Passive touch system and method of detecting user input

  • US 6,803,906 B1
  • Filed: 07/05/2000
  • Issued: 10/12/2004
  • Est. Priority Date: 07/05/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. A passive touch system comprising:

  • a touch surface;

    at least two cameras associated with said touch surface, said at least two cameras acquiring images of said touch surface from different locations and having overlapping fields of view;

    a digital signal processor associated with each camera, the digital signal processors associated with said at least two cameras selecting pixel subsets of images acquired by said at least two cameras and processing pixel data acquired by the selected pixel subsets to generate pointer characteristic data when a pointer exists in said acquired images; and

    a master digital signal processor in communication with said digital signal processors, said master digital signal processor receiving pointer characteristic data from said digital signal processors and triangulating the pointer characteristic data to determine the location of said pointer relative to said touch surface.

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