Figure location detecting system

Details Figure location detecting system Figure location detecting system

1998-03-17

2000-07-25

Tran, Phuoc

Image analysis

Pattern recognition

Feature extraction

382124, 382190, 382201, 382209, G06K 900, G06K 946, G06K 950, G06K 962, G06K 966

Patent

active

060945079

ABSTRACT:
A figure location detecting system is designed to detect a location of a first figure (e.g., search fingerprint) within a second figure (e.g., file fingerprint). Particularly, the system is designed to correctly match characteristic points of the first figure with characteristic points of the second figure even if the first figure contains a plenty of similar characteristic points whose characteristics are similar with each other and/or even if the first figure is (partially) distorted. Herein, the system creates matching characteristic point pair candidates each corresponding to a pair of a first characteristic point, corresponding to one of the characteristic points of the first figure, and a second characteristic point corresponding to one of the characteristic points of the second figure. The matching characteristic point pair candidates are created on the basis of relative characteristics which are calculated for proximity characteristic points which exist in proximity to the first and second characteristic points respectively. Then, the system narrows down the matching characteristic point pair candidates to matching characteristic point pairs by removing wrong matching characteristic point pair candidates, each of which is detected as a wrong match in consideration of a matching situation of the proximity characteristic points. Coordinate matching parameters are produced with respect to each of the matching characteristic point pairs. Thus, the system outputs most concentrated coordinate matching parameters which values of the coordinate matching parameters sequentially produced concentrate in most frequently.

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Ko Asai et al., "Automated Fingerprint Identification by Minutia-Network Feature--Matching Process", Inst. of Elect., Info and Comm. Eng. of Japan, vol. J72-D-II, No. 5, May 1989, pp. 733-740.
Akira Monden et al., "Correct Position Search for Palmprint Using Neighbor Minutiae", Technical Report of IEICE, PRMU97-40, 1997, pp. 23-30.

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