Intelligent Crack Detection and Quantification in the Concrete Bridge: A Deep Learning-Assisted Image Processing Approach

Table 2

Quantitative results of crack width.

Crack number	The width measured by a crack width gauge (mm)	Quantized mean width (mm)	Absolute error (mm)	Relative error (%)
#101	0.40	0.39	−0.01	−2.5
#102	0.30	0.28	−0.02	−6.7
#103	0.26	0.29	0.03	11.5
#104	0.31	0.34	0.03	9.7
#105	0.29	0.27	−0.02	−6.9
#106	0.18	0.19	0.01	5.6
#107	0.45	0.47	0.02	4.4
#108	0.40	0.37	−0.03	−7.5
#109	0.40	0.38	−0.02	−5.0
#110	0.40	0.41	0.01	2.5
#111	0.31	0.34	0.03	9.7
#112	0.35	0.39	0.04	11.4