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Determining a Position of an Object Using a Single Camera

  • US 20110199335A1
  • Filed: 02/12/2010
  • Published: 08/18/2011
  • Est. Priority Date: 02/12/2010
  • Status: Abandoned Application
First Claim
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1. A position detection system comprising:

  • a camera, the camera positioned to image light traveling in a detection space above a surface of a display device and light reflected from the surface, the camera defining an origin of a coordinate system, the surface comprising the top of the display or a material positioned over the display;

    a controller, the controller configured to identify a position of an object in the space using (i) light reflected from the object directly to the camera and (ii) a mirror image comprising light reflected from the object, to the surface, and to the camera,wherein the position is identified based at least in part by;

    projecting a first line from the camera origin to a recognized point of the object in the detection space, projecting a second line from the camera to the reflection of the recognized point, the reflection in a virtual space corresponding to a reflection of the detection space, and determining whether the object is touching the surface based on the first and second lines.

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