An image pickup device comprises variable gain control circuits 11-13 and 23-25 for respective channels of digital color signals and luminance signals to control the gains by a gain control signal SG. Since the gains are variable in the digital signal channels, the deterioration of the image quality...http://www.google.co.uk/patents/US5659358?utm_source=gb-gplus-sharePatent US5659358 - Image pickup device with digital signal processing for reducing signal distortion
