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Estimation of motion using a PIV correlation-based method and an "optical-flow" one for two experimental flows: quantitative and qulitative comparison

Thomas Corpetti 1 Dominique Heitz 1 G. Arroyo 1 Etienne Mémin 2 A. Santa Cruz 1
2 VISTA - Vision spatio-temporelle et active
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
Abstract : Families of "Optical Flow" methods are frequently used in the Computer Vision community to estimate the velocity from a pair of images, because of their ability to estimate a reliable and dense (i.e. one vector per pixel) motion field. Even if many extensions of usual PIV correlation-based methods are able to obtain more and more information associated to a "sub pixel" precision, let us remark that it is always difficult to estimate correctly the motion when some particular event appears such as a loss of pairing in the interrogation area, an image truncation due to its finite size, a velocity gradient in the interrogation window, ... Furthermore, only the "most probable" displacement is extracted. From this point of view, the idea of using a motion estimation technique based on optical-flow for fluid images is appealing. In this paper, a qualitative and quantitative study is done to compare motion fields obtained from an usual PIV method and with a particular optical-flow method, dedicated to fluid motion. A mixing layer and the near wake of a circular cylinder are analyzed and significant parameters are extracted for both methods. Statistical results are compared with hot-wire anemometry measurements.
Mots-clés : FLOW OPTIQUE
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Conference papers
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https://hal.inrae.fr/hal-02583809
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Submitted on : Thursday, May 14, 2020 - 10:40:47 PM
Last modification on : Thursday, April 8, 2021 - 10:02:05 AM

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  • HAL Id : hal-02583809, version 1
  • IRSTEA : PUB00015747

Citation

Thomas Corpetti, Dominique Heitz, G. Arroyo, Etienne Mémin, A. Santa Cruz. Estimation of motion using a PIV correlation-based method and an "optical-flow" one for two experimental flows: quantitative and qulitative comparison. 12th International symposium Applications of laser techniques to fluid mechanics,Lisbon, PRT, 13-15 July 2004, 2004, Lisbonne, Portugal. pp.14. ⟨hal-02583809⟩

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