Table 3.

Distribution of various types of targets.

Types	Training set	Validation set	Test set	Total
Total number of images	2043	120	241	2404
Proportion of the number of images	85 %	10 %	5 %	100 %
Number of crack targets	511	37	65	613
Number of broken targets	571	39	58	668
Target quantity of slag	641	29	89	759
Number of spot targets	551	37	61	649
Number of highlight targets	619	37	78	734
Total number of dataset targets	2893	179	351	3423