Patent ID: 7268807
Filing Date: 2007-09-11
Classification: G06K,H04N

Abstract:
1. A photosensor system comprising: a photosensor array comprising a plurality of photosensors arrayed two-dimensionally; an image reading section which reads a subject image at a predetermined image reading sensitivity, corresponding to a charge accumulating period, by using the photosensor array; sensitivity adjustment image reading means for reading a sensitivity adjustment subject image using a plurality of image reading sensitivities; optimal image reading sensitivity deriving means for deriving an image reading sensitivity optimal for reading the subject image, based on a pixel data group relating to an image pattern of the subject image read by the sensitivity adjustment image reading means; image reading sensitivity setting means for setting the optimal image reading sensitivity as the image reading sensitivity in the image reading section; wherein the optimal image reading sensitivity deriving means comprises image reading sensitivity correction means for correcting only one time a value of the image reading sensitivity optimal for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity, wherein the corrected image reading sensitivity is set as the optimal image reading sensitivity; image reading sensitivity setting means for setting the optimal image reading sensitivity as the image reading sensitivity in the image reading section; and reading control means for controlling execution of reading of the subject image, by using the image reading sensitivity set by the image reading sensitivity setting means.