PURPOSE: To improve precision by regarding points where a contour line changes abruptly as singular points, calculating the extents of horizontal shifts of the singular points of a seal impression to be collated from those of a reference seal impression, and discriminates whether the in-use seal impression is true or not on the basis of the total value of respective calculated data.
CONSTITUTION: A reader 50 which reads a code number printed on a check 1 and a camera device 3 which takes a picture of a seal impression on the check 1 are provided in the middle of a conveyance path for the check. The camera device 3 includes a read line sensor and a binary coding circuit and the binary- coded signal of the seal impression to be collated is sent out to a picture processor 4. The picture processor 4 regards the points where the contour line of the seal impression changes abruptly as singular points, calculates the extents of the horizontal shifts of the singular points of the seal impression to be collated from those of the reference seal impression, and discriminates on whether the in-use seal impression is true or not on the basis of the total value of respective calculated data.
NAKAYA KUNIO
TSUJI SHIYUUJI
SAKA KAZUHIKO
