一种新的数字散斑搜索方法及其精度分析

A new Digital Speckle Correlation Method and its Precision Analysis

提出了一种新的改进的数字散斑相关的搜索方法—单区域搜索法。其特点是在一个子区的计算中 ,用梯度法得出的中心点的位移及导数项 ,将其代入弹性力学公式计算其它点的位移项初值 ,再用样条插值公式计算导数项的初值。该方法可在不降低精度的基础上极大地提高速度 ,是一个高效率、高精度的数字散斑搜索方法。本文还通过数值模拟的方法分析了该方法的精度。

A new method named single search of each subset was provided, which improves the speed of calculation, while its precision is not sacrificed. The character of this approach is as followed: the displacements and deformations of the center point of the subset are calculated through gradient iteration method,which are inserted into elastic mechanical formula to obtain the initial values of the displacements of other points in the subset, then derivatives are calculated by the bicubic spline interpolation as the initial values.The errors and precision were analyzed with numerically simulated image.