Patent ID: 8947749
Filing Date: 2015-02-03
Classification: H04N

Abstract:
1. An apparatus, comprising: a reading unit configured to read an image of a document by eight being emitted to the document by a light emitting unit; a control unit configured to cause the reading unit to perform first reading processing for obtaining first information by causing the light emitting unit to emit light with a first light amount and to perform second reading processing for obtaining second information by causing the light emitting unit to emit light with a second light amount that is smaller than the first light amount while no document is placed at a reading position of the reading unit; a detecting unit configured to detect a first and a second position as positions of a foreign matter existing at the reading position according to a difference between the first and second information; and a determining unit configured to determine, in a case where an interval between the first position and the second position detected by the detecting unit is greater than a predetermined value, that a black foreign matter exists at each of the first position and the second position, and in a case where the interval between the first position and the second position detected by the detecting unit is less than the predetermined value, that a white foreign matter exists between the first position and the second position.