Table 2.

Classification accuracy of different feature band selection algorithms in SVM models.

Preprocessing Methods	Eight characteristic peaks		CARS		SPA
	Train	Vaild	Train	Vaild	Train	Vaild
airPLS	0.65	0.62	0.70	0.68	0.72	0.70
SG-airPLS	0.68	0.65	0.73	0.70	0.75	0.73
SG-airPLS-(1/SG)′	0.70	0.68	0.75	0.72	0.78	0.75
SG-airPLS-MSC	0.55	0.52	0.60	0.58	0.63	0.60
SG-airPLS-SNV	0.60	0.58	0.65	0.62	0.68	0.65
SG-airPLS-SS	0.63	0.60	0.68	0.65	0.70	0.68