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数字图像相关的多级网格初值估计方法
英文标题:Multi-level grid initial guess method for digital image correlation
作者:崔学习1 张家仙1 豆远航2 王宇2 吴向东2 万敏2 
单位:1. 北京航天试验技术研究所 北京 100074 2.北京航空航天大学 机械工程及自动化学院 北京 100191 
关键词:数字图像相关 初值估计 应变测量 位移测量 图像处理 
分类号:TP391
出版年,卷(期):页码:2025,50(5):283-293
摘要:

数字图像相关方法是一种基于数字图像处理的用于获取物体表面变形的非接触测量方法。针对现有的初值估计方法计算负荷较大的问题,提出一种基于已计算子区结果进行传递修正的多级网格(Multi-Level Grid,MLG)初值估计方法。首先,根据子区数量以及子区间隔将所有子区划分网格等级,0级网格间距最大,最高级网格取正常设定的子区间隔;然后,利用其他初值估计方法对子区间距最大的0级网格所有子区进行初值估计和迭代计算;最后,根据低层级网格子区的变形参数估计高一级的网格子区的变形参数初值,并进行迭代计算,循环执行直至完成所有级别的子区计算。所提出的算法利用经典“DIC挑战”中的图片进行验证,通过对比FFTCC整像素初值估计方法、基于特征点匹配的尺度不变特征变换初值估计方法和可靠性引导的初值传递方法,验证了所提出的算法可以有效提高整体初值估计准确性,进而降低ICGN迭代次数,提高算法整体执行速度。

The digital image correlation (DIC) method is a non-contact measurement technique based on digital image processing, used to capture the surface deformations of objects. Aiming at the problem of a large computational load in the existing initial guess method, a multi-level grid (MLG) initial guess method based on the transfer correction of calculated subest results was proposed. First, all subsets were divided into grid levels according to the number of subsets and subset intervals, the grid spacing of level 0 was the largest,and the highest-level grid selected the normal subset interval. Then, other initial guess methods were used to perform initial guess and iterative calculation on all subsets of level 0 grid with the largest subset interval. Finally, the initial value of deformation parameter for the higher-level grid subset was guessed based for the deformation parameter for the lower-level grid subset, and the iterative calculation was performed and cycled until the calculation of all levels of subsets were completed. The proposed algorithm is verified by using images from the classic “DIC Challenge”. By comparing the FFTCC integer pixel initial guess method, the scale-invariant feature transform (SIFT) initial guess method based on feature point matching and the reliability-guided initial value transfer method, it is verified that the proposed algorithm effectively improves the overall initial guess accuracy, thereby reducing the number of ICGN iterations and enhancing the overall execution speed of the algorithm. 

基金项目:
航天六院创新中心发展基金资助项目(2023Tm.YY5354Sd)
作者简介:
作者简介:崔学习(1989-),男,博士,工程师,E-mail:cuistudy2022@163.com;通信作者:豆远航(1998-),男,博士研究生,E-mail:douyuanhang@buaa.edu.cn
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