×

Signature verification

  • US 4,701,960 A
  • Filed: 02/20/1986
  • Issued: 10/20/1987
  • Est. Priority Date: 10/28/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. The method of signature vertification comprising:

  • (a) inputting a first reference location of a writing instrument while writing a sample signature,(b) inputting a second reference location of the writing instrument while writing a sample signature,(c) generating a number string representative of a relationship between the first reference location and the second reference location;

    (d) repeating steps b-c using the second reference location as the first reference location thereby generating a series of number strings representative of the sample signature,(e) determining the derivative of each of the series of number strings,(f) selecting those number strings as buoys whose respective derivatives are greater than a buoy threshold value,(g) lowering the buoy threshold value if the number of buoys in the sample signature is less than a predetermined minimum value and selecting those number strings as buoys whose respective derivatives are the greater than the lower buoy threshold value,(h) raising the buoy threshold value if the number of buoys in the sample signature is greater than a predetermined maximum value and selecting those number strings as buoys whose respective derivatives are greater than the raised buoy threshold,(i) aligning the buoy of the sample signature with buoys of a reference signature,(j) comparing the sample signature series of number strings to a series of number strings representative of the reference signature; and

    ,(k) providing an output indicating if the same individual wrote the sample signature and reference signature.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×