Gradation correcting apparatus for correcting luminance signal i

Details Gradation correcting apparatus for correcting luminance signal i Gradation correcting apparatus for correcting luminance signal i

1991-02-06

1992-08-18

Couso, Jose

Image analysis

Histogram processing

For setting a threshold

382 18, G06K 938

Patent

active

051406497

ABSTRACT:
A gradation correcting apparatus for correcting the gradation of a picture signal using histogram memories in the television image receiving machine, video tape recorder and so on. When color picture signals have been inputted, the picture portion having the particular color component is detected so as to digitially effect the gradation correcting operation in accordance with the color component.

REFERENCES:
patent: 4656665 (1987-04-01), Pennebaker
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4903142 (1990-02-01), Hasebe et al.
patent: 4931864 (1990-06-01), Kawamura et al.
patent: 5003614 (1991-03-01), Tanaka et al.

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