Table 5. Performance of schema (7) using an over-complete dictionary with different sizes and different sample sizes and schema (8) for different over-complete dictionary sizes.

Schema	Image size	Number of images belonging to each class in the over-complete dictionary		Accuracy	Sensitivity	Specificity
		Negative samples	Positive samples
(7)	15 × 20	20	50	0.5623	0	0.9910
		20	60	0.5757	0.0147	0.9850
		15	70	0.5808	0.0088	0.9936
		10	70	0.5845	0.0942	0.9384
		5	70	0.5931	0.1059	0.9488
	5 × 10	10	80	0.5792	0.0303	0.9678
		10	75	0.5730	0.0746	0.9313
		3	75	0.5916	0.1400	0.0888
		5	75	0.5943	0.1224	0.9299
		5	70	0.5993	0.1882	0.8960
(8)	—	20	50	0.5732	0.0265	0.9721
		10	70	0.5734	0.0265	0.9682
		10	75	0.5796	0.0091	0.9768
		5	75	0.5801	0.0515	0.9474
		1	80	0.5826	0.0636	0.9432