The Feasibility Assessment Study of Bridge Crack Width Recognition in Images Based on Special Inspection UAV

Table 17

Identification of image crack widths.

Items	C1	C2	C3
Object distance 1 (m)	5.09	5.09	7.05
Object distance 2 (m)	5.17	5.17	7.14
Object distance 3 (m)	5.31	5.31	7.18
Pixel resolution (mm/p)	0.258	0.258	0.364
Crack pixel count	2.27	2.41	2.21
Average crack width	0.58	0.63	0.81
Actual width (mm)	0.53	0.58	0.75
Accuracy	91.8%	92.6%	92.8%