Contact tracking and identification module for touch sensing

  • US 8,441,453 B2
  • Filed: 06/05/2009
  • Issued: 05/14/2013
  • 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 generating a control signal of a computing system having a touch sensitive surface, the method comprising:

  • obtaining motion information of a plurality of contacts, the contacts corresponding to touch devices on or near the surface at the same time, the motion information including a first value of a first component of motion that is one of translation motion, rotational motion, and scaling motion, and a second value of a second component of motion that is a different one of translation motion, rotational motion, and scaling motion than the first component of motion;

    determining an input activity;

    modifying the motion information to obtain modified motion information, the modifying including downscaling the second value with respect to the first value; and

    generating a control signal of the input activity based on the modified motion information.

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