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A fast digital image correlation method for deformation measurement

机译：一种用于变形测量的快速数字图像相关方法

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摘要

Fast and high-accuracy deformation analysis using digital image correlation (DIC) has been increasingly important and highly demanded in recent years. In literature, the DIC method using the Newton-Rapshon (NR) algorithm has been considered as a gold standard for accurate sub-pixel displacement tracking, as it is insensitive to the relative deformation and rotation of the target subset and thus provides highest sub-pixel registration accuracy and widest applicability. A significant drawback of conventional NR-algorithm-based DIC method, however, is its extremely huge computational expense. In this paper, a fast DIC method is proposed deformation measurement by effectively eliminating the repeating redundant calculations involved in the conventional NR-algorithm-based DIC method. Specifically, a reliability-guided displacement scanning strategy is employed to avoid time-consuming integer-pixel displacement searching for each calculation point, and a pre-computed global interpolation coefficient look-up table is utilized to entirely eliminate repetitive interpolation calculation at sub-pixel locations. With these two approaches, the proposed fast DIC method substantially increases the calculation efficiency of the traditional NR-algorithm-based DIC method. The performance of proposed fast DIC method is carefully tested on real experimental images using various calculation parameters. Results reveal that the computational speed of the present fast DIC is about 120-200 times faster than that of the traditional method, without any loss of its measurement accuracy.
机译：近年来，使用数字图像相关技术（DIC）进行快速，高精度的变形分析已变得越来越重要，并且需求也越来越高。在文献中，使用牛顿-拉普松（NR）算法的DIC方法已被视为精确跟踪亚像素位移的黄金标准，因为它对目标子集的相对变形和旋转不敏感，因此可提供最高的子像素像素配准精度和最广泛的适用性。然而，传统的基于NR算法的DIC方法的显着缺点是其极大的计算费用。本文提出了一种快速的DIC方法，通过有效消除传统的基于NR算法的DIC方法所涉及的重复冗余计算，来进行变形测量。具体而言，采用可靠性指导的位移扫描策略来避免对每个计算点进行耗时的整数像素位移搜索，并且使用预先计算的全局插值系数查找表来完全消除子像素处的重复插值计算位置。通过这两种方法，提出的快速DIC方法大大提高了传统的基于NR算法的DIC方法的计算效率。提出的快速DIC方法的性能是使用各种计算参数在真实的实验图像上进行仔细测试的。结果表明，当前快速DIC的计算速度比传统方法快约120-200倍，而不会降低其测量精度。

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