| 摘要 |
A feature detecting circuit (4) detects an average luminance, a white area value and a black area value of a video signal, and a control circuit (5) controls a contrast adjusting circuit (2) to more gently change a video signal contrast gain at the time of increase compared with that at the time of reduction, in accordance with changes of the detected average illuminance, the white area value and the black area value. As a result, even when the contrast gain of the video signal is increased or reduced to adjust the contrast of the video signal, excellent video qualities can be obtained in the both cases. |
