter circuit, on the other hand, limits the lower limit level of an input luminance signal. A divider circuit divides an output signal of the adder by an output signal of the limiter circuit, and the result is used to correct an input color signal. The color signal is thus capable of being corrected in accordance with the APL while at the same time preventing excessive correction of the color signal with a low brightness input.

REFERENCES:
patent: 4430665 (1984-02-01), Cochran
patent: 5060056 (1991-10-01), Miki et al.

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