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Adaptive sensor-based activity classification

  • US 8,374,775 B2
  • Filed: 11/05/2009
  • Issued: 02/12/2013
  • Est. Priority Date: 11/05/2009
  • Status: Expired due to Fees
First Claim
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1. A method performed by one or more processors of a mobile device for determining an activity state of the mobile device, the method comprising:

  • calculating a movement onset threshold based on a statistical model of sensor measurements for a motion sensor of the mobile device, where the statistical model is a stationary mode of a separable log-normal distribution of a short-time variance of the sensor measurements;

    receiving a first set of measurements from the motion sensor;

    calculating a log-variance signal based on the first set of measurements;

    comparing the log-variance signal with the movement onset threshold; and

    determining that the log-variance signal exceeds the movement onset threshold.

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