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Techniques for creating a virtual touchscreen

  • US 8,446,389 B2
  • Filed: 10/15/2008
  • Issued: 05/21/2013
  • Est. Priority Date: 10/15/2008
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • utilizing two infrared lasers to generate a plane of infrared light above a surface to transform said surface into a virtual touchscreen;

    capturing, with a first infrared camera, a first group of infrared light reflected from an object breaking said plane of infrared light at a plurality of known positions on said surface, respectively, wherein said known positions correspond to a plurality of keys of a keyboard;

    capturing, with a second infrared camera, a second group of infrared light reflected from said object breaking said plane of infrared light at said plurality of known positions on said surface, respectively; and

    correlating said first and second groups of infrared light reflections and said plurality of known positions to provide a two-dimensional position for said object, wherein said two-dimensional position is calibrated with respect to said surface,wherein said correlating further includes;

    performing a first polynomial regression to determine a first set of coefficients for a first Taylor series expansion of a first coordinate of said two dimensional position; and

    performing a second polynomial regression to determine a second set of coefficients for a second Taylor series expansion of a second coordinate of said two dimensional position.

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