IMAGING-BASED MONITORING OF STRESS AND FATIGUE
First Claim
1. A system for monitoring stress and fatigue of a subject, the system comprising:
- collection optics that collect a portion of light reflected from a face of the subject and produce video-rate images of the face of the subject; and
an image processor configured to;
locate an eye in the video-rate images;
extract fatigue signatures from the located eye;
determine a fatigue level of the subject, in part, from the fatigue signatures;
locate a facial region away from the eye in the video-rate images;
extract stress signatures from the located facial region; and
determine a stress level of the subject from the stress signatures.
1 Assignment
0 Petitions
Accused Products
Abstract
An example system can monitor the stress and fatigue of a subject. The system can include a light source configured to direct illuminating light onto a face of the subject. The illuminating light can reflect off the face of the subject to form reflected light. The system can include collection optics that collect a portion of the reflected light and produce video-rate images of the face of the subject. The system can include an image processor configured to locate an eye in the video-rate images, extract fatigue signatures from the located eye, and determine a fatigue level of the subject, in part, from the fatigue signatures. The image processor can also be configured to locate a facial region away from the eye in the video-rate images, extract stress signatures from the located facial region, and determine a stress level of the subject from the stress signatures.
22 Citations
20 Claims
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1. A system for monitoring stress and fatigue of a subject, the system comprising:
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collection optics that collect a portion of light reflected from a face of the subject and produce video-rate images of the face of the subject; and an image processor configured to; locate an eye in the video-rate images; extract fatigue signatures from the located eye; determine a fatigue level of the subject, in part, from the fatigue signatures; locate a facial region away from the eye in the video-rate images; extract stress signatures from the located facial region; and determine a stress level of the subject from the stress signatures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for monitoring stress and fatigue of a subject, the system comprising:
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a light source configured to direct illuminating light onto a face of the subject, the light source comprising at least one infrared light emitting diode, the illuminating light having a spectrum that includes a first wavelength, the illuminating light reflecting off the face of the subject to form reflected light; collection optics that collect a portion of the reflected light and produce video-rate images of the face of the subject at the first wavelength, the collection optics comprising; a spectral filter that transmits wavelengths in a wavelength band that includes the first wavelength and blocks wavelengths outside the transmitted wavelength band; a lens configured to form an image of the face of the subject; and a detector configured to detect the image of the face of the subject at the first wavelength; and an image processor configured to; locate an eye in the video-rate images; extract fatigue signatures from the located eye, the fatigue signatures comprising at least one of eye behavior gaze, eye blinks, and eye closure rate; determine a fatigue level of the subject, in part, from the fatigue signatures; locate a facial region away from the eye in the video-rate images; extract stress signatures from the located facial region, the stress signatures comprising at least one of heart rate (HR), heart rate variability (HRV), and respiration rate (RR); and determine a stress level of the subject from the stress signatures. - View Dependent Claims (17)
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18. A method for monitoring stress and fatigue of a subject, the method comprising:
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receiving video-rate images of a face of the subject; locating an eye in the video-rate images; extracting fatigue signatures from the located eye; determining a fatigue level of the subject, in part, from the fatigue signatures; locating a facial region away from the eye in the video-rate images; extracting stress signatures from the located facial region; and determining a stress level of the subject from the stress signatures. - View Dependent Claims (19, 20)
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Specification