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Active presence detection with depth sensing

  • US 10,002,297 B2
  • Filed: 06/18/2013
  • Issued: 06/19/2018
  • Est. Priority Date: 06/20/2012
  • Status: Active Grant
First Claim
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1. A computer-implemented method for monitoring an operator'"'"'s use of a secure system, the method comprising:

  • (a) defining a detection zone extending from an operator terminal of the secure system to a depth boundary spaced apart from the operator terminal and corresponding to a distance from the operator terminal beyond which an operator cannot interact with the secure system;

    (b) using a depth-sensing camera system co-located with the operator terminal to acquire a series of images of one or more objects within the detection zone;

    (c) using the depth-sensing camera to measure distances from the operator terminal to the one or more objects in the series of images;

    (d) determining whether any of the one or more objects within the detection zone is a face, and, if so, associating the face with an operator;

    (e) following association of a detected face with the operator, using the depthsensing camera to track the distance from the operator terminal to the detected face and, if the distance extends beyond the depth boundary, signaling a walk-away event; and

    wherein step (d) comprises identifying, among a plurality of faces present within the detection zone, the face closest to the secure system based on distances to the plurality of faces measured using the depth-sensing camera and computationally associating that face with the operator.

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