IMAGE READING APPARATUS WITH READING POSITION DETERMINATION UNIT THAT DETERMINES READING POSITION FOR ORIGINAL

An image reading apparatus which is capable of, even when there are foreign objects on a reading glass, determining a position unlikely to be adversely affected by the foreign objects as a reading position and reading an image. An original is conveyed to a reading area on the reading glass, and a reading unit reads the original at a reading position within the reading area. Foreign objects adhered to a plurality of candidate reading positions are detected using image data read at the plurality of candidate reading positions within the reading area by the reading unit in a state where the original is not being conveyed. A density of the foreign objects is measured, and a reading position at which the original is read is selected from among the candidate reading positions according to the density of the foreign objects.