Study on PPG Biometric Recognition Based on Multifeature Extraction and Naive Bayes Classifier

Table 1

Summary of technologies or methods used for PPG biometrics.

Stage	Technology or method	Literature
Preprocessing	LPF	[17–20]
	BWF	[13, 21, 22]
	FD and SD	[17, 23]
	LPF, FD, and SD	[24]
	FIR, FD, and SD	[14, 25, 26]
	PD	[27]
	Sliding window	[28]
Feature extraction	TDF	[14, 19, 23–25, 27, 29]
	TDF and FDF	[26]
	DWT	[18]
	CWT	[21]
	LDA	[27]
	TDF and KLT	[22]
	SCW, FDF, and TDF	[20]
	Sparse softmax vector	[28]
Matching or classification	k-NN	[14, 18, 23]
	k-NN and MV	[27]
	LDC	[25]
	SVM	[18, 26]
	BN and k-NN	[24]
	PearsD	[21]
	Manhattan distance and Euclidean distance	[22]
	BN, NB, RBF, and MLP	[19]
	DCT	[30]
	SVM, GBT, and IsFrst	[20]
	k-NN, NB, RF, and LDC	[28]