Journal
OPTICS AND LASERS IN ENGINEERING
Volume 52, Issue -, Pages 75-85Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2013.07.016
Keywords
Deformation measurement; Subpixel registration; Subset size; Self-adaptive algorithm; Gaussian window
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Funding
- National Basic Research Program of China [2013CB933702, 2011CB809106]
- National Natural Science Foundation of China [11002003, 11072004]
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Digital image correlation (DIC) technique has been increasingly employed to implement surface deformation measurements in many engineering fields. Practically, it has been demonstrated that the choice of subset sizes exerts a strong influence on measurement results of DIC, especially when there exists locally larger deformation over the subsets involved. This paper proposes a novel subpixel registration algorithm with Gaussian windows to implicitly optimize the subset sizes by adjusting the shape of Gaussian windows in a self-adaptive fashion with the aid of a so-called weighted zero-normalized sum-of-squared difference correlation criterion. The feasibility and effectiveness of the self-adaptive algorithm are carefully verified through a set of well-designed synthetic speckle images, which indicates that the presented algorithm is able to greatly enhance the accuracy and precision of displacement measurements as compared with the traditional subpixel registration methods. (C) 2013 Elsevier Ltd. All rights reserved.
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