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Title:Multi-level grid initial guess method for digital image correlation
Authors: Cui Xuexi1 Zhang Jiaxian1 Dou Yuanhang2 Wang Yu2 Wu Xiangdong2 Wan Min2 
Unit: 1.Beijing Institute of Aerospace Testing Technology  Beijing 100074  China 2. School of Mechanical Engineering & Automation  Beihang University  Beijing 100191  China 
KeyWords: digital image correlation  initial guess  strain measurement  displacement measurement  image processing 
ClassificationCode:TP391
year,vol(issue):pagenumber:2025,50(5):283-293
Abstract:

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. 

Funds:
航天六院创新中心发展基金资助项目(2023Tm.YY5354Sd)
AuthorIntro:
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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