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SYSTEM FOR ALLOWING HANDWRITTEN INTERACTION WITH A COMPUTER

  • US 20100213252A1
  • Filed: 05/04/2010
  • Published: 08/26/2010
  • Est. Priority Date: 05/25/1999
  • Status: Active Grant
First Claim
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1. A system for enabling user interaction, the system including:

  • a printer for printing print data on a form, the print data being at least partially indicative of a plurality of marks, each mark having a predetermined pattern common to all marks and coded data, the predetermined pattern including a rotationally invariant pattern; and

    a sensing device for sensing the marks when moved relative to the form, for using the rotationally invariant pattern to correct for perspective distortion of the marks, for decoding the coded data of the marks, and for generating indicating data at least partially indicative of movement of the sensing device relative to the form.

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