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Method and apparatus for using pressure information for improved computer controlled handwriting recognition data entry and user authentication

  • US 8,488,885 B2
  • Filed: 03/02/2009
  • Issued: 07/16/2013
  • Est. Priority Date: 03/01/2000
  • Status: Expired due to Term
First Claim
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1. In a portable computer system having an display, a digitizer, and a computer memory, a method of performing authentication comprising:

  • accessing spatial stroke data and pressure data captured by a digitizer of the portable computer system and representing a user-drawn signature wherein respective pressure data is associated with respective spatial stroke data, wherein a display screen of the portable computer system comprises the digitizer;

    storing the spatial stroke data and pressure data into the computer memory;

    building a set of first vectors from the spatial stroke data and the pressure data;

    comparing the first vectors of spatial stroke data and pressure data of the user-drawn signature to stored second vectors based on the spatial stroke data and pressure data of a reference signature for a match;

    generating an authentication signal upon a match of the first vectors and the second vectors; and

    provided the authentication signal is generated, allowing a user access to the portable computer system, otherwise prohibiting the user from accessing a portion of the portable computer system.

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