Table 2.

Average prediction error obtained by single feature of single image component

Image component	Average prediction error
	Image feature
	FOS	HOG	LBP	GLCM	Prewitt
Full color component	± 3.02	± 3.60	–	–	–
Red color component	± 2.86	± 3.39	± 3.13	± 2.80	± 2.90
Green color component	± 2.81	± 3.48	± 3.08	± 2.80	± 2.90
Blue color component	± 2.89	± 3.14	± 3.05	± 2.71	± 2.98
Gray component	± 2.82	± 3.98	± 3.11	± 2.80	± 3.03