Table 3.

Comparison of studies (Currency).

Authors	Year	Dataset	Range (Acquisition)	Methods (Processing)	Accuracy
Baek et al.	2018	Own dataset	VNIR	PCA, SVM	99.89%
			VIS, IR	Own Algorithm	98.66%
Kang et al.	2016	Own dataset	VIS, IR	Own Algorithm	99.97%
Correia et al.	2018	Own dataset	NIR	PCA, PLS-DA	100%
Vila et al.	2006	Own dataset	IR	PCA	N/A
Lim et al.	2017	Own dataset	NIR	Own Algorithm	N/A
Hoyo-Meléndez et al.	2016	Own dataset	VNIR	Envi 5.0	N/A