SHADING CORRECTION APPARATUS, IMAGE SCANNING APPARATUS, AND METHOD OF SETTING ADOPTED AREAS OF SHADING CORRECTION APPARATUS

摘要

PPROBLEM TO BE SOLVED: To improve image reproduction performance through a shading correction process by attaining data for high-accuracy shading correction regardless of defacement of a shading correction plate. PSOLUTION: The shading correction process includes classifying a shading correction plate 28 into small areas of F block and S block and detecting a valid area from a plurality of classified small areas for each block. The detected valid area is set as an adopted area. Before reading a document D, adopted areas of the shading correction plate 28 are scanned and data for high-accuracy shading correction is attained. PCOPYRIGHT: (C)2010,JPO&INPIT