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Evaluation of digital image correlation techniques using realistic ground truth speckle images

Corneliu Cofaru (UGent) , Wilfried Philips (UGent) and Wim Van Paepegem (UGent)
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Abstract
Digital image correlation (DIC) has been acknowledged and widely used in recent years in the field of experimental mechanics as a contactless method for determining full field displacements and strains. Even though several sub-pixel motion estimation algorithms have been proposed in literature, little is known about their accuracy and limitations in reproducing complex underlying motion fields occurring in real mechanical tests. This paper presents a new method for evaluating sub-pixel motion estimation algorithms using ground truth speckle images that are realistically warped using artificial motion fields that were obtained following two distinct approaches: in the first, the horizontal and vertical displacement fields are created according to theoretical formulas for the given type of experiment while the second approach constructs the displacements through radial basis function interpolation starting from real DIC results. The method is applied in the evaluation of five DIC algorithms with results indicating that the gradient based DIC methods generally have a quality advantage when using small sized blocks and are a better choice for calculating very small displacements and strains. The Newton-Raphson is the overall best performing method with a notable quality advantage when large block sizes are employed and in experiments where large strain fields are of interest.
Keywords
interpolation, sub-pixel, speckle, digital image correlation, RADIAL BASIS FUNCTION, BASIS FUNCTION INTERPOLATION, REGISTRATION ALGORITHMS, GRADIENT, MOTION, PLATE

Citation

Please use this url to cite or link to this publication:

MLA
Cofaru, Corneliu, Wilfried Philips, and Wim Van Paepegem. “Evaluation of Digital Image Correlation Techniques Using Realistic Ground Truth Speckle Images.” MEASUREMENT SCIENCE & TECHNOLOGY 21.5 (2010): n. pag. Print.
APA
Cofaru, C., Philips, W., & Van Paepegem, W. (2010). Evaluation of digital image correlation techniques using realistic ground truth speckle images. MEASUREMENT SCIENCE & TECHNOLOGY, 21(5).
Chicago author-date
Cofaru, Corneliu, Wilfried Philips, and Wim Van Paepegem. 2010. “Evaluation of Digital Image Correlation Techniques Using Realistic Ground Truth Speckle Images.” Measurement Science & Technology 21 (5).
Chicago author-date (all authors)
Cofaru, Corneliu, Wilfried Philips, and Wim Van Paepegem. 2010. “Evaluation of Digital Image Correlation Techniques Using Realistic Ground Truth Speckle Images.” Measurement Science & Technology 21 (5).
Vancouver
1.
Cofaru C, Philips W, Van Paepegem W. Evaluation of digital image correlation techniques using realistic ground truth speckle images. MEASUREMENT SCIENCE & TECHNOLOGY. 2010;21(5).
IEEE
[1]
C. Cofaru, W. Philips, and W. Van Paepegem, “Evaluation of digital image correlation techniques using realistic ground truth speckle images,” MEASUREMENT SCIENCE & TECHNOLOGY, vol. 21, no. 5, 2010.
@article{803826,
  abstract     = {Digital image correlation (DIC) has been acknowledged and widely used in recent years in the field of experimental mechanics as a contactless method for determining full field displacements and strains. Even though several sub-pixel motion estimation algorithms have been proposed in literature, little is known about their accuracy and limitations in reproducing complex underlying motion fields occurring in real mechanical tests. This paper presents a new method for evaluating sub-pixel motion estimation algorithms using ground truth speckle images that are realistically warped using artificial motion fields that were obtained following two distinct approaches: in the first, the horizontal and vertical displacement fields are created according to theoretical formulas for the given type of experiment while the second approach constructs the displacements through radial basis function interpolation starting from real DIC results. The method is applied in the evaluation of five DIC algorithms with results indicating that the gradient based DIC methods generally have a quality advantage when using small sized blocks and are a better choice for calculating very small displacements and strains. The Newton-Raphson is the overall best performing method with a notable quality advantage when large block sizes are employed and in experiments where large strain fields are of interest.},
  author       = {Cofaru, Corneliu and Philips, Wilfried and Van Paepegem, Wim},
  issn         = {0957-0233},
  journal      = {MEASUREMENT SCIENCE & TECHNOLOGY},
  keywords     = {interpolation,sub-pixel,speckle,digital image correlation,RADIAL BASIS FUNCTION,BASIS FUNCTION INTERPOLATION,REGISTRATION ALGORITHMS,GRADIENT,MOTION,PLATE},
  language     = {eng},
  number       = {5},
  title        = {Evaluation of digital image correlation techniques using realistic ground truth speckle images},
  url          = {http://dx.doi.org/10.1088/0957-0233/21/5/055102},
  volume       = {21},
  year         = {2010},
}

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