Patent ID: 6879344
Filing Date: 2005-04-12
Classification: H04N

Abstract:
1. A photosensor system comprising: a photosensor array including a plurality of photosensors in a two-dimensional array; image reading means for reading a subject image at a predetermined reading sensitivity by the photosensor array; pre-reading means for causing the subject image to be read by different regions of the photosensor array using different image reading sensitivities in a plurality of stages, prior to an image reading operation by the image reading means; optimal reading sensitivity extraction means for extracting an optimal image reading sensitivity suitable for the image reading operation based on a comparison of predetermined measurement amounts which relate to image patterns of the subject image read by said pre-reading means and which correspond to the different regions of the photosensor array; and reading sensitivity setting means for setting the optimal image reading sensitivity to a reading sensitivity of said image reading means.