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Volume: 31 | Article ID: art00012
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Self-contained, passive, non-contact, photoplethysmography: Real-time extraction of heart rates from live view within a Canon Powershot
  DOI :  10.2352/ISSN.2470-1173.2019.13.COIMG-146  Published OnlineJanuary 2019
Abstract

Photoplethysmography (PPG) is the detection of blood flow or pressure by optical means. The most common method involves direct skin-contact measurement of light from an LED. However, the small color changes in skin under normal lighting conditions, as recorded by conventional video, potentially allow passive, non-contact, PPG. A variety of methods have been applied to extract heartrate from such a video. In another paper submitted to this conference by the same authors, a new processing algorithm based on autocorrelation is shown to be effective without needing extensive video preprocessing to enhance the signal. That method was implemented using floating-point arithmetic in MatLab to analyze complete videos. However, the algorithm’s structure suggested that it might be possible to create a simplified, integer-only, approximation that is entirely incremental: updating a heart rate estimate as each frame is captured. This new, simplified, incremental algorithm allows a reprogrammed Canon PowerShot camera to function as a stand-alone, passive, non-contact, PPG device. The incremental integer algorithm and implementation are explained and evaluated in this paper.

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Henry Dietz, Chadwick Parrish, Kevin D. Donohue, "Self-contained, passive, non-contact, photoplethysmography: Real-time extraction of heart rates from live view within a Canon Powershotin Proc. IS&T Int’l. Symp. on Electronic Imaging: Computational Imaging XVII,  2019,  pp 146-1 - 146-7,  https://doi.org/10.2352/ISSN.2470-1173.2019.13.COIMG-146

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