Complex Background Removal Method for Video of an Inclined Cable Based on UAV Detection of Structural Vibration Frequencies

Table 12

Comparison of cable force estimation.

Condition	Method	Cable force (KN)	Absolute error (KN)	Mean relative error
Short-time condition	Accelerometer	3928.7766	0	0
	Region Growing	3937.1907	8.4141	0.21%
	K-Means	3932.8468	4.0702	0.10%
	RGv2	3932.8468	4.0702	0.10%
Long-time condition	Accelerometer	3925.2508	0	0
	Region Growing	3872.2841	52.9666	1.35%
	K-Means	3847.0094	78.2413	2.00%
	RGv2	3872.2841	52.9666	1.35%