| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the cost of a paper-sheet stain detection apparatus. <P>SOLUTION: In the paper-sheet stain detection apparatus 10, a type and a transportation direction of a paper sheet are identified, and information on whether each extraction target area corresponds to a white portion or a patterned portion is stored. When the stored extraction target area corresponds to the white portion, a pixel having a lowest pixel value is extracted from the extraction target area, and a read image 3 is compressed into the pixel values of the extracted pixels as representative values to generate a compressed image 1 including the characteristic of a fine graffiti line drawn with a pencil or the like. As a result of generating the compressed image 1, it is possible to greatly reduce the capacity to be stored in an image memory, and to reduce also computational complexity in deciding a stain on a paper sheet. <P>COPYRIGHT: (C)2010,JPO&INPIT |
