Fluid experimental flow estimation based on an optical-flow scheme |
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Authors: | T Corpetti D Heitz G Arroyo E Mémin A Santa-Cruz |
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Institution: | (1) avenue de Cucillé, Cemagref 17, 35044 Rennes Cedex, France;(2) IRISA/INRIA Campus, Universitaire de Beaulieu, 35042 Rennes Cedex, France;(3) Present address: Laboratoire COSTEL UMR 6554 LETG, Maison de la Recherche, Place du Recteur Henri Le Moal, 35043 Rennes Cedex, France |
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Abstract: | We present in this paper a novel approach dedicated to the measurement of velocity in fluid experimental flows through image
sequences. Unlike most of the methods based on particle image velocimetry (PIV) approaches used in that context, the proposed
technique is an extension of “optical-flow” schemes used in the computer vision community, which includes a specific enhancement
for fluid mechanics applications. The method we propose enables to provide accurate dense motion fields. It includes an image based integrated version of the continuity equation. This model is associated to a regularization
functional, which preserve divergence and vorticity blobs of the motion field. The method was applied on synthetic images
and on real experiments carried out to allow a thorough comparison with a state-of-the-art PIV method in conditions of strong
local free shear. |
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Keywords: | Fluid motion measurement Continuity equation Div– curl regularization Optical-flow PIV |
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