Spatial averaging method based on adaptive weight for imaging photoplethysmography

SignificanceImaging photoplethysmography (iPPG) is a non-contact measuring technology for several physiological parameters reflecting personal health status without a special sensor. However, the pulse signal obtained using the iPPG usually is contaminated by various noises, and the intensity of the...

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Bibliographic Details
Published in:Journal of biomedical optics 2023-08, Vol.28 (8), p.85003-085003
Main Authors: Ryu, JongSong, Ryu, HyonSam, Liang, Shili, Hong, SunChol, Lian, Yueqi, Zheng, Zong
Format: Article
Language:English
Subjects:
Accuracy
Blood
Blood vessels
Cameras
Electrocardiography
Heart rate
Mathematical analysis
Parameters
Physiology
Sensors
Signal processing
Signal quality
Signal to noise ratio
Skin
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Summary:SignificanceImaging photoplethysmography (iPPG) is a non-contact measuring technology for several physiological parameters reflecting personal health status without a special sensor. However, the pulse signal obtained using the iPPG usually is contaminated by various noises, and the intensity of the interesting pulse signal is relatively weak compared to the noises, emphasizing the necessity of obtaining high-quality pulse signals to measure physiological parameters correctly.AimVarious regions of the face harbor distinct pulse information. We propose a spatial averaging method based on adaptive weights, which can obtain high-quality pulse signals by applying different weights to facial sub-regions of interest (sub-ROIs; sROIs).ApproachFirst, the facial ROI is divided into seven sROIs and the coarse heart rate (HR) is calculated from them. Next, the signal-to-noise ratio (SNR) of the raw signal obtained from each sROI is calculated using the coarse HR, and then a high-quality pulse signal is obtained by assigning positive or negative weights to each sROI based on the SNRs.ResultsWe compare our method with others through the quality analysis of the obtained pulse signals using the self-collected database and the public database PURE. The comparison results show that the proposed method can provide a better pulse signal compared to other methods under various resolutions and states.ConclusionsThis proposed method can obtain the pulse signal with better quality, which is helpful to accurately measure physiological parameters, such as HR and HR variability.
ISSN:1083-3668
1560-2281
DOI:10.1117/1.JBO.28.8.085003