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System and methods for vital sign estimation from passive thermal video

  • US 8,149,273 B2
  • Filed: 07/10/2008
  • Issued: 04/03/2012
  • Est. Priority Date: 11/30/2007
  • Status: Expired due to Fees
First Claim
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1. A system for estimating vital signs from passive thermal video comprising:

  • an infrared video receiving module for receiving an infrared video segment of a subject;

    a contour segmentation module for contour segmenting the video segment to select a region of pixels representing a portion of the subject;

    an alignment module for aligning the selected region of pixels across a plurality of frames of the video segment;

    a signal detection module for detecting a signal from the selected region using a thermal wave propagation-based signal detection method;

    a spatial filtering module for spatial filtering the signal to remove noise not related to the vital signs to be estimated;

    a non-linear temporal filtering module to process a temporal signal corresponding to each aligned pixel sequence;

    an clustering module for removing outliers of the signal using a pixel clustering algorithm;

    a frequency selection module for selecting a frequency peak of the signal using a dominant frequency voting technique that generates a plurality of bins based on a sampling rate, each of the plurality of bins representing a possible frequency peak of the signal, votes on each of the plurality of bins and selects the frequency peak having a highest number of votes; and

    an averaging module for averaging the selected frequency peak to compute an average estimation of at least one vital sign.

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