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Detecting and Tracking Touch on an Illuminated Surface

  • US 20130241887A1
  • Filed: 03/14/2013
  • Published: 09/19/2013
  • Est. Priority Date: 03/14/2012
  • Status: Abandoned Application
First Claim
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1. A method for touch detection performed by a touch processor in an optical touch detection system, the method comprising:

  • receiving an image of an illuminated surface comprised in the optical touch detection system, wherein the image is captured by a camera comprised in the optical touch detection system;

    identifying highly saturated pixels in the image;

    identifying a set of candidate touch locations in the image;

    classifying the candidate touch locations in the set of candidate touch locations to generate a set of validated candidate touch locations;

    pruning the set of validated candidate touch locations based on the identified highly saturated pixels to generate a set of final touch locations, wherein a validated candidate touch location is not included in the set of final touch locations if the validated candidate touch location corresponds to a highly saturated pixel; and

    outputting the set of final touch locations.

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