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Method to scale inertial location data using directional and/or scale confidence constraints

  • US 8,990,014 B2
  • Filed: 03/14/2014
  • Issued: 03/24/2015
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method for determining a scale used in estimating a path of a computing device in motion, the method comprising:

  • receiving a plurality of pairs of points along the path based on inertial sensor data from the computer device;

    determining which of the plurality of pairs of points along the path are constrained, each constrained pair of points comprising a first point and a second point, the first point being associated with a first constraint having a first radius, the second point being associated with a second constraint having a second radius, the first point and the second point being separated by a distance;

    determining for each constrained pair of points a first bound and a second bound based on the first radius, the second radius, and the distance;

    determining a first intersection of the first bounds of the plurality of pairs of points and a second intersection of the second bounds of the plurality of pairs of points; and

    setting the scale as an intersection of the first intersection and the second intersection.

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