Systems and methods for video-based monitoring of vital signs
First Claim
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1. A video-based method of measuring a patient'"'"'s vital sign, comprising:
- receiving a video signal from a video camera, the video signal having a field of view that includes exposed skin of a patient;
extracting from the video signal a time-varying color signal for each of a plurality of regions, each region including exposed skin of the patient;
identifying a frequency content of each color signal;
selecting two or more non-adjacent, non-overlapping regions that have a shared frequency content comprising a modulation at a shared frequency;
combining the color signals of the selected regions;
measuring a vital sign from the combined color signal; and
outputting the vital sign for further processing or display.
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Abstract
The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals.
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Citations
22 Claims
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1. A video-based method of measuring a patient'"'"'s vital sign, comprising:
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receiving a video signal from a video camera, the video signal having a field of view that includes exposed skin of a patient; extracting from the video signal a time-varying color signal for each of a plurality of regions, each region including exposed skin of the patient; identifying a frequency content of each color signal; selecting two or more non-adjacent, non-overlapping regions that have a shared frequency content comprising a modulation at a shared frequency; combining the color signals of the selected regions; measuring a vital sign from the combined color signal; and outputting the vital sign for further processing or display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A camera-based method of measuring a patient'"'"'s vital sign, comprising:
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receiving an image signal from a camera having a field of view encompassing exposed skin of a patient, the image signal comprising a sequence of image frames over time; within the field of view, identifying a plurality of regions; for each region of the plurality, extracting an intensity signal comprising a time-varying light intensity detected in the region; selecting regions whose intensity signals comprise a modulation at a shared frequency, wherein the selected regions are non-adjacent and non-overlapping in the image frame; combining the intensity signals of the selected regions to produce a combined intensity signal; and measuring heart rate of the patient from the combined intensity signal. - View Dependent Claims (14, 15, 16, 17)
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18. A camera-based method of measuring a patient'"'"'s vital sign, comprising:
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receiving an image signal from a camera having a field of view encompassing exposed skin of a patient; receiving a user input identifying a region in the image signal; measuring a first vital sign of the patient, comprising; from the region, selecting a first set of pixels that exhibit a first modulation at a first shared frequency, wherein the first selected pixels are non-contiguous and non-overlapping; and measuring the first vital sign of the patient from the selected first pixels; and outputting the first measured vital sign for further processing or display. - View Dependent Claims (19, 20, 21, 22)
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Specification