Influence of the sampling density on the noise level in displacement and strain maps obtained by processing periodic patterns - INRIA - Institut National de Recherche en Informatique et en Automatique Accéder directement au contenu
Article Dans Une Revue Measurement - Journal of the International Measurement Confederation (IMEKO) Année : 2021

Influence of the sampling density on the noise level in displacement and strain maps obtained by processing periodic patterns

Michel Grédiac
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Benoît Blaysat

Résumé

The aim of this study is to investigate the influence of the sampling density of periodic patterns such as checkerboards or 2D grids on the noise level observed in displacement and strain maps extracted from such images. A spectral method named Localized Spectrum Analysis (LSA) is used to process the images. It is shown that this parameter influences this noise level. This influence is quantified, and a power law is proposed to model it, with a value of the power identified with the measurements. It is also confirmed that checkerboards give a lower noise level than 2D grids, with an improvement which is also quantified, and which increases as the sampling density increases.
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Dates et versions

hal-02965328 , version 1 (07-04-2021)

Identifiants

Citer

Siyi Qin, Michel Grédiac, Benoît Blaysat, Shaopeng Ma, Frédéric Sur. Influence of the sampling density on the noise level in displacement and strain maps obtained by processing periodic patterns. Measurement - Journal of the International Measurement Confederation (IMEKO), 2021, 173, pp.108570. ⟨10.1016/j.measurement.2020.108570⟩. ⟨hal-02965328⟩
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