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Method for spatially-accurate location of a device using audio-visual information

  • US 8,447,329 B2
  • Filed: 02/08/2011
  • Issued: 05/21/2013
  • Est. Priority Date: 02/08/2011
  • Status: Expired due to Fees
First Claim
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1. A computer-generated method for determining position information, the method comprising:

  • receiving a first time-stamped notification from a first mobile computing device, the first time-stamped notification indicating that a first chirp signal in an audio frequency range has been broadcast by the first mobile computing device;

    receiving a second time-stamped notification from a second mobile computing device, the second time-stamped notification indicating that the first chirp signal has been received by the second mobile computing device;

    determining distance between the first and second mobile computing devices based on time difference between the first and second time-stamped notifications, where the first chirp signal in the audio frequency range is transmitted with a distinctive pattern to allow detection of the first chirp signal from other signals present in the audio frequency range;

    transmitting first direction information to the first mobile computing device to direct a first user of the first mobile computing device toward a position of a second user of the second mobile computing device;

    receiving frames of a video stream from the first mobile computing device, the frames including an image of the second user; and

    performing facial recognition to recognize the second user.

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