Optically Remote Noncontact Heart Rates Sensing Technique
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Author list: Thongkongoum W., Boonduang S., Limsuwan P.
Publisher: IOP Publishing
Publication year: 2017
Volume number: 901
Issue number: 1
ISSN: 1742-6588
eISSN: 1742-6596
Languages: English-Great Britain (EN-GB)
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Abstract
Heart rate monitoring via optically remote noncontact technique was reported in this research. A green laser (5 mW, 532ฑ10 nm) was projected onto the left carotid artery. The reflected laser light on the screen carried the deviation of the interference patterns. The interference patterns were recorded by the digital camera. The recorded videos of the interference patterns were frame by frame analysed by 2 standard digital image processing (DIP) techniques, block matching (BM) and optical flow (OF) techniques. The region of interest (ROI) pixels within the interference patterns were analysed for periodically changes of the interference patterns due to the heart pumping action. Both results of BM and OF techniques were compared with the reference medical heart rate monitoring device by which a contact measurement using pulse transit technique. The results obtained from BM technique was 74.67 bpm (beats per minute) and OF technique was 75.95 bpm. Those results when compared with the reference value of 75.43ฑ1 bpm, the errors were found to be 1.01% and 0.69%, respectively. ฉ Published under licence by IOP Publishing Ltd.
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