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Monitoring Method of Bridge Structure Displacement Based on Camera Pinhole Model
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Jun-chen LIU1, Wei-zhu ZHU2, Zhi-xiang ZHOU2, *, Xi CHU2, Zi-meng SHEN1
Science Technology and Engineering | 2025, 25(1) : 383 - 393
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Science Technology and Engineering | 2025, 25(1): 383-393
• Papers·Traffics and Transportations •
Monitoring Method of Bridge Structure Displacement Based on Camera Pinhole Model
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Jun-chen LIU1, Wei-zhu ZHU2, Zhi-xiang ZHOU2, *, Xi CHU2, Zi-meng SHEN1
Affiliations
  • 1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • 2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China
Published: 2025-01-08 doi: 10.12404/j.issn.1671-1815.2308856
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The displacement response of a bridge is identified as a fundamental condition for the structural health monitoring and safety assessment of bridge structures. In order to fully leverage the advantages of machine vision for measuring structural displacements and to enhance its applicability, a structural displacement monitoring method based on the pinhole camera model was proposed. Sparse optical flow was employed to track structural feature points, achieving sub-pixel level image displacements. By employing the optical geometric relationships of camera imaging, an analytical solution was established between real-world displacements and image displacements. The image displacements were then substituted into algebraic relationships to obtain the true structural displacements. In the indoor experiments on dynamic load displacement identification of a simply supported bridge model, compared to the measurements obtained using a linear variable differential transformer displacement meter, the proposed method achieves a maximum error within 6% for pitch angles up to 30° and yaw angles up to 35°, thereby meeting the application requirements for monitoring the displacement deformations of bridge structures.

bridge engineering  /  computer vision  /  displacement monitoring  /  pinhole model  /  tilted photography
Jun-chen LIU, Wei-zhu ZHU, Zhi-xiang ZHOU, Xi CHU, Zi-meng SHEN. Monitoring Method of Bridge Structure Displacement Based on Camera Pinhole Model[J]. Science Technology and Engineering, 2025 , 25 (1) : 383 -393 . DOI: 10.12404/j.issn.1671-1815.2308856
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Year 2025 volume 25 Issue 1
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Article Info
doi: 10.12404/j.issn.1671-1815.2308856
  • Receive Date：2023-11-11
  • Online Date：2025-07-29
  • Published：2025-01-08
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History
  • Received：2023-11-11
  • Revised：2024-07-22
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Affiliations
    1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
    2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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