Signature verification method and apparatus
Patent 3983535 Issued on September 28, 1976. Estimated Expiration Date: 
September 28, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3579186 3618019 3699517 InventorsApplicationNo. 05/555216 filed on 03/04/1975US Classes:382/122, Sensing speed or acceleration only382/218, Comparator705/44Requiring authorization or authenticationExaminersPrimary: Boudreau, Leo H.Attorney, Agent or FirmInternational ClassesG06K 9/00 (20060101)G07C 9/00 (20060101) AbstractMethod 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. | |
