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

Table 7

Vibration frequencies after the proposed method (unit: Hz).

Condition	Method	Mode 1	Mode 2	Mode 3	Mode 4	Mode 5	Mode 6
Short-time condition	Accelerometer	—	1.4553	2.1662	2.8966	3.6242	4.3518
	K-Means	—	1.4253	2.1625	2.8751	3.5878	4.3004
	Region Growing	—	1.4241	2.1486	2.8731	—	—
	RGv2	—	1.4241	2.1486	2.8731	3.5976	4.3221
Long-time condition	Accelerometer	—	1.4570	2.1680	2.8952	3.6250	4.3522
	K-Means	—	1.4331	2.1450	2.8662	3.5875	4.3087
	Region Growing	—	1.4331	2.1481	2.8662	—	—
	RGv2	—	1.4331	2.1481	2.8662	3.5875	4.3087