Path-independent digital image correlation with high accuracy, speed and robustness

The initial guess transferring mechanism is widely used in iterative DIC algorithms and leads to path-dependence. Using the known deformation at a processed point to estimate the initial guess at its neighboring points could save considerable computation time, and a cogitatively-selected processing...

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Veröffentlicht in:Optics and lasers in engineering Jg. 65; S. 93 - 102
Hauptverfasser: Jiang, Zhenyu, Kemao, Qian, Miao, Hong, Yang, Jinglei, Tang, Liqun
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 01.02.2015
Schlagworte:
Accuracy
Algorithms
Computation
Deformation
Devices
Digital image correlation
Estimates
Fast Fourier transform
Gauss–Newton method
Inverse compositional algorithm
Path-independence
Robustness
Gauss–Newton method
Inverse compositional algorithm
Digital image correlation
Path-independence
Fast Fourier transform
ISSN:0143-8166, 1873-0302
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Zusammenfassung:The initial guess transferring mechanism is widely used in iterative DIC algorithms and leads to path-dependence. Using the known deformation at a processed point to estimate the initial guess at its neighboring points could save considerable computation time, and a cogitatively-selected processing path contributes to the improved robustness. In this work, our experimental study demonstrates that a path-independent DIC method is capable to achieve high accuracy, efficiency and robustness in full-field measurement of deformation, by combining an inverse compositional Gauss–Newton (IC-GN) algorithm for sub-pixel registration with a fast Fourier transform-based cross correlation (FFT-CC) algorithm to estimate the initial guess. In the proposed DIC method, the determination of initial guess accelerated by well developed software library can be a negligible burden of computation. The path-independence also endows the DIC method with the ability to handle the images containing large discontinuity of deformation without manual intervention. Furthermore, the possible performance of the proposed path-independent DIC method on parallel computing device is estimated, which shows the feasibility of the development of real-time DIC with high-accuracy. •This paper proposes a path-independent DIC method.•The proposed DIC method reaches high measurement accuracy at sub-pixel level.•The proposed DIC method shows excellent robustness for deformation discontinuity.•This work demonstrates the feasibility of real-time DIC with high accuracy.
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ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2014.06.011