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. 2018 Nov 27;6:e5859. doi: 10.7717/peerj.5859

Table 2. Comparison of the algorithmic steps of SB and the proposed SB-CWT.

SB (Wang et al., 2017c) SB-CWT
Signal decomposition FFT CWT using generalized Morse wavelet
rPPG signal extraction POS (Wang et al., 2017a) + alpha tuning (De Haan & Jeanne, 2013) POS (Wang et al., 2017a) + alpha tuning (De Haan & Jeanne, 2013)
Weighting function Ratio between the pulsatile amplitude and intensity variation amplitude Scale-dependent energy distribution
Signal transformation back into the time domain IFFT ICWT

Note:

CWT, continuous wavelet transform; FFT, fast Fourier transform; ICWT, inverse continuous wavelet transform; IFFT, inverse fast Fourier transform; POS, Plane-Orthogonal-to-Skin; rPPG, remote photoplethysmography.