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Auto-aligning touch system and method

  • US 7,256,772 B2
  • Filed: 04/08/2003
  • Issued: 08/14/2007
  • Est. Priority Date: 04/08/2003
  • Status: Active Grant
First Claim
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1. In a touch system having a touch screen with a touch surface on which an image is displayed, a method of automatically mapping the touch screen co-ordinate system to the display co-ordinate system comprising the steps of:

  • including in said displayed image at least one reference mark, the location of the at least one reference mark in said display co-ordinate system being known;

    acquiring an image of said touch surface including said displayed image;

    recognizing the at least one reference mark in said acquired image by comparing the acquired image with reference marks stored in a reference mark library;

    determining the location of said recognized at least one reference mark in said acquired image relative to said touch screen co-ordinate system; and

    automatically mapping said touch screen co-ordinate system to said display co-ordinate system using said determined location and the location of the at least one reference mark in said display co-ordinate system.

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