Abstract
Heart rate monitoring via optically remote noncontact technique was reported in this research. A green laser (5 mW, 532±10 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 75.43±1 bpm, the errors were found to be 1.01% and 0.69%, respectively.
Highlights
The 3 electrodes ECG technique is the common method for measuring the sportsman heart rates activity
To eliminate the cables and contacts of the sensors, the green laser was projected onto the skin at the carotid artery of the sportsman
The movement of the reflected green laser on the screen was recorded by a digital camera (Canon EOS 1100D)
Summary
The 3 electrodes ECG (electrocardiography) technique is the common method for measuring the sportsman heart rates activity. The drawback is the limited movement of the sportsman due to the sensors and cables. The optically remote sensing technique was proposed. To eliminate the cables and contacts of the sensors, the green laser was projected onto the skin at the carotid artery of the sportsman. The periodically changes of the interference patterns of the reflected light were analysed for the heart rate values
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