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Evaluation of sub-pixel displacement measurement algorithms in digital image correlation

机译:数字图像相关中亚像素位移测量算法的评估

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The accuracy of digital image correlation method is based on the sub-pixel displacement measurement algorithm. In this paper, four kinds of commonly used sub-pixel displacement measurement algorithms, including Newton-Raphson method, curved surface fitting method, gradient-based algorithm and iterative and spatial-gradient algorithm, are introduced. The performances of the four methods are compared using computer-simulated images. The results show that the iterative and spatial-gradient algorithm can obtain the most accurate and stable results of displacement measurement under various conditions. In addition, this algorithm is simple and easy to implement. Therefore, the performances of this algorithm are the best.
机译:数字图像相关方法的准确性基于亚像素位移测量算法。本文介绍了四种常用的亚像素位移测量算法,包括牛顿-拉夫森法,曲面拟合法,基于梯度的算法以及迭代和空间梯度算法。使用计算机模拟的图像比较了这四种方法的性能。结果表明,迭代和空间梯度算法可以在各种条件下获得最准确,最稳定的位移测量结果。另外,该算法简单易实现。因此,该算法的性能是最好的。

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