Patent ID: 8339685
Filing Date: 2012-12-25
Classification: H04N

Abstract:
1. An image reading apparatus comprising: a manuscript table on which a manuscript is placed; a reflection mirror that moves relative to the manuscript table, and that reflects light which is emitted to and then reflected by the manuscript placed on the manuscript table; an image data generating unit that includes a plurality of light receiving pixels receiving the light reflected by the reflection mirror, and that generates image data on the basis of the light received by the plurality of light receiving pixels; and a positional information acquiring unit that acquires the image data generated by the image data generating unit with movement of the reflection mirror, and that acquires, on the basis of a density value of each pixel in the image data, information on a position of a pixel affected by an adhesion substance adhering to the reflection mirror, wherein the positional information acquiring unit determines a pixel having a density value exceeding a threshold value set in advance, as the pixel affected by the adhesion substance, and wherein the positional information acquiring unit identifies the number of pixel rows in each of which pixels each having a density value exceeding the threshold value are successively located, and the positional information acquiring unit determines that the pixels included in each of the pixel rows are pixels affected by the adhesion substance, if the number of the pixel rows is less than a predetermined number, and does not determine that the pixels included in each of the pixel rows are pixels affected by the adhesion substance, if the number of the pixel rows is more than the predetermined number.