| 摘要 |
PURPOSE:To automatically detect a defect such as dust or flaw by preceding the read of a picture by dividing an original picture into plural picture element regions, comparing a reference signal with a picture signal at every picture element region obtained through a prescribed filter prior to get the picture signal so as to detect defect information included in the picture element region. CONSTITUTION:The original picture is divided into plural picture element regions and the picture signal at every picture element region obtained through a prescribed filter prior to get the picture signal is compared with a reference signal to detect the defect information included in the said picture element region. For example, a sequence control circuit 10 selects at first the 1st filter 3-1 for defect detection and gives an instruction to restore the position of a stage 6 to the subscanning start position to a subscanning control circuit 14. When the stage 6 restores the home position as soon as the selection of the 1st filter is finished, the mode enters the defect detection mode of an original 4. In the defect detection mode, the defect such as dust or flaw existing on the original 4 is detected by a defect detection circuit 16 based on a signal Vos being the result of scanning of the original 4 by an infrared ray.
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