Fast initial guess estimation for digital image correlation
Abstract
Digital image correlation (DIC) is a widely used optical metrology for quantitative deformation measurement due to its noncontact, lowcost, highly precise feature. DIC relies on nonlinear optimization algorithm. Thus it is quite important to efficiently obtain a reliable initial guess. The most widely used method for obtaining initial guess is reliabilityguided digital image correlation (RGDIC) method, which is reliable but pathdependent. This pathdependent method limits the further improvement of computation speed of DIC using parallel computing technology, and error of calculation may be spread out along the calculation path. Therefore, a reliable and pathindependent algorithm which is able to provide reliable initial guess is desirable to reach full potential of the ability of parallel computing. In this paper, an algorithm used for initial guess estimation is proposed. Numerical and real experiments show that the proposed algorithm, adaptive incremental dissimilarity approximations algorithm (AIDA), has the following characteristics: 1) Compared with inverse compositional GaussNewton (ICGN) subpixel registration algorithm, the computational time required by AIDA algorithm is negligible, especially when subset size is relatively large; 2) the efficiency of AIDA algorithm is less influenced by search range; 3) the efficiency is less influenced by subset size; 4) it is easy to select the threshold for the proposed algorithm.
 Publication:

arXiv eprints
 Pub Date:
 October 2017
 arXiv:
 arXiv:1710.04359
 Bibcode:
 2017arXiv171004359T
 Keywords:

 Computer Science  Computer Vision and Pattern Recognition;
 Physics  Instrumentation and Detectors;
 Physics  Optics
 EPrint:
 The method does not have sufficient validations