Abstract
The present invention relates to a system and method for determining at least one vital sign of a subject. To improve the ambient light robustness, said system comprises an illumination unit (2) configured to illuminate a skin region of the subject, said illumination unit comprising a first radiation source (20) and a second radiation source (21), which are configured to emit differently modulated electromagnetic radiation in two or more wavelength channels and/or in two or more polarization channels, a detection unit (4) configured to detect electromagnetic radiation reflected from the skin region of the subject and to generate detection signals, wherein the detection unit (4) comprises a plurality of detection elements and wherein a detection signal is generated per detection element or group of two or more detection elements, a processing unit (11) configured to demodulate the detection signals corresponding to the modulation applied by the illumination unit to obtain demodulated detection signals, and a vital signs determination unit (5) configured to determine, per wavelength or polarization channel, a statistical measure from said demodulated detection signals at the same instant of time and to extract a vital sign from said statistical measures.
| Original language | English |
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| Patent number | US2021219884 |
| Publication status | Published - 22 Jul 2021 |