Patent ID: 8503040

Claim:
An image reading device, comprising: a light source configured to emit light; a reading unit configured to read light reflected from an object, convert the light read to image data, and output the image data; a correction unit configured to correct the image data outputted by the reading unit based on correction data; a correction data storing unit configured to store the correction data to be used by the correction unit; an illumination target switch unit configured to switch an illumination target between a read position through which a document passes and a reference position different from the read position; a reflector arranged within a main scanning range to be scanned and configured to reflect, toward the reading unit, the light emitted to the read position by the light source, wherein the read position is situated between the reflector and the reading unit; a processor; and memory having machine readable instructions stored thereon that, when executed by the processor, cause the image reading device to operate as: a judgment unit configured to make a judgment as to whether the image data outputted by the reading unit when the illumination target of the light source is at the read position satisfies a predetermined condition; a correction data determination unit configured to determine the correction data based on the image data outputted by the reading unit in response to the illumination target of the light source being switched to the reference position by the illumination target switch unit; and a correction data update unit configured to store the correction data determined by the correction data determination unit in the correction data storing unit, wherein the illumination target switch unit is configured to switch the illumination target to the reference position in response to the judgment unit judging that the image data satisfies the predetermined condition.