In an electronic endoscope system for detecting an image of an object using a CCD, a brightness signal is generated based on the output of the CCD, and a histogram processing is applied to the brightness signal. An aperture size for regulating the amount of light emitted to an object to be viewed is...http://www.google.fr/patents/US6080104?utm_source=gb-gplus-shareBrevet US6080104 - Electronic endoscope system
