Fig. 2
From: Measurement of heart rate variability using off-the-shelf smart phones
Examples for using CWT to detrend and denoise. a The original C-rPPG signal. b The CWT coefficients of the original signal. Note that the black solid line denotes the representative frequency (scales) of pulse signal computed by (13). c The zoomed-in part of original signal. d The zoomed-in part of signal denoised by CWT-BP. e The zoomed-in part of signal denoised by CWT-MAX