Image reading apparatus and image reading method

摘要

An image reading apparatus is provided with an supply device for supplying an original on a supply tray; a transport device for transporting the original to a platen; a discharge device for discharging the original; an optical reading device for scanning the original placed on the platen; a drive device for moving the optical reading device at the first moving speed or the second moving speed; and a detection device for determining a type of image data as either the first type of data or the second type of data. A scan control device obtains and stores image data while scanning a document at the first moving speed. A switching control device switches the drive device to the second moving speed when the detecting device determines the image data read at the first moving speed to be the second type of data.