Table 6: The classification and recognition performance comparison of SVM, RVM, and PSO-RS&SOCP-SVM.

Defect typeRustScratchOrange peelBubbleSurface crackRolled-in scale

The number of test samples100100100100100100
SVM
 Recognition rate (%)9997989610095
 The average running time (ms)63.567.678.680.269.368.5
RVM
 Recognition rate (%)10098999810096
 The average running time (ms)78.482.382.188.579.477.1
PSO-RS&SOCP-SVM
 Recognition rate (%)1001001009910098
 The average running time (ms)52.360.555.862.860.158.5