Patent ID: 9300829
Filing Date: 2016-03-29
CPC Classification: H04N

Claim Text:
1. An image reading apparatus that reads an image of an original, comprising: a plurality of line reading sensors, each formed by arraying a plurality of reading elements, which are arranged in a direction the plurality of reading elements are arrayed and used for reading the image of the original; a conveyance roller for conveying the original in a direction different from the direction in which the plurality of reading elements are arrayed; a drive unit configured to drive said conveyance roller; a detection unit configured to detect a shift, that occurs at each of both ends of a reading area of each of the plurality of line-type reading sensors, from an image position in a predetermined calibration sheet corresponding to a rotation angle of the conveyance roller, for each of a plurality of positions of the plurality of line-type reading sensors, from image data obtained by reading the calibration sheet by the plurality of line-type reading sensors while causing said drive unit to drive said conveyance roller and conveying the calibration sheet; and an adjustment unit configured to adjust, using the detected shift at an end of one of the plurality of line-type reading sensors as a reference, reading at an end of another line-type reading sensor so as to reduce a difference of the shift from the reference.