| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for fingerprint collation with higher reliability. SOLUTION: A fingerprint image is processed into thin lines by a conventional method and then feature points are extracted. The figure points are given IDs respectively and information that the feature points have is managed. As information on a feature point of interest to be collated, information showing what relation a ridge where a circumferential feature point is present has from the ridge position of the feature point of interest is stored in addition to the position, kind, and direction of the feature point of interest. Then, the information of the feature point of interest itself is collated and feature points on ridges in the same relation with the ridge position of the feature point of interest are also collated. When the feature point of interest and circumferential feature points have the same position and direction and are different in kind, points are lowered to represent the degree of matching. Then the collating results of those circumferential feature points are obtained as points and it is judged whether or not the points are larger than a threshold to judge whether or not the feature point of interest matches.
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