Method for the dynamic verification of an autograph character st

Details Method for the dynamic verification of an autograph character st Method for the dynamic verification of an autograph character st

1996-03-29

1998-03-24

Fridie, Jr., Willmon

Printed matter

Method

Identifying

283 67, 283 45, B42D 1500

Patent

active

057304688

ABSTRACT:
In a method for dynamic verification of an autograph character string on the basis of a reference autograph character string, the principle of dynamic programming is used for signature verification. Digitized handwriting data as functions of time are first normalized by a standard method. The verification works according to the invention with structural units of the signature, so-called strokes, which result from the writing motions with a raised or, respectively, lowered stylus. The particular concept is to base the dynamic programming on a cost function that combines several handwriting data. The stable structural portions of the signature are more strongly weighted in the method than unstable ones. This leads to a higher verification performance than in standard methods. The method also enables the comparison of signals having different numbers of strokes, so that omissions or additional strokes can be correctly evaluated, by predetermining syntactic rules for their treatment.

REFERENCES:
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patent: 5237394 (1993-08-01), Eaton
patent: 5537486 (1996-07-01), Stratigos et al.
patent: 5587560 (1996-12-01), Crooks et al.
Automatic S ignature Verification and Writer Identification-The State of the Art-Plamondon et al--pp. 107-131-Pattern Recognition, vol. 22, No. 2, pp. 107-131 1989.
Online Signature Verification Based on Shape, Motion, and Writing Pressure-Sato et al--pp. 823-826, 1982 IEEE.
The Use of a One-Stage Dynamic Programming Algorith for Connected Word Recognition-Hermann Ney--1984 IEEE.
IEICE ransactions, vol. E74, No. 7 Jul. 1991--On-line Signature Verification Incorporating the Direction of Pen Movement--Yoshimura pp. 2083-2092.

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