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HANDWRITING AUTHENTICATION TECHNIQUE

  • US 3,699,517 A
  • Filed: 09/24/1970
  • Issued: 10/17/1972
  • Est. Priority Date: 09/24/1970
  • Status: Expired due to Term
First Claim
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1. Apparatus for authenticating a signature comprising transducer means having a writing surface with x and y Cartesian coordinate axes and a stylus engageable with said surface for impressing thereon a real time signature to be authenticated, means for energizing said transducer means, said transducer means having output terminals and being responsive to the engagement of the stylus with said surface for generating at said terminals real time signals corresponding to the number z(t) of contacts of said stylus with said surface and the variations x(t) and y(t) with time of the x and y coordinates of the stylus on said surface during the writing of the signature, means connected to said terminals for deriving signals corresponding to the velocity x(t), y(t) and acceleration x(t), y(t) components of said stylus during the writing of said signature, means responsive to said component signals and to said stylus contact signals for generating a vector representative of said real time signature, means for storing a corresponding reference signature vector derived from the variables z(t), x(t), y(t), x(t), and y(t) of a plurality Of prior signatures of the same person, and means for comparing said real time signature vector with said stored reference vector to authenticate said signature.

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