Gradation corrector

Details Gradation corrector Gradation corrector

H - Electricity

04

N

H04N 5/21 (2006.01) G06T 5/40 (2006.01) H04N 5/14 (2006.01) H04N 5/20 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2061893

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.

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