Patent ID: 6081294
Filing Date: 2000-06-27
Classification: H04N

Abstract:
A video processing system, comprising:an image sensor comprising an image area operable to receive light to form image data representative of an image, the image sensor operable to clear the image data from the image sensor responsive to an image clear signal;an image memory coupled to the image sensor image area and operable to receive the image data from the image sensor image area and to store the image data responsive to an image transfer signal, an exposure time associated with the image defined as the time between the image clear signal and the image transfer signal;an electronic iris controller circuit coupled to the image sensor image area and the image memory and operable to create and transmit the image clear signal and the image transfer signal, the electronic iris controller circuit operable to alter the exposure time in response to the image data by increments having variable length having increasingly smaller duration as the exposure time is decreased and having increasingly greater duration as the exposure time is increased; andan accordion clock signal having a constant number of transitions for a given period of time and having variable periods for at least some of the transitions, the increments having variable length are derived from the accordion clock signal.