Method and apparatus for comparing a test handwritten signature

Details Method and apparatus for comparing a test handwritten signature Method and apparatus for comparing a test handwritten signature

1991-02-11

1992-03-31

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 13, G06K 900

Patent

active

051014378

ABSTRACT:
Apparatus and method for comparing a test handwriting signature with a reference signature where each of the test and reference signatures have been acquired by generating three electrical digital position signals characterizing a trajectory of a handwriting signature. The apparatus comprises a device for calculating variations of simple dynamic parameters of the test signature with respect to the simple dynamic parameters of the reference signature, by calculating a first evaluating function C1; a device for comparing C1 with a first threshold value, and rejecting said test signature if C1 passes the first threshold value; a device for calculating local intrinsic correlations of V.sub..sigma. and V.sub..theta. values of the test and reference signatures for each pair of characteristic segments, by calculating a second evaluating function C2; a device for comparing C2 with a third threshold value, and rejecting the test signature if C2 passes the third threshold value; a device for calculating a classifying function C.sub.b ; and a device for comparing the classifying function C.sub.b with a fourth threshold value, and rejecting the test signature if C.sub.b passes the fourth threshold value.

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