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Multi-Camera 3D Digital Image Correlation with Pointwise-Optimized Model-Based Stereo Pairing.

Wenxiang Qin1, Feiyue Wang1, Shaopeng Hu2

  • 1Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima 739-8527, Japan.

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|September 27, 2025
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Summary
This summary is machine-generated.

A new method, MPMC-DIC, optimizes multi-camera digital image correlation (MC-DIC) for dynamic deformation measurement. It improves accuracy and robustness by intelligently pairing cameras, overcoming limitations of existing techniques.

Keywords:
3D dynamic deformation measurement3D modelautomatic camera pairingdigital image correlationmulti-camera geometry

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Area of Science:

  • Engineering
  • Measurement Science
  • Computer Vision

Background:

  • Dynamic deformation measurement (DDM) is crucial for infrastructure and industry.
  • Multi-camera digital image correlation (MC-DIC) offers non-contact 3D DDM but suffers from inefficient camera pairing and over-grouping.
  • Existing methods lead to complex setups and inaccurate deformation measurements.

Purpose of the Study:

  • To introduce a novel MC-DIC method for precise and robust dynamic deformation measurement.
  • To overcome the limitations of manual or simplistic camera pairing strategies in MC-DIC.
  • To enable accurate DDM of semi-rigid objects even with complex backgrounds.

Main Methods:

  • Proposed a pointwise-optimized model-based stereo pairing (MPMC-DIC) method.
  • Developed an automated system for evaluating and selecting optimal camera pairs based on five key factors.
  • Utilized 3D model information and calibrated camera data for pair selection.

Main Results:

  • Achieved high-precision DDM with an accuracy of 0.03 mm for displacements up to 5.0 mm in a cylinder experiment.
  • Demonstrated robustness against cluttered backgrounds using a 2x4 camera array.
  • Successfully performed wide-range dynamic deformation analysis on a vibrating PC speaker with complex geometry.

Conclusions:

  • MPMC-DIC effectively overcomes the over-grouping problem in MC-DIC.
  • The proposed method enhances accuracy and robustness in dynamic deformation measurement.
  • MPMC-DIC is suitable for analyzing dynamic deformations in complex scenarios and geometries.