| 摘要 |
In reading out an original of a state where a plurality of sheet faces are superimposed, image data is obtained by respectively scanning a first sheet face, a second sheet face which is the back side of the first sheet face, and a third sheet face which is a third face when the first sheet face is the first face. According to the read out image data, an opposite side transmittance rate representing degree of image transmittance on a first face which is the face of interest to be read out by an image of a second face which is the back side of the first face, and a trace transmittance rate representing degree of image transmittance on the first face by an image of a third face located facing the second face are obtained. Using respective calculated values of the opposite side transmittance rate and the trace transmittance rate, an unrequired image component in read out image data with an arbitrary sheet face as the first face is quantitated and subtracted from the read out image data. As a result, a read out image is obtained that is in fidelity to the image of the face of interest for read out even at the occurrence of not only opposite side transmittance, but also trace transmittance.
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