A Three-Camera Digital Image Correlation System For Full-Field 3D Shape and Motion Measurement

IF 0.5 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Evaluation Pub Date : 2022-11-01 DOI:10.32548/2022.me-04293

L. Luan, Liam Crosbie

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引用次数: 0

Abstract

A cluster-approach-based three-camera digital image correlation (DIC) system is introduced for full-field 3D shape and motion measurement. In this system, three cameras are employed to measure the same specimen area at different viewing angles. Data points within the region of interest can be evaluated by arbitrary camera pairs as a stereo DIC system so that data points with the smallest 3D residuum are selected and mapped into one common coordinate system. Two stationary shape measurements and one out-of-plane motion measurement were carried out with the three-camera DIC system. Test results were analyzed based on the same image series, projection calibration, and correlation parameters, but compared using different camera combinations (i.e., three-camera and two-camera data). Three-camera test results show not only an improved surface coverage due to the additional camera viewing angle for uneven specimen surfaces, but also a smaller and more homogenous distributed measurement uncertainty compared to the two-camera test results. The selection of data points with the smallest 3D residuum evaluated from any arbitrary camera pairs enables a better tolerance of the three-camera DIC system against various measurement error sources such as limited depth of field, lens distortion, and speckle pattern distortion due to tilted camera viewing angles.

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一种用于全视场三维形状和运动测量的三摄像头数字图像相关系统

介绍了一种基于聚类方法的三摄像头数字图像相关(DIC)系统，用于全视野三维形状和运动测量。在该系统中，使用三台摄像机在不同视角下测量同一样品区域。感兴趣区域内的数据点可以由任意相机对作为立体DIC系统进行评估，以便选择具有最小三维残差的数据点并映射到一个公共坐标系中。利用三相机DIC系统进行了两次静止形状测量和一次面外运动测量。测试结果基于相同的图像序列、投影校准和相关参数进行分析，但使用不同的相机组合(即三相机和双相机数据)进行比较。三相机测试结果表明，由于增加了相机视角，对于不均匀的样品表面，不仅提高了表面覆盖率，而且与双相机测试结果相比，分布测量不确定性更小，更均匀。从任意相机对中选择具有最小3D残余的数据点，使三相机DIC系统能够更好地容忍各种测量误差源，如有限的景深，镜头畸变和由于倾斜相机视角引起的散斑图案畸变。

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来源期刊

Materials Evaluation 工程技术-材料科学：表征与测试

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.