| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensitivity adjustment device for a two-dimensional photo sensor system and its sensitivity adjustment method by which the optimum sensitivity can properly be set to the two-dimensional photo sensor system in order to allow a photo sensor to excellently read an object image under various environments in the case of applying the photo sensor to the two-dimensional photo sensor system. SOLUTION: The sensitivity adjustment device executes an advance reading where a photo sensor array 100 reads an image of an object while changing its image read sensitivity by each line. A data comparator 124 extracts a maximum value and a minimum value of lightness data by each line on the basis of the read image data, an adder 125 calculates a range of the lightness data on the basis of the maximum values and the minimum values of the extracted lightness data, then the data comparator 124 extracts a line having the maximum data range and data controller 122 writes and sets the image read sensitivity having been set to the line to a sensitivity register 127.
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