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System and method for providing multi-dimensional touch input vector

  • US 8,605,046 B2
  • Filed: 10/22/2010
  • Issued: 12/10/2013
  • Est. Priority Date: 10/22/2010
  • Status: Active Grant
First Claim
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1. A method for detecting an id, position, size and convex contour of at least one touch object placed on a touch region W within a perimeter of a touch panel, the touch panel including on its periphery at least one light transmitter and at least one light sensor, said method comprising steps of:

  • (a) acquiring light intensity data from a subset of light paths L between at least one light transmitter and at least one light sensor of the touch panel, at least one of the light paths being interrupted by placement of at least one touch object within the touch region W;

    (b) computing hot regions H={hi;

    i≦

    NH, where hi is the ith hot region and NH is the number of hot regions} from a subset of said light intensity data by calculating the shape and boundary of interrupted light paths;

    (c) computing expected object area S by overlaying said hot regions H and comparing it with a predetermined overlay region P;

    (d) deriving totally disconnected expected object area S′

    from S;

    (e) computing spatial properties, including position, size and convex contour, of said totally disconnected expected object area S′

    ;

    (f) associating touch objects with a subset of said totally disconnected expected object area S′

    ;

    (g) assigning to each said touch objects an ID and said spatial properties as a touch input vector representing the placement of each touch object on the touch panel.

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