Pedestal control circuit

Details Pedestal control circuit Pedestal control circuit

1986-03-14

1987-10-20

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 34, 358164, H04N 969, H04N 972

Patent

active

047017864

ABSTRACT:
In a pedestal control circuit, a reference signal is superposed on a video signal before gamma correction. The reference signal component is detected from the gamma-corrected video signal. The level of the detected reference signal component is compared with the level of a pedestal control signal. The level of the reference signal to be superposed on the video signal is controlled in accordance with the comparison result so that the pedestal level of the gamma-corrected video signal is constant.

REFERENCES:
patent: 3651248 (1972-03-01), Schneider
patent: 3845326 (1974-10-01), Godden
patent: 4038685 (1977-07-01), Bazin
patent: 4202009 (1980-05-01), Ushiyama et al.
patent: 4249208 (1981-02-01), Haenen et al.
patent: 4473839 (1984-09-01), Noda
patent: 4506287 (1985-03-01), Yamanaka et al.

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