A Fast and Effective Image Preprocessing Method for Hot Round Steel Surface

Table 6

Experimental results of initial defect detection.

	Defect	Training time (h)	Detection time (ms)	Detection rate (%)
PCA	Scratch defect	1.36	6.58	100
	Rolling skin	1.57	6.77	98
	Crack defect	1.23	6.98	94
	Wire ear defect	1.28	7.21	98
PCA and genetic algorithm	Scratch defect	2.74	2.17	100
	Rolling skin	2.85	2.76	100
	Crack defect	2.32	2.85	100
	Wire ear defect	2.38	2.14	100