Contact tracking and identification module for touch sensing

  • US 8,866,752 B2
  • Filed: 04/10/2009
  • Issued: 10/21/2014
  • Est. Priority Date: 01/26/1998
  • Status: Expired due to Term
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First Claim
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1. A method for a computing system including a touch sensitive surface, the method comprising:

  • obtaining tracking information of each contact of a set of a plurality of contacts, wherein the contacts correspond to touch objects concurrently on or near the surface, the tracking information including a position of a first contact of the set at a first time, the first contact further having a relative position to a location of each of the plurality of contacts;

    determining a motion of the set, wherein the motion of the set is based on the tracking information associated with each contact of the plurality of contacts of the set;

    determining a motion of a sub-set of the contacts of the set, wherein the motion of the sub-set is based on the tracking information associated with each of one or more, but not all, of the contacts of the set, wherein the sub-set includes the first contact, and both the motion of the set and the motion of the sub-set are determined based on the position of the first contact at the first time and independent of at least one of the relative positions;

    providing the motion of the set as a control signal of a first input of the computing system; and

    providing the motion of the sub-set as a control signal of a second input of the computing system.

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