Patent ID: 7345778

Claim:
An image reading apparatus having a particular document detection unit used to detect whether or not a document to be read by a reading unit is a particular one, comprising: a first control section configured to load the particular document detection unit with a normal read image dictionary or a mirror read image dictionary to detect the particular document in accordance with a set document read mode, the set document read mode being a first document read mode, or a second document read mode different from the first document read mode; a first determination section configured to determine, when the normal read image dictionary or the mirror read image dictionary is loaded into the particular document detection unit, whether or not the normal read image dictionary or the mirror read image dictionary loaded in the particular document detection unit is an appropriate dictionary, using prestored software, check information concerning the loaded dictionary read from the particular document detection unit, and information concerning the document read mode; a second determination section configured to determine whether or not the particular document detection unit is loaded with the appropriate dictionary, using prestored software, the check information concerning the loaded dictionary and the information concerning the document read mode transmitted from the reading unit; and a second control section configured to determine whether or not the normal read image dictionary or the mirror read image dictionary loaded in the particular document detection unit is the appropriate dictionary, on the basis of the determination result of the first determination section and the determination result of the second determination section.