Patent Document ID: 8970931
Application ID: 13792601
Patent Status: 1

Claim One:
1. An image reading device, comprising: an imaging device including a plurality of imaging elements arranged in line in a main scanning direction; a color measuring unit configured to detect a level of light reflected from an object at a color measurement area to output an electric signal reflecting color of the object; a calibration plate having a surface on which a plurality of color patches is formed; a driving mechanism to drive the calibration plate to move in a direction parallel to the main scanning direction; and a processor configured to: instruct the driving mechanism to move the calibration plate against the imaging device, and instruct the color measuring unit to read the plurality of color patches while the calibration plate is moved in the direction parallel to the main scanning direction against the imaging device, to output color measurement results of the plurality of color patches; generate a set of reference values for the plurality of color patches based on the color measurement results of the plurality of colors; cause the imaging device to read the plurality of color patches while changing a relative position between the plurality of color patches and the plurality of imaging elements, to output reading results of the plurality f color patches; compare the reading results of the plurality of color patches, with the set of reference values for the plurality of color patches, to generate a comparison result; and generate a set of correction values based on the comparison result, the set of correction values being used for correcting the reading results of the plurality of color patches.