The impact of metrics in mechanical imaging

Optical Flow (OF) is an alternative technique to the more classical digital image correlation methods (DIC), able to measure the motion between two images. It is a pixel-wise method, in the sense that the displacement is defined at each pixel and its computation does not require overpixel grids. This paper examines the impact on the identified strain field, the main quantity of interest for solid mechanics, of the metrics used to quantify the conservation of the optical flow and to impose the regularity of the displacement. The Charbonnier and Lorentzian loss functions are inspected in this work. A new regularization approach is used to locally vary the Tikhonov parameter using a mask in order to preserve the discontinuities and encourage the appearance of local phenomena while smoothing the computed fields elsewhere. Finally, an open-source GPU-accelerated python code has been implemented.

Mots clés

Strain Metrics Crack

Domaines

Mécanique des matériaux [physics.class-ph]

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Origine	Fichiers produits par l'(les) auteur(s)

Ahmed CHABIB : Connectez-vous pour contacter le contributeur

https://hal.science/hal-04251608

Soumis le : vendredi 20 octobre 2023-13:28:53

Dernière modification le : lundi 16 décembre 2024-17:54:10

Dates et versions

hal-04251608 , version 1 (20-10-2023)

Identifiants

HAL Id : hal-04251608 , version 1
DOI : 10.1111/str.12494

Citer

Ahmed Chabib, Jean-Francois Witz, Pierre Gosselet, Vincent Magnier. The impact of metrics in mechanical imaging. Strain, 2025, 61, pp.e1249. ⟨10.1111/str.12494⟩. ⟨hal-04251608⟩

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