| 摘要 |
The invention includes a brightness reading position control section for reading reference data of a reference plate a plurality of times for different locations by an image reader, a reading data storage section for storing the plurality of brightness reading data on the basis of each charge coupled device element, and a correction value computing section for performing computations on the plurality of brightness reading data in order to compute correction reference data for performing shading correction of an image data derived from an original. The invention makes it possible to prevent variations in the correction reference data that occur due to dust sticking onto or scratches formed in the reference plate.
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