A Crack Identification Method for Concrete Structures Using Improved U-Net Convolutional Neural Networks

Table 9

Comparison of crack widths.

Crack number	Plotting scale	Measured result	The number of pixels	Test results	Error value	Relative error (%)
1	0.0887	0.40	4.6	0.412	0.014	8.3
2	0.0887	0.38	4.1	0.367	0.008	8.5
3	0.0930	0.48	5.8	0.541	0.061	11.2
4	0.0930	0.37	4.6	0.472	0.059	14.1
5	0.0899	0.43	5.5	0.501	0.071	14.5
6	0.0899	0.63	4.6	0.413	0.053	13.0