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Modélisation stochastique pour l'analyse d'images texturées : Approches Bayésiennes pour la caractérisation dans le domaine des transformées

Nour-Eddine Lasmar 1
1 Groupe Signal et Image
IMS - Laboratoire de l'intégration, du matériau au système
Abstract : In this thesis we study the statistical modeling of textured images using multi-scale and multi-orientation representations. Based on the results of studies in neuroscience assimilating the human perception mechanism to a selective spatial frequency scheme, we propose to characterize textures by probabilistic models of subband coefficients.Our contributions in this context consist firstly in the proposition of probabilistic models taking into account the leptokurtic nature and the asymmetry of the marginal distributions associated with a textured content. First, to model analytically the marginal statistics of subbands, we introduce the asymmetric generalized Gaussian model. Second, we propose two families of multivariate models to take into account the dependencies between subbands coefficients. The first family includes the spherically invariant processes that we characterize using Weibull distribution. The second family is this of copula based multivariate models. After determination of the copula characterizing the dependence structure adapted to the texture, we propose a multivariate extension of the asymmetric generalized Gaussian distribution using Gaussian copula. All proposed models are compared quantitatively using both univariate and multivariate statistical goodness of fit tests. Finally, the last part of our study concerns the experimental validation of the performance of proposed models through texture based image retrieval. To do this, we derive closed-form metrics measuring the similarity between probabilistic models introduced, which we believe is the third contribution of this work. A comparative study is conducted to compare the proposed probabilistic models to those of the state-of-the-art.
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Submitted on : Monday, April 8, 2013 - 5:56:41 PM
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  • HAL Id : tel-00809279, version 1


Nour-Eddine Lasmar. Modélisation stochastique pour l'analyse d'images texturées : Approches Bayésiennes pour la caractérisation dans le domaine des transformées. Traitement des images [eess.IV]. Université Sciences et Technologies - Bordeaux I, 2012. Français. ⟨tel-00809279⟩



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