An electronic endoscope system comprises a video-scope, an imaging device, and a black balance processor. The imaging device, which is provided on the video-scope, is exposed at a normal shutter speed so as to generate an image signal corresponding to an optical image that is formed thereon. The black...http://www.google.com/patents/US7728867?utm_source=gb-gplus-sharePatent US7728867 - Electronic endoscope system
