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Abstract

An image reading device includes: contact glass, a document reading section that reads a document loaded on the contact glass while a moving mechanism moves in a document reading direction, a reading control section that causes the document reading section to read the whole contact glass at a rate of once per a predefined number of times N1, a first contamination detection section, and a report section. The first contamination detection section detects, from image data of the whole contact glass obtained through the reading by the document reading section, contamination of the contact glass present in a region other than a region loaded with the document. The report section, upon detecting by the first contamination detection section the same contamination from all the pieces of image data obtained consecutively a predefined plural number of times M1, reports a user that the contamination is present on the contact glass.

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First Claim