Ellipse fitting for multi-touch surfaces

  • US 7,812,828 B2
  • Filed: 02/22/2007
  • Issued: 10/12/2010
  • Est. Priority Date: 01/26/1998
  • Status: Expired due to Term
First Claim
Patent Images

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

    mathematically fitting an ellipse to at least one of the pixel groups.

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