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METHOD AND APPARATUS FOR VITAL SIGNS MEASUREMENT

  • US 20180153455A1
  • Filed: 06/02/2016
  • Published: 06/07/2018
  • Est. Priority Date: 06/05/2015
  • Status: Active Grant
First Claim
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1. A method of determining changes in blood oxygen saturation of a subject comprising the steps of:

  • obtaining a video image of an area of exposed skin of the subject, the video image comprising signals representing intensity in at least two different colour channels;

    defining in the image a plurality of regions of interest in said area of exposed skin of the subject;

    determining a signal to noise ratio of a heart rate or breathing rate frequency component of one of the colour channel signals or both for each region of interest;

    determining whether to reject or not reject regions of interest based on the determined signal to noise ratio of a heart rate or breathing rate frequency component or both;

    processing the colour channel signals from non-rejected regions of interest by;

    normalising the signal in each of the colour channels by dividing each of the signals by its baseline component;

    determining the ratio of the amplitudes of the normalised signals from two of the colour channel signals; and

    outputting changes over time in the ratio as representing changes in blood oxygen saturation of the subject.

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