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Size/scale and orientation determination of a pointer in a camera-based touch system

  • US 7,619,617 B2
  • Filed: 09/28/2005
  • Issued: 11/17/2009
  • Est. Priority Date: 11/15/2002
  • Status: Active Grant
First Claim
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1. A touch system comprising:

  • at least two optical recording devices associated with a touch surface, said at least two optical recording devices acquiring images from different vantages and having overlapping fields of view, the at least two optical recording devices being accommodated by a frame at least partially bordering said touch surface; and

    processing structure processing image data acquired by said at least two optical recording devices to detect edges of a pointer in said images and to triangulate the detected edges to determine a bounding area that defines a pointer region.

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