Patent ID: 7916367

Claim:
An image reader comprising: a first read unit that reads a first face of a document to create image data; a second read unit, independent of the first read unit, that reads a second face of the document to create image data; a determination unit that determines which one of the first and second read units has read a recording face of a test chart when a test chart document, with the test chart recorded on one face, is read; a storage unit that stores the one of the first and second read units that has read the recording face of the test chart and that stores sampling data extracted from the image data created by the one of the first and second read units that has read the recording face of the test chart in association with each other; and a correction unit that corrects read characteristics of the read unit associated with the sampling data, based on the sampling data; wherein the determination unit is arranged to compare the image data created by the first read unit and the image data created by the second read unit to determine which one of the first and second read units has read the recording face of the test chart.