VIDEO IMAGE REPRODUCTION DEVICE WITH CONTRAST ADJUSTMENT, AND METHOD OF ADJUSTING THE CONTRAST OF SUCH A REPRODUCTION DEVICE

摘要

P The contrast adjustment of the image is achieved by means of a processing circuit 12 of the video signal, provided with a contrast control terminal 21. / P P Among the devices acting automatically on contrast, the device for comparing the peak values of the video signal with a reference threshold Vref2 is also used for manual adjustment. The amplification gain of the video signal is increased so that, for the majority of the images, the peak values of the video signal reach said reference threshold Vref2, whereas the control 45 of variation of this reference threshold constitutes the control device. manual adjustment, made available to the user. / P P Application to CRT image reproducing apparatus, particularly television sets. / P