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Method and apparatus for tracking a hand-held writing instrument with multiple sensors that are calibrated by placing the writing instrument in predetermined positions with respect to the writing surface

  • US 6,181,329 B1
  • Filed: 12/23/1997
  • Issued: 01/30/2001
  • Est. Priority Date: 12/23/1997
  • Status: Expired due to Term
First Claim
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1. A method comprising:

  • obtaining sensor readings for each of a plurality of predefined positions of a writing instrument generating a mapping of sensor outputs to writing instrument positions based, at least in part, on the sensor readings at the plurality of predefined positions with respect to a writing surface; and

    generating a mapping of possible sensor outputs to possible writing instrument positions comprises determining a polynomial approximation of future writing instrument positions corresponding to future sensor outputs based on sensor outputs at the predetermined positions, wherein the polynomial approximation includes the sensor outputs for each predefined position.

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