Patent ID: 9529971
Filing Date: 2016-12-27
CPC Classification: G06K,G16H,G16Z

Claim Text:
1. A method for electronic authenticating a handwritten signature of a user entered on a writing surface via a writing instrument, wherein the method comprises: acquiring, by a capacitive touch area of said writing surface, periodically during an entering of said signature, altitude data consisting of an altitude z of said writing instrument relative to said writing surface, in an area of proximity to said writing surface, delivering a set of the altitude data representing a course of said writing instrument above said writing surface as a function of time as the writing instrument moves across the capacitive touch area, said set of the altitude data corresponding to a vertical variable distance separating a writing end of said writing instrument from said writing surface, said acquiring of the altitude data implementing a measurement of a capacitance by the capacitive touch area of said writing surface; and authenticating said entered handwritten signature by determining said entered handwritten signature correlates to a reference signature by only correlating the set of the altitude data with reference altitude data of the reference signature.