| 摘要 |
PROBLEM TO BE SOLVED: To provide an image reading apparatus and an image reading method capable of suppressing degrading of discrimination accuracy for abnormity discrimination even when the density of a reference board is changed. SOLUTION: The image reading apparatus SC wherein an image of an original S carried on one principal side of a contact glass 27 moved in a subscanning direction is read from the other principal side of the contact glass 27 by reflected light of an exposure lamp 26 includes: a reference board 10 arranged opposed to one principal side of the contact glass 27 and extended in a main scanning direction; an abnormity discrimination section that discriminates whether or not abnormity exists in an image resulting from reading the original S by comparing a density in the image with a preset threshold value; a read position setting section that revises an original read position along the subscanning direction within a range readable of the reference board 10 when the abnormity discrimination section discriminates the presence of abnormity; and a correction section that corrects the threshold value depending on the density of the reference board 10. COPYRIGHT: (C)2008,JPO&INPIT
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