Detecting system for center of fingerprint

Abstract

Abstract PURPOSE:To detect the center coordinates of a fingerprint having a bowed pattern or a fingerprint having its unclear center by outputting the minimum curve error value of each curvature curve pattern registered and the estimated center coordinates corresponding to said minimum error value. CONSTITUTION:A direction curvature memory part 12 stores two-dimensionally the directions and curvatures of the rising lines of fingerprints. An upward curvature extracting part 16 extracts the direction curvature of each picture element in the horizontal direction out of the part 12 in response to each Y coordinates to obtain a maximum upward curvature and registers this curvature in an upward curvature temporary memory part 13. A curve error calculating part 17 approximates the upward curvature train of an input picture to each curvature curve pattern registered in a curvature curve pattern dictionary 14 and calculates the minimum curve error value and the estimated center Y coordinate value corresponding to said minimum error value to register these values to a curvature error temporary memory part 15. A center Y coordinate detecting part 18 detects the minimum one of those curve error minimum values of each curvature curve pattern and outputs the estimated center Y coordinates in response to said minimum value.

Inventors

• 👤 Masanori Hara
• 👤 雅範 原

Bibliographic Details