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Table 1 Fundamental frequency (Hz) of six pedestrian bridges measured and extracted by three different camera placements and accelerometers (Accs), and calculated by structural analysis with SAP2000

From: Bridge vibration measurements using different camera placements and techniques of computer vision and deep learning

 

Remote

Accs

Structure-mounted

Accs

Drone-mounted

Accs

Structural analysis

CPB-1

M: 3.99 (L: 3.99)

4.03

M: 4.02 (L: 4.02)

3.99

D-: 4.04 (F-: 4.02)

3.99

4.04

CPB-2

M: 5.44 (L: 5.44)

5.44

M: 5.49 (L: 5.47)

5.47

D-: 5.45 (F-: 4.94)

5.45

5.44

CPB-3

M: 5.43 (L: 5.43)

5.43

M: 5.47 (L: 5.45)

5.45

  

5.44

CPB-4

M: 3.84 (L: 3.84)

3.85

M: 3.84 (L: 3.84)

3.85

D-: 3.91 (F-: 3.87)

3.84

3.88

CPB-5

M: 4.68 (L: 4.68)

4.66

M: 4.69 (L: 4.62)

4.64

D-: 4.70 (F-: 4.68)

4.59

4.75

CPB-6

M: 4.61 (L: 4.61)

4.62

M: 4.61 (L: 4.62)

4.61

D-: 4.68 (F-: 4.68)

4.60

4.75

  1. Remote, Structure- and Drone- stand for remote, structure-mounted and drone-mounted cameras. M and L stand for the Mask R-CNN + SIFT and LK tracker methods, respectively. D- and F- refer to displacement subtraction and frequency subtraction