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System and method for differentiating between pointers used to contact touch surface

  • US 7,532,206 B2
  • Filed: 03/11/2003
  • Issued: 05/12/2009
  • Est. Priority Date: 03/11/2003
  • Status: Expired due to Term
First Claim
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1. A touch system comprising:

  • a touch surface to be contacted by a pointer;

    at least one imaging device having a field of view looking generally across said touch surface; and

    at least one processor communicating with said at least one imaging device and analyzing images acquired by said at least one imaging device to;

    (i) determine the type of pointer used to contact said touch surface; and

    (ii) determine the location on said touch surface where pointer contact is made, wherein during image analysis to determine pointer type, said at least one processor processes the acquired images to determine if at least one three-dimensional formation identifying the pointer type integral with and adjacent the end of the pointer exists and if so, further processes the acquired images to recognize said at least one three-dimensional formation thereby to detect said pointer type.

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