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Title: Use of ambient light in remote photoplethysmographic systems: comparison between a high-performance camera and a low-cost webcam
Authors: Sun, Yu
Papin, Charlotte
Azorin-Peris, Vicente
Kalawsky, Roy S.
Greenwald, Stephen
Hu, Sijung
Keywords: Photoplethysmography
Complementary metal oxide semiconductor camera
Ambient light
Issue Date: 2012
Publisher: © Society of Photo-Optical Instrumentation Engineers
Citation: SUN, Y. ... et al., 2012. Use of ambient light in remote photoplethysmographic systems: comparison between a high-performance camera and a low-cost webcam. Journal of Biomedical Optics, DOI: 10.1117/1.JBO.17.3.037005.
Abstract: Imaging photoplethysmography (PPG) is able to capture useful physiological data remotely from a wide range of anatomical locations. Recent imaging PPG studies have concentrated on two broad research directions involving either high-performance cameras and or webcam-based systems. However, little has been reported about the difference between these two techniques, particularly in terms of their performance under illumination with ambient light. We explore these two imaging PPG approaches through the simultaneous measurement of the cardiac pulse acquired from the face of 10 male subjects and the spectral characteristics of ambient light. Measurements are made before and after a period of cycling exercise. The physiological pulse waves extracted from both imaging PPG systems using the smoothed pseudo-Wigner-Ville distribution yield functional characteristics comparable to those acquired using gold standard contact PPG sensors. The influence of ambient light intensity on the physiological information is considered, where results reveal an independent relationship between the ambient light intensity and the normalized plethysmographic signals. This provides further support for imaging PPG as a means for practical noncontact physiological assessment with clear applications in several domains, including telemedicine and homecare.
Description: © 2012 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Sponsor: This work was supported by the National Institute for Health Research under Grant No. PD1: II–FS–0109–11005.
Version: Published
DOI: 10.1117/1.JBO.17.3.037005
URI: https://dspace.lboro.ac.uk/2134/21288
Publisher Link: http://dx.doi.org/10.1117/1.JBO.17.3.037005
ISSN: 1083-3668
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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