物体面内位移测量中的两次傅立叶变换法

The Two-Step Fourier Transform Method in Displacement Measurement

两次傅立叶变换法是一种利用两次快速傅立叶变换及频率域滤波进行相关运算以提取物体变形信息的算法.通过采取快速傅立叶变换以及优化滤波减弱了图像噪声对相关波峰的影响,能快速、准确、实时的对相关点进行定位.

In this paper, a new speckle correlation method which is called two-step Fourier transform method is proposed to measure in-plane displacement. It performs two steps fast Fourier transforms and filtering in spectrum domain to calculate the deform information of the subject. By using the fast Fourier transform and optimized filter, the impact of image noise has been reduced, so we can estimate the correlation peak fast and accurate.