Investigation of Five Algorithms for Selection of the Optimal Region of Interest in Smartphone Photoplethysmography

<div>Heart rate estimation from the smartphone photoplethysmographic signal. (a) The filtered average intensity of the optimal region of interest selected by the VAR algorithm. (b) The frequency spectrum of (a).</div>

Journal of Sensors

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Figure 3

Figure 3: Investigation of Five Algorithms for Selection of the Optimal Region of Interest in Smartphone Photoplethysmography 