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Techniques variationnelles et calcul parallèle en imagerie : Estimation du flot optique avec luminosité variable en petits et larges déplacements

Abstract : The work presented in this thesis focuses on the estimation of the optical flow through variational methods in small and large displacements. We propose a model based on the combined local-global strategy to which we add the consideration of brightness intensity variations. The particularity of this manuscript is the use of the finite element method to solve the equations. Indeed, for now, this method is really rare in the field of the optical flow. Thanks to this choice of resolution, we implement an adaptive control of the regularization and a mesh adaptation to refine the solution on the edges of the image. To reduce computation times, we parallelize the programs. The first method implemented is a parallel in time method called parareal. By combining a coarse and a fine solver, this algorithm speeds up the computations. To save even more time and to also be able to handle high resolution sequences, we then use a domain decomposition method. Combined with the massively parallel solver MUMPS, this method allows a significant reduction of computation times. Finally, we propose to couple the domain decomposition method and the parareal to have the benefits of both methods. In the second part, we apply all these models to the case of the optical flow estimation in large displacements. We use the parareal method to cope with the non-linearity of the problem. We end by a concrete example of application of the optical flow in film restoration.
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https://tel.archives-ouvertes.fr/tel-01661415
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Submitted on : Monday, December 11, 2017 - 11:33:01 PM
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  • HAL Id : tel-01661415, version 1

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Diane Gilliocq-Hirtz. Techniques variationnelles et calcul parallèle en imagerie : Estimation du flot optique avec luminosité variable en petits et larges déplacements. Autre. Université de Haute Alsace - Mulhouse, 2016. Français. ⟨NNT : 2016MULH8379⟩. ⟨tel-01661415⟩

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