Integrating the Symmetry Image and Improved Sparse Representation for Railway Fastener Classification and Defect Recognition

Table 3

The recall rate (%) of different methods on the fastener database.

Number of the training samples of each subject	Intact fastener				Partially worn fastener				Missing fastener
	50	100	150	250	50	100	150	250	50	100	150	250
SVM	84.3	87.5	89.0	93.5	77.5	81.3	83.7	85.3	92.5	94.8	95.3	98.0
Improvement to SVM	88.8	91.2	95.8	96.3	89.5	91.6	95.7	98.5	94.5	96.8	97.3	98.5
NNA	86.3	88.5	92.8	94.5	81.6	83.3	87.8	92.3	91.5	94.3	95.8	97.3
Improvement to NNA	87.5	89.8	94.5	96.5	89.8	91.3	96.8	99.0	92.5	95.8	96.3	97.8
SRC	87.3	89.3	93.3	95.5	85.5	88.3	89.8	91.3	94.3	94.8	96.3	97.5
Improvement to SRC	89.8	90.3	95.8	96.3	89.3	93.7	97.5	96.8	94.8	95.5	97.2	98.3