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

Table 5

The detected frequency differences.

Condition	Method	1-2 (Hz)	2-3 (Hz)	3-4 (Hz)	4-5 (Hz)	5-6 (Hz)	Mean relative error
Short-time condition	Accelerometer	—	0.7109	0.7305	0.7276	0.7276	—
	K-Means	—	0.6993	0.6993	—	—	3.43%
	Region Growing	—	0.6985	0.7233	—	—	1.83%
	RGv2		0.6990	0.7239	0.7240	0.7240	0.89%
Long-time condition	Accelerometer	—	0.7110	0.7272	0.7298	0.7272	—
	K-Means	—	0.7273	0.7085	0.7179	0.7210	0.71%
	Region Growing	—	0.7211	0.7116	—	—	1.03%
	RGv2		0.7159	0.7187	0.7214	0.7186	0.71%