Contact tracking and identification module for touch sensing

  • US 8,730,192 B2
  • Filed: 08/07/2012
  • Issued: 05/20/2014
  • Est. Priority Date: 01/26/1998
  • Status: Expired due to Term
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First Claim
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1. A method of processing input from a touch-sensitive surface, the method comprising:

  • receiving at least one proximity image representing a scan of a plurality of electrodes of the touch-sensitive surface;

    segmenting each proximity image into one or more pixel groups that indicate significant proximity, each pixel group representing proximity of a distinguishable hand part or other touch object on or near the touch-sensitive surface; and

    determining one of a major axis and a minor axis of an ellipse of at least one of the pixel groups.

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