Theoretical and Applied Mechanics Letters (May 2016)

Performance of global look-up table strategy in digital image correlation with cubic B-spline interpolation and bicubic interpolation

  • Zhiwei Pan,
  • Wei Chen,
  • Zhenyu Jiang,
  • Liqun Tang,
  • Yiping Liu,
  • Zejia Liu

DOI
https://doi.org/10.1016/j.taml.2016.04.003
Journal volume & issue
Vol. 6, no. 3
pp. 126 – 130

Abstract

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Global look-up table strategy proposed recently has been proven to be an efficient method to accelerate the interpolation, which is the most time-consuming part in the iterative sub-pixel digital image correlation (DIC) algorithms. In this paper, a global look-up table strategy with cubic B-spline interpolation is developed for the DIC method based on the inverse compositional Gauss–Newton (IC-GN) algorithm. The performance of this strategy, including accuracy, precision, and computation efficiency, is evaluated through a theoretical and experimental study, using the one with widely employed bicubic interpolation as a benchmark. The global look-up table strategy with cubic B-spline interpolation improves significantly the accuracy of the IC-GN algorithm-based DIC method compared with the one using the bicubic interpolation, at a trivial price of computation efficiency.

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