Autonomous Identification of Bridge Concrete Cracks Using Unmanned Aircraft Images and Improved Lightweight Deep Convolutional Networks

Table 2

Main parameters of the visual inspection system of UAS.

Main indicator	Parameter value
Visual system	Forward vision system; Downward-looking visual system
Speed measurement range	Flight speed ≤10 m/s (height 2 m, sufficient light)
Height measurement range	0–10 m
Precision hover range	0–10 m
Maximum video stream	60 mbps
Camera resolution	4000  3000 pixel