Accurate measurements of panoramic/dual-surface kinematic fields are essential to elastoplastic mechanics for the determination of true stress-strain curves, through-thickness strain and the identification of 3D anisotropic parameters. Recently, a novel mirror-assisted multi-view digital image correlation (DIC) method that uses only a two-camera stereo-DIC system and two auxiliary planar mirrors was proposed. It has been convincingly demonstrated to be a cost-efficient and effective technique for measuring 360-deg panoramic/dual-surface kinematic fields. Nevertheless, in this method, the mirrors need to be partly decorated with speckle patterns and the latter clearly captured by the cameras to estimate the reflection transformation of both mirrors. Capturing the speckle patterns on the two mirrors occupies a part of the precious spatial resolution of the cameras, considerably reducing the effective spatial resolution left for the DIC measurement. In this work, an alternative method for estimating the reflection transformation is proposed to improve the spatial resolution of the mirror-assisted multi-view DIC. This method estimates the reflection transformation of the two mirrors by adjusting the mirrors to three or more diverse poses, thus eliminating the need of speckling the mirrors. A set of real tests were carried out, and the results well demonstrated the accuracy and effectiveness of the proposed method.

中文翻译：

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具有改进空间分辨率的镜面辅助多视图数字图像相关

全景/双表面运动场的准确测量对于弹塑性力学至关重要，可用于确定真实的应力-应变曲线、全厚度应变和 3D 各向异性参数的识别。最近，提出了一种新颖的镜面辅助多视图数字图像相关 (DIC) 方法，该方法仅使用两相机立体 DIC 系统和两个辅助平面镜。它已被令人信服地证明是一种用于测量 360 度全景/双表面运动场的经济高效的技术。然而，在这种方法中，镜子需要部分装饰有斑点图案，后者由相机清楚地捕获以估计两个镜子的反射变换。捕获两个反射镜上的散斑图案占用了相机宝贵的空间分辨率的一部分，大大降低了为 DIC 测量留下的有效空间分辨率。在这项工作中，提出了一种估计反射变换的替代方法，以提高镜面辅助多视图 DIC 的空间分辨率。这种方法通过将镜子调整到三个或更多不同的姿势来估计两个镜子的反射变换，从而消除了对镜子散斑的需要。进行了一组实际测试，结果很好地证明了所提出方法的准确性和有效性。提出了一种估计反射变换的替代方法，以提高镜面辅助多视图 DIC 的空间分辨率。这种方法通过将镜子调整到三个或更多不同的姿势来估计两个镜子的反射变换，从而消除了对镜子散斑的需要。进行了一组实际测试，结果很好地证明了所提出方法的准确性和有效性。提出了一种估计反射变换的替代方法，以提高镜面辅助多视图 DIC 的空间分辨率。这种方法通过将镜子调整到三个或更多不同的姿势来估计两个镜子的反射变换，从而消除了对镜子散斑的需要。进行了一组实际测试，结果很好地证明了所提出方法的准确性和有效性。