Patent ID: 8279504

Claim:
An image reading apparatus capable of reading both sides of a double-sided document using a first reading unit and a second reading unit different from the first reading unit, the image reading apparatus comprising: a first acquisition unit configured to acquire pieces of reading frequency information representing the number of reading counts of the first reading unit and the second reading unit, respectively; a second acquisition unit configured to acquire read color information representing appearance frequency of each gamut of a color on a document that is read by one of the first reading unit and the second reading unit; and a decision unit configured to decide, based on the pieces of reading frequency information and the read color information, one of the first reading unit and the second reading unit as a reference reading unit serving as a reference when performing correction to make reading characteristics of the first reading unit and the second reading unit relatively coincide with each other, wherein the decision unit is configured to decide the reference reading unit for each color represented by the read color information.