Contrast corrector for video signal

Details Contrast corrector for video signal Contrast corrector for video signal

1991-07-10

1993-10-19

Peng, John K.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358 32, 358 34, 358169, H04N 977, H04N 964, H04N 969, H04N 557

Patent

active

052550800

ABSTRACT:
For a video apparatus such as a television receiver, a gray level correcting device is provided to correct luminance and color saturation of a video signal, thereby making the reproduced image clear and vivid. In this device, at least one of the difference between the black level of the luminance signal and a predetermined pedestal voltage and the difference between the white level and a certain white level control voltage is calculated, and the color saturation of a chrominance signal is controlled by the color saturation control voltage added with the calculated difference.

REFERENCES:
patent: 3804981 (1974-04-01), Avins
patent: 3928867 (1975-12-01), Lynch
patent: 4038685 (1977-07-01), Bazin
patent: 4811101 (1989-03-01), Yagi
patent: 4831434 (1989-05-01), Fuchsberger
patent: 5003394 (1991-03-01), Lagoni
patent: 5068718 (1991-11-01), Iwabe et al.

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