Patent ID: 6765615
Filing Date: 2004-07-20
Classification: H04N

Abstract:
Apparatus for reducing exposing time of an image processing system, said image processing system comprising a shift register coupled to a photo-sensing means, said photo-sensing means being used to convert an optical image from a lens to a plurality groups of charge to form an electrical signal, said apparatus comprising:control means for generating a first reset signal and a second reset signal during a first resolution mode and a second resolution mode of said image processing system respectively, a first number of cells of said photo-sensing means being exposed to said optical image during said first resolution mode, a second number of cells of said photo-sensing means being exposed to said optical image during said second resolution mode, said first number of cells of said photo-sensing means being greater than said second number of cells of said photo-sensing means, period of said first reset signal being-proportional to said first number of cells of said photo-sensing means, period of said second reset signal being proportional to said second number of cells of said photo-sensing means, said plurality groups of charge being transmitted to said shift register, and then being output from said shift register; and reset means for leading charges in said shift register to ground responding to said first reset signal and said second reset signal, said reset means coupled to said shift register generating potential-energy well at end of each period of said first reset signal and said second reset signal, said potential-energy well eliminating residual charges left in said shift register, said photo-sensing means converting said optical image to said plurality groups of charge responding to a exposing timing signal, period of said exposing timing signal being no less than period of said first reset signal when said image processing system being in said first resolution mode, period of said exposing timing signal being no less than period of said second reset signal when said image processing system being in said second resolution mode.