数字散斑相关的亚像素搜索方法比较

Comparison of sub-pixel searching methods in digital speckle correlation method

针对数字散斑相关方法中的二次曲面拟合、高斯曲面拟合、双线性插值、梯度法等常用的亚像素搜索技术进行了研究,建立亚像素搜索实验系统,对上述亚像素搜索技术的精度和效率进行了比较分析。结果表明,在上述几种方法中梯度法的搜索精度最高。

This paper makes studies on the common sub-pixel searching technologies such as quadric surface fitting, Gaussian surface fitting, bilinear interpolation and the gradient method in digital speckle correlation method （DSCM）. The sub-pixel searching system is built and the analysis on the accuracy and efficiency of these technologies is made. The result shows that the gradient method has the highest precision among all methods introduced by this paper.