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Article Dans Une Revue Experimental Mechanics Année : 2022

Designing Patterns for DIC with Poisson Image Editing

Y. Shi
  • Fonction : Auteur
B. Blaysat
  • Fonction : Auteur
H. Chanal
  • Fonction : Auteur
M. Grédiac
  • Fonction : Auteur
  • PersonId : 1038622

Résumé

Background: The pattern used in DIC directly influences the quality of the measurement obtained with this technique, so it is of prime importance to optimize the geometry of the features characterizing the pattern to achieve the best metrological performance. Objective: The primary objective of this study is to quantify the influence of the collinearity between the actual displacement and the pattern image gradient on the systematic and random errors affecting displacement fields measured by DIC. Methods: Poisson Image Editing (PIE), a technique borrowed from the image processing community where it was introduced to perform seamless cloning of images, has been employed here to render various patterns whose gradient is globally collinear to the displacement field. Directly integrating the displacement field considered as the image gradient does not lead to a sufficiently contrasted pattern. A texture is therefore superposed to the displacement field before integration. Results: Different patterns obtained or not by PIE are compared, and it is shown with suitable simulations performed with synthetic images that rendering a pattern where the image gradient is globally collinear to the displacement significantly reduces the total error affecting the measurements. The value of this improvement depends on the texture added to the displacement field before applying PIE. Conclusion: 1 This study demonstrates that the collinearity between the speckle image gradient and the displacement field reduces the error affecting the displacement fields measured by DIC. It also proposes a route to account for this displacement in the design of an optimized pattern when a priori knowledge on the direction of the displacement is available. If not, it is shown that a small checkerboard inlayed in a larger one leads to a metrological performance much better than that obtained with a classic random pattern, and close to that achieved with an optimized pattern for which the displacement field is accounted for.
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Dates et versions

hal-03784274 , version 1 (22-09-2022)

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Citer

Y. Shi, B. Blaysat, H. Chanal, M. Grédiac. Designing Patterns for DIC with Poisson Image Editing. Experimental Mechanics, 2022, 62 (7), pp.1093-1117. ⟨10.1007/s11340-022-00862-6⟩. ⟨hal-03784274⟩
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