The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1976
Filed:
Mar. 04, 1975
Noel M Herbst, Mount Kisco, NY (US);
John H Morrissey, Chappaqua, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Method and apparatus are disclosed for verifying a sample signature based on comparison of the dynamics of a reference and a sample signature. More particularly, second derivative values of pen displacements (i.e. acceleration) are periodically sampled for both a reference and sample signature and a comparison of these second derivative values is made. According to the disclosed verification method, the two lists of second derivative values are segmented and similar segments are individually compared and also correlated utilizing shifting of the segments during successive comparisons to find regions of high correlation. A running account of cross correlation values between successive segments of the two signatures are kept. Finally, the maximums of the cross correlation values obtained for each segment comparison are combined and this maximum correlation value is utilized as a verification indicator.