Identifying contacts on a touch surface

  • US 8,466,883 B2
  • Filed: 05/01/2009
  • Issued: 06/18/2013
  • 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 input of a computing system including a touch sensing surface, the method comprising:

  • obtaining touch sensing information of a scan of the touch sensing surface;

    determining, based on the touch sensing information of the scan, contact information of a set of one or more contacts, each contact corresponding to a touch object on or near the surface;

    determining, based on the contact information, a first orientation of a first contact of the set;

    obtaining touch sensing information of another scan of the touch sensing surface;

    determining, based on the touch sensing information of the other scan, a second orientation of the first contact;

    determining a rotation of the first contact based on the first orientation and the second orientation; and

    generating input of the computing system based on the first orientation, including generating the input based on the rotation.

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