| 摘要 |
In a video signal gradation corrector used in a television receiver, an output of a look-up table memory (11) is supplied to a constant-multiplication circuit (31), an output signal of the constant-multiplication circuit (31) and an output signal of a look-up table operating circuit (10) are added by an adder (32), and the result of addition is set into the look-up table memory (11). Further, a video scene change detecting circuit (33) is provided between an output terminal of the look-up table operating circuit (10) and a coefficient control terminal of the constant-multiplication circuit (31), and a coefficient of the constant-multiplication circuit (31) is changed in accordance with a change in video scene. Thereby, a correction is made which is not affected by noises, is stable and smooth, and follows the change in video scene. <IMAGE> |
