JOINT RECONSTRUCTION IN IN-LINE HOLOGRAPHY COMBINING PARAMETRIC AND NON-PARAMETRIC INVERSE APPROACHES: APPLICATION TO FLUID MECHANICS - Archive ouverte HAL Access content directly
Conference Papers Year : 2018

JOINT RECONSTRUCTION IN IN-LINE HOLOGRAPHY COMBINING PARAMETRIC AND NON-PARAMETRIC INVERSE APPROACHES: APPLICATION TO FLUID MECHANICS

Anthony Berdeu
Olivier Flasseur
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Loïc Denis
Fabien Momey
Nathalie Grosjean
Corinne Fournier

Abstract

In-line digital holography is a simple and powerful tool to image absorbing and/or phase objects in numerous fields such as crystallography, biology or fluid mechanics. Nevertheless, this kind of interference imaging technique leads to a loss of the phase of the complex wave front on the sensor. This lack of phase information can be critical in the reconstruction process. Thus, the simplicity of the setup must be balanced by dedicated reconstruction algorithm to retrieve the object from its hologram, such as inverse approaches. In the case of simple objects for which an analytical model of propagation is known, parametric algorithms are very effective. But these approaches fail at reconstructing more complex objects, where non-parametric solutions must be involved. This may lead to a loss in precision or specificity. In this work we propose a new approach combining these two methods to take benefits from their own advantages. The object to reconstruction is split in two subparts. A part is described by a parametric model. The other part of the object is simulated via a non-parametric model. These two parts which interfere are jointly considered in the reconstruction algorithm by alternating parametric and non-parametric procedures. We apply this new technique to evaporating droplets where the high contrast fringes produced by the droplets tend to mask the fringes produced by the plume. With our method, both the droplet and the plume are jointly reconstructed.
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Dates and versions

hal-02140840 , version 1 (27-05-2019)

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  • HAL Id : hal-02140840 , version 1

Cite

Anthony Berdeu, Olivier Flasseur, Loïc Denis, Fabien Momey, Méès Loïc, et al.. JOINT RECONSTRUCTION IN IN-LINE HOLOGRAPHY COMBINING PARAMETRIC AND NON-PARAMETRIC INVERSE APPROACHES: APPLICATION TO FLUID MECHANICS. Holophi5 : 5ème rencontre francophone d'holographie numérique appliquée à la métrologie des fluides, Nov 2018, Montpellier, France. ⟨hal-02140840⟩
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