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TOUCH SYSTEM AND POINTER COORDINATE DETECTION METHOD THEREFOR

  • US 20110050644A1
  • Filed: 06/11/2010
  • Published: 03/03/2011
  • Est. Priority Date: 08/28/2009
  • Status: Active Grant
First Claim
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1. A pointer height detection method for a touch system, comprising the steps of:

  • capturing an image window looking across a plate surface with at least one image sensor;

    calculating a variation of each column of pixels in the image window; and

    comparing the variation of at least one column of pixels with the smallest variation in the image window and at least one threshold to indentify a height of a pointer relative to the plate surface.

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