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

Table 8

Test results of arch bridge (tailwind, bottom).

Items	3 m	2.6 m	2.2 m	2.0 m	1.8 m	1.6 m
Level 0	0.989	0.99	0.988	0.979	0.978	0.849
Level 1	0.98	0.982	0.971	0.965	0.837	0.812
Level 2	0.981	0.975	0.961	0.932	0.83	0.805