Utilizing correlations between PPG signals and iPPG signals to improve detection of physiological responses
First Claim
1. A system comprising:
- a head-mounted contact photoplethysmography device configured to measure a signal indicative of photoplethysmogram signal (PPG signal) at a first region that comprises exposed skin on a user'"'"'s head;
a camera configured to capture images of a second region that comprises exposed skin on the user'"'"'s head;
wherein the camera is located more than 10 mm away from the user'"'"'s head; and
a computer configured to detect a physiological response based on;
(i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals.
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Abstract
Disclosed herein are systems and methods for detecting a physiological response using different types of photoplethysmography sensors. Examples of physiological responses that may be detected include an allergic reaction, a stroke, a migraine, stress, certain emotional responses, manifestation of pain, and blood pressure. In one embodiment, a head-mounted contact photoplethysmography device measures a signal indicative of photoplethysmogram signal at a first region that includes exposed skin on a user'"'"'s head (PPG signal). A camera, located more than 10 mm away from the user'"'"'s head, captures images of a second region that includes exposed skin on the user'"'"'s head. A computer detects the physiological response based on: (i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals.
69 Citations
20 Claims
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1. A system comprising:
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a head-mounted contact photoplethysmography device configured to measure a signal indicative of photoplethysmogram signal (PPG signal) at a first region that comprises exposed skin on a user'"'"'s head; a camera configured to capture images of a second region that comprises exposed skin on the user'"'"'s head;
wherein the camera is located more than 10 mm away from the user'"'"'s head; anda computer configured to detect a physiological response based on;
(i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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measuring a signal indicative of a photoplethysmogram signal (PPG signal) at a first region comprising exposed skin on a user'"'"'s head utilizing a head-mounted contact photoplethysmography device; capturing images of a second region comprising exposed skin on the user'"'"'s head utilizing a camera;
wherein the camera is located more than 10 mm away from the user'"'"'s head; anddetecting a physiological response based on;
(i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals. - View Dependent Claims (18, 19)
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20. A head-mounted imaging photoplethysmography system, comprising:
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a head-mounted contact photoplethysmography device configured to measure a signal indicative of a photoplethysmogram signal (PPG signal) at a first region comprising exposed skin on a user'"'"'s head; a head-mounted camera configured to capture images of a second region comprising exposed skin on the user'"'"'s head;
wherein the camera is located more than 10 mm away from the user'"'"'s head; anda head-mounted computer configured to; identify times at which fiducial points appear in the PPG signal; calculate, based on the times, time-segments in which the fiducial points are expected to appear in imaging photoplethysmogram signals (iPPG signals) recognizable the images; and detect a physiological response based on values of the iPPG signals during the time-segments.
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Specification