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Video image reproducing apparatus provided with a contrast adjustment device, and method of adjusting the contrast in such a reproducing apparatus
Video image reproducing apparatus provided with a contrast adjustment device, and method of adjusting the contrast in such a reproducing apparatus
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机译:设有对比度调节装置的视频图像再现设备,以及在这种再现设备中调节对比度的方法
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摘要
The readjustment of the image contrast is effected by a processing circuit (12) of the video signal, provided with a contrast control terminal (21). Among the devices which automatically act on the contrast, the device for comparing the peak values of the video signal to a reference threshold (Vref) is also used for manual adjustment. The gain of the amplification of the video signal in the processing circuit is increased such that, for the majority of images, the peak values of the video signal reach the reference threshold (Vref), while a user control varies this reference threshold to effect the manual adjusting.
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