Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-02-21
1993-08-24
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
382 18, H04N 5208
Patent
active
052393780
ABSTRACT:
In a gradation corrector used in a television receiver, a clipping circuit is connected to an output of a histogram memory and a clipping level of the clipping circuit is changed in accordance with an output of an S/N detecting circuit. Thereby, when the minimum value is detected, it is possible to prevent a large variation of the value to be detected which may be caused from noises or the like. Also, a circuit for detecting a change in video scene and a recursive filter circuit composed of an adder and a xK circuit (and a two-input/one-output selector circuit are provided on the output side of a clipping circuit and the coefficient value K of the xK circuit (or the selector circuit is controlled in accordance with an output of the video scene change detecting circuit. Thereby, it is possible to make a smooth gradation correction which is not affected by noises or the like (or to make a gradation correction with rapid response which follows a change in video scene.
REFERENCES:
patent: 4855825 (1989-08-01), Santamaki et al.
patent: 5025316 (1991-06-01), Darby
patent: 5032905 (1991-07-01), Koga
Kageyama Atsuhisa
Tsuji Toshiaki
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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