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Towards an image quality criterion to optimize Digital image correlation. Use of an analytical model to optimize acquisition conditions

Article dans une revue avec comité de lecture
Author
GOULMY, J.P.
211915 Mechanics surfaces and materials processing [MSMP]
JÉGOU, S.
211915 Mechanics surfaces and materials processing [MSMP]
BARRALLIER, L.
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/21476
Date
2022
Journal
Optics & Laser Technology

Abstract

Digital image correlation (DIC) is expanding in many fields. In particular, it requires that the acquisition conditions and speckle be adapted to each application. A new methodology allowing to define the quality of the images in a fast and precise way is proposed. An analytical model based on mean intensity gradient of speckle pattern criterion and the standard deviation of displacement on images has been proposed. The model can be used on the whole image or by creating subsets in the image. Standard deviation maps of displacement are obtained. The methodology makes it possible to save a considerable amount of time compared to the full DIC calculation to optimize the image acquisition conditions, the speckle and the DIC parameters.

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