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Fusion of Embedded Vision and Intelligent Algorithms for Non-Contact Deformation Monitoring.

Mei Dong^1,2, Xinyu Liu¹, Hui Hu³

¹Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China.

Sensors (Basel, Switzerland)

|June 12, 2026

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This study introduces an intelligent vision-based system for non-contact structural monitoring. The framework achieves sub-millimeter accuracy in measuring deformations, enhancing the safety assessment of large civil engineering structures.

Area of Science:

Civil Engineering
Structural Health Monitoring
Computer Vision

Background:

Increasing demand for reliable structural safety assessment in service.
Urgency for high-precision, non-contact, and long-term deformation monitoring of large civil engineering structures.

Purpose of the Study:

Propose and validate a system-level non-contact monitoring framework.
Integrate embedded vision-based deformation sensing with intelligent algorithms for unified monitoring.
Enhance the stability and accuracy of deflection measurements in complex environments.

Main Methods:

Integrated framework combining high-precision optical imaging, subpixel localization, and intelligent image processing.
Continuous imaging and tracking of targets on structural surfaces for 2D dynamic displacement acquisition.

Keywords:

bridge deflection deformation monitoring intelligent vision sluice structure subpixel localization

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Hybrid algorithm using signal processing and image correction to compensate for image jitter, environmental disturbances, and camera vibrations.

Main Results:

Stable capture of small structural displacements with sub-millimeter measurement accuracy.
Successful field experiments on a girder bridge and an integral open-box sluice structure under various conditions.
Demonstrated feasibility and reliability of the vision-based system in complex engineering environments.

Conclusions:

The proposed intelligent vision-based deformation monitoring technology offers a new technical approach for structural safety assessment.
The system provides reliable operational monitoring for infrastructure like bridges and hydraulic structures.
Validated the effectiveness of the integrated framework for precise deformation measurement.