Systems and methods for video-based monitoring of vital signs
AssigneeCovidien LP
InventorsPaul Stanley Addison, David Foo, Dominique Jacquel
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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.
Claims22
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.
A camera-based method of measuring a patient's vital sign, comprising:
- 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.
A camera-based method of measuring a patient's vital sign, comprising:
- 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.
Dependencies are inferred from the claim text.