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Synchronization of cameras in camera-based touch system to enhance position determination of fast moving objects

  • US 7,184,030 B2
  • Filed: 12/02/2003
  • Issued: 02/27/2007
  • Est. Priority Date: 06/27/2002
  • Status: Active Grant
First Claim
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1. In a camera-based touch system including at least one pair of cameras having overlapping fields of view and a touch surface encompassed within said overlapping fields of view across which a pointer is moved, wherein the cameras of said at least one pair acquire images at intervals asynchronously, a method of synchronizing image data acquired by said at least one pair of cameras comprising the step of:

  • for each camera in said pair;

    processing each acquired image to determine the position of said pointer therein and recording the position together with a timestamp representing the time elapsed between a reference point common to said cameras and the time the image was acquired; and

    interpolating between pairs of recorded positions to generate interpolated positions and recording each interpolated position together with a synchronization time representing a time each image would have been acquired had said cameras been synchronized.

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