Table 8.

Quality robustness assessment (accuracy) for grading.

Classifier		SVM				RF
Features selection		None	SURF [28]	Fisher	RF Gini	None	SURF [28]	Fisher	RF Gini
12_3_4	Acc.	0.466	0.464	0.529	0.557	0.607	0.493	0.571	0.586
1_23_4	Acc.	0.550	0.550	0.550	0.550	0.643	0.329	0.557	0.693
1_2_3_4	Acc.	0.207	0.300	0.450	0.507	0.486	0.350	0.393	0.521