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Touch tracking on a touch sensitive interface

  • US 9,134,848 B2
  • Filed: 06/03/2009
  • Issued: 09/15/2015
  • Est. Priority Date: 06/03/2009
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving input values that are registered by touch locations of a touch sensitive input device;

    generating a plurality of frames from the received input values, each frame including one or more touch points;

    correlating each touch point on a first frame of the plurality of frames with a distinct touch point on a subsequent frame of the plurality of frames, wherein correlating comprises isolating the at least one distinct touch point by a search distance associated with each touch point on the first frame and a trajectory associated with each touch point on the first frame, performing a trajectory cost function for each of the distinct touch points in the subsequent frame and associating one of the distinct touch points in the subsequent frame having a minimal cost function with a first touch point in the first frame to extend the trajectory, wherein the search distance has a magnitude for each of the distinct touch points on the subsequent frame that is based on a differential positional change of each touch point between the first frame and a prior frame of the plurality of frames; and

    generating an instruction for a computer coupled to the touch sensitive input device to perform a function based on the correlated touch points.

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