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Speckle-based two-dimensional motion tracking

  • US 20070109267A1
  • Filed: 11/14/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/14/2005
  • Status: Abandoned Application
First Claim
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1. A motion tracking device, comprising:

  • a laser positioned to direct a beam at a surface moving relative to the device;

    an array of photosensitive pixels positioned to receive light from the beam after the light reflects from the surface; and

    a processor configured to perform steps that include (a) calculating a series of data values representing a range of pixel intensities along a first dimension at a time t, (b) calculating a series of data values representing a range of pixel intensities along a second dimension at the time t, (c) calculating a series of data values representing a range of pixel intensities along the first dimension at a time t+Δ

    t, (d) calculating a series of data values representing a range of pixel intensities along the second dimension at the time t+Δ

    t, (e) determining motion along the first dimension using data from the series calculated in steps (a) and (c), and (f) determining motion along the second dimension using data from the series calculated in steps (b) and (d).

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