基于曲面反射的单相机全景三维数字图像相关法

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关键词：全景测量；数字图像相关；单相机；内表面变形

中图分类号：0348.1 文献标识码：A

doi：10.37188/OPE.20253315.2478 CSTR：32169.14.OPE.20253315.2478

Single-camera panoramic 3D digital image correlation method based on curved surface reflection

MA Yancheng，WEN Qingfeng，SUI Shunshun，CHEN Yuze，WANG Yaqi，DAI Xiangjun* （School of Transportation and Vehicle Engineering，Shandong University of Technology， Zibo 255049，China） * Corresponding author， E-mail： daixiangjun@sdut. edu. cn

Abstract：A single-camera，dual-prism panoramic three-dimensional digital image correlation（3DDIC）method was developed to enable full 360∘ measurement of internal surface deformation and to evaluate its effectiveness for internal morphology characterization of circular pipes and pipeline defect detection. A single camera in conjunction with a double-prism optical arrangement is employed to reproduce a stereoscopic（dual-camera） imaging effect by refracting light through two prisms oriented at a prescribed angle，alowing simultaneous capture of left and right views.Panoramic observation of the entire inner surface is achieved via reflection from a convex mirror，providing continuous 360∘ coverage. Subsequent digital image correlation processing and coordinate transformation are performed on the acquired images to reconstruct the three-dimensional displacement field and strain distribution. Morphology experiments indicate a maximum absolute error of 0.4mm ，with the majority of measurement points exhibiting errors within 0.1mm . Deformation tests show a maximum relative error of 3.86% in comparison with strain gauge measurements. The proposed system demonstrates high accuracy and practicality， achieves simplified hardware through optical design，and enables high-precision measurement of iner pipesurface deformation.

Key words： panoramic measurement；digital image correlation； single camera； internal surface deforma-tion

1引言

在当代工程技术与科学研究领域，非接触式测量技术因其高效性和精确性而备受关注[1]。（剩余14386字）