Speckles and DIC or Checkerboards and LSA?

  • M. GrédiacEmail author
  • B. Blaysat
  • F. Sur
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


Two measurement techniques, namely DIC and LSA, are compared in this study. Both techniques consist in minimizing the optical residual. DIC performs the minimization in the real domain on speckles. LSA performs this minimization in the Fourier domain on periodic patterns such as checkerboards. It is shown here that for the same systematic error and the same spatial resolution, the noise level in displacement and strain maps is lower with LSA than with DIC.


Bias Checkerboard DIC LSA Random error Speckle optimization 


  1. 1.
    Grédiac, M., Blaysat, B., Sur, F.: A critical comparison of some metrological parameters characterizing local digital image correlation and grid method. Exp. Mech. 57(3), 871–903 (2017)CrossRefGoogle Scholar
  2. 2.
    Grédiac, M., Sur, F., Blaysat, B.: The grid method for in-plane displacement and strain measurement: a review and analysis. Strain. 52(3), 205–243 (2016)CrossRefGoogle Scholar
  3. 3.
    Bomarito, G.F., Hochhalter, J.D., Ruggles, T.J., Cannon, A.H.: Increasing accuracy and precision of digital image correlation through pattern optimization. Opt. Lasers Eng. 91, 73–85 (2017)CrossRefGoogle Scholar
  4. 4.
    Pan, B., Xie, H., Wang, Z., Qian, K., Wang, Z.: Study of subset size selection in digital image correlation for speckle patterns. Opt. Express. 16(10), 7078 (2008)CrossRefGoogle Scholar
  5. 5.
    Schreier, H.W., Sutton, M., Michael, A.: Systematic errors in digital image correlation due to undermatched subset shape functions. Exp. Mech. 42(3), 303–310 (2002)CrossRefGoogle Scholar
  6. 6.
    Sur, F., Grédiac, M.: Towards deconvolution to enhance the grid method for in-plane strain measurement. Inv Prob Imaging. 8(1), 259–291 (2014)MathSciNetCrossRefGoogle Scholar
  7. 7.
    Grédiac, M., Blaysat, B., Sur, F.: Beyond speckles and DIC: checkerboards and LSA. (2017)Google Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2019

Authors and Affiliations

  1. 1.Université Clermont Auvergne, SIGMA, Institut Pascal, UMR CNRS 6602Clermont-FerrandFrance
  2. 2.Université de Lorraine, CNRS, INRIA projet MagritVandoeuvre-lès-Nancy CedexFrance

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