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Camera motion-induced systematic errors in stereo-DIC and speckle-based compensation method
Optics and Lasers in Engineering ( IF 4.6 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.optlaseng.2021.106809
Xinxing Shao , Xiaoyuan He

Stereo-digital image correlation (stereo-DIC) is now a standard technique for determination of the mechanical properties of materials and structures. In stereo-DIC, cameras are assumed to be motionless after camera calibration, so the three-dimensional (3D) reconstruction can be implemented using pre-calibrated parameters. However, this assumption is not true in some situations, such as drop test, seismic shaking table test and non-laboratory environment. Due to the presence of ground shaking or wind blowing, it's almost impossible to avoid camera motion in these experiments even if mechanical fixing is adopted. Camera motion during the experiment can undoubtedly introduce significant errors on measured results. Generally, camera motion can be divided into pair motion and relative motion. The influence of these two kinds of motion on stereo-DIC measurement is different and worth of separate study. Keep this in mind, in this paper, the influence of camera motion on stereo-DIC is investigated and the effects of pair motion and relative motion are examined separately using precisely controllable simulated experiments. Specifically, by integrating into the stereo matching, the speckle-based compensation method for relative motion is proposed and the accuracy of the compensation methods is analyzed in detail. The reduction of camera motion-induced systematic errors will be helpful for the further applications of stereo-DIC in non-laboratory environments and engineering fields.



中文翻译:

立体DIC和基于斑点的补偿方法中相机运动引起的系统误差

立体数字图像相关 (stereo-DIC) 现在是确定材料和结构机械性能的标准技术。在立体 DIC 中,假设相机在相机校准后静止不动,因此可以使用预校准参数实现三维 (3D) 重建。然而,这种假设在某些情况下并不成立,例如跌落试验、地震振动台试验和非实验室环境。由于地面震动或风吹的存在,即使采用机械固定,在这些实验中也几乎不可能避免相机运动。实验过程中的相机运动无疑会给测量结果带来重大误差。通常,相机运动可分为对运动和相对运动。这两种运动对立体DIC测量的影响是不同的,值得单独研究。请记住这一点,在本文中,研究了相机运动对立体 DIC 的影响,并使用精确可控的模拟实验分别检查了成对运动和相对运动的影响。具体而言,通过融入立体匹配,提出了基于散斑的相对运动补偿方法,并详细分析了补偿方法的准确性。减少相机运动引起的系统误差将有助于立体 DIC 在非实验室环境和工程领域的进一步应用。研究了相机运动对立体 DIC 的影响,并使用精确可控的模拟实验分别检查了对运动和相对运动的影响。具体而言,通过融入立体匹配,提出了基于散斑的相对运动补偿方法,并详细分析了补偿方法的准确性。减少相机运动引起的系统误差将有助于立体 DIC 在非实验室环境和工程领域的进一步应用。研究了相机运动对立体 DIC 的影响,并使用精确可控的模拟实验分别检查了对运动和相对运动的影响。具体而言,通过融入立体匹配,提出了基于散斑的相对运动补偿方法,并详细分析了补偿方法的准确性。减少相机运动引起的系统误差将有助于立体 DIC 在非实验室环境和工程领域的进一步应用。

更新日期:2021-09-24
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