Patent Document ID: 20110242553
Application ID: 13044016
Patent Status: 0

Claim One:
1. A movement amount detection device comprising: an illumination unit configured to illuminate one side of a medium; an image acquisition unit configured to capture a plurality of images of the one side of the medium conveyed in a state of being illuminated by the illumination unit to acquire the images; an estimated movement amount calculation section configured to determine a similar region whose characteristic is most similar to a characteristic of a region to be matched, which is set within one of the images, within the other of the images, and to calculate an estimated movement amount of the medium from a positional relation between the region to be matched and the similar region; an error information acquisition section configured to acquire error information indicating a correspondence between error in the estimated movement amount attributable to an angle of light directed at the medium by the illumination unit and the estimated movement amount; and a movement amount calculation section configured to correct the estimated movement amount and to calculate the movement amount of the medium between a point when the one of the images was captured and a point when the other of the images was captured.