Patent ID: 8570609

Claim:
An image processing device comprising: an acquiring unit that acquires position data expressing positions of a plurality of reference images provided on a reference medium; a scanning unit that scans images of regions of the reference medium where the reference images are provided; and a determination unit that: calculates a sum of positional misalignment amounts between an image position of an instance of the plurality of reference images scanned by the scanning unit, and a position of the same instance of the plurality of reference images indicated by the position data acquired by the acquiring unit; performs alignment of the corresponding reference images using a common correction coefficient predetermined so as to give the smallest sum of the positional misalignment amounts; and determines a dilation amount in advance for dilating an image data to be scanned by the scanning unit, such that the dilation amount increases as the sum of the positional misalignment amounts increases, wherein the determination unit determines dilation amounts for each scanning by employing image data scanned a plurality of times from a region of the reference medium where the reference image is provided, and determines a final dilation amount based on the plurality of determined dilation amounts.