| 摘要 |
PROBLEM TO BE SOLVED: To provide an image reading device and an image reading method capable of properly reading the image pattern of a subject while inhibiting the generation of problems in the image reading operation caused by the environment light in an optical image reading device. SOLUTION: This image reading device is composed of a photosensitive system comprising a photosensor array 100 formed by two-dimensionally arranging double gate-type photosensors 10, an A/D converter 140, a controller 150 having a function for monitoring the tendency of the change of the output voltage outputted from each double gate-type photosensor 10, and executing the predetermined correction to the output voltage to correct the contrast of the read image having inclined contrast and uneven brightness caused by the incidence of environment light, a RAM 160 for storing the read image data and the like, and a back light 170 for applying the visible ray of light to the subject SUB placed on a detection face Fd.
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