Développement des algorithmes pour le traitement des images de franges pour la reconstruction tomographique du champ de température dans un milieu axisymétrique

Abstract : The tomography of temperature fields is the cornerstone of every thermal metrology. Being an area of large scale activity, it requires a new control tools that are more powerful and efficient with a low cost. The use of holographic interferometry and moiré deflectometry have simplified to the maximum the needed equipments and transmitted the task to the smart and accurate image processing algorithms offered by these techniques. The main objective of this thesis is to develop chaining algorithms that allow the tomographic reconstruction of the temperature field of a transparent axis-symmetric medium. The realized work consists on providing at least three classes of algorithms which lead to the necessary information for the temperature field tomography. The first class includes the phase demodulation algorithms. The second represents the unwrapping phase algorithms. The last and the third class gather the algorithms used for solving the inverse Abel transform. To contribute to the problem solving, a phase demodulation by wavelet transform implementation has been performed. In this way, we have examined four versions of implementation of the wavelet transform, developed and compared three algorithms of estimation of the wavelet ridge. Concerning the unwrapping process, we have dissected four algorithms to surround and overcome some of the inherent problems involved in the unwrapping phase operation. In the same context, we have highlighted the resolution of the Abel inverse transform for which we have tested four algorithms for the moiré deflectometry and three algorithms for the holographic interferometry. The performance of all of these algorithms has been tested in both simulated images and profiles, as well as in real images and profiles. The obtained results reveal the weakness of some of these algorithms and attest the insured and fast convergence for others. We have also examined their ability to overcome some of the critical and inherent problems to the tomography of axis-symmetric mediums. To give practical and applied aspects to this work, we have conducted an experimental research using the holographic interferometry technique. Interferograms have been the subject of processing algorithms studied and found to be adequate for reconstruction of axisymmetric field temperature
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Efagrich Mahfoud. Développement des algorithmes pour le traitement des images de franges pour la reconstruction tomographique du champ de température dans un milieu axisymétrique. Informatique [cs]. FSTG - Marrakech, 2014. Français. ⟨tel-02163058⟩



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