Method and apparatus for comparing a test handwritten signature with a reference signature by using information relative to curvilinear and angular velocities of the signature
US5101437A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/30
- WIPO fieldControl
- WIPO sectorInstruments
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 thres…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.