| 摘要 |
PURPOSE:To obtain a high read position accuracy with simple constitution by converting line picture information read out from the reverse side in accordance with the position of an image sensor and by transmitting the position information once. CONSTITUTION:A one-dimensional image sensor 4 carries out main scanning of a line picture entered on the surface of a recording medium in the main scanning direction X from the reverse side, outputs line picture data DA and supplies them to a position information extraction part 6, which compares the supplied line picture data DA with storage data stored in a memory circuit 64, writes line picture data and outputs the corresponding position information. An address counter 63 generates an address at every scanning line in the positive direction YF in the subscanning direction and supplies it to the memory circuit 64. A comparator 65 compares the line picture data DA with storage data corresponding to the line picture data and outputs the position information to a transmission path from the memory circuit 64.
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