Literatura científica selecionada sobre o tema "Problèmes inverses en imagerie"
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Artigos de revistas sobre o assunto "Problèmes inverses en imagerie"
Carlavan, Mikael, Pierre Weiss e Laure Blanc-féraud. "Régularité et parcimonie pour les problèmes inverses en imagerie. Algorithmes et comparaisons". Traitement du signal 27, n.º 2 (28 de abril de 2010): 189–219. http://dx.doi.org/10.3166/ts.27.189-219.
Texto completo da fonteDEMOMENT, G., e J. IDIER. "PROBLÈMES INVERSES ET DÉCONVOLUTION". Le Journal de Physique IV 02, n.º C1 (abril de 1992): C1–929—C1–936. http://dx.doi.org/10.1051/jp4:19921203.
Texto completo da fonteJobert, Georges. "Des problèmes inverses en physique". Reflets de la physique, n.º 31 (outubro de 2012): 12–16. http://dx.doi.org/10.1051/refdp/201231012.
Texto completo da fonteCouchon, S., D. Malinvaud, P. Bonfils e P. Halimi. "Exploration des papillomes inverses en imagerie". Journal de Radiologie 87, n.º 10 (outubro de 2006): 1349–50. http://dx.doi.org/10.1016/s0221-0363(06)87220-3.
Texto completo da fonteGarnero, L., J. Fonroget, F. Coutand e P. Bailly. "Problèmes inverses en tomographie d'émission – Nouvelles tendances". Annales de Physique 24, n.º 3 (1999): 155–95. http://dx.doi.org/10.1051/anphys:199903010.
Texto completo da fonteKluger, Nicolas. "Tatouages et imagerie médicale : problèmes et mythes". La Presse Médicale 43, n.º 5 (maio de 2014): 529–33. http://dx.doi.org/10.1016/j.lpm.2013.07.031.
Texto completo da fonteDemoment, G. "Problèmes inverses en traitement du signal et de l'image". Journal de Physique IV (Proceedings) 12, n.º 1 (março de 2002): 3–34. http://dx.doi.org/10.1051/jp42002001.
Texto completo da fontede Marsily, Ghislain, Jean-Pierre Delhomme, Frédéric Delay e Alvaro Buoro. "Regards sur 40 ans de problèmes inverses en hydrogéologie". Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 329, n.º 2 (julho de 1999): 73–87. http://dx.doi.org/10.1016/s1251-8050(99)80208-0.
Texto completo da fonteThibault, Fabienne, Martine Meunier e Olivier Ouhioun. "Imagerie mammaire, problèmes médico-légaux : étude de situations pratiques". Journal de Radiologie 87, n.º 10 (outubro de 2006): 1368. http://dx.doi.org/10.1016/s0221-0363(06)87277-x.
Texto completo da fonteBadran, F., e S. Thiria. "Les perceptrons multicouches : de la régression non-linéaire aux problèmes inverses". Journal de Physique IV (Proceedings) 12, n.º 1 (março de 2002): 157–88. http://dx.doi.org/10.1051/jp42002007.
Texto completo da fonteTeses / dissertações sobre o assunto "Problèmes inverses en imagerie"
Buhan, Maya de. "Problèmes inverses et simulations numériques en viscoélasticité 3D". Paris 6, 2010. http://www.theses.fr/2010PA066379.
Texto completo da fonteBaussard, Alexandre. "Résolution de problèmes inverses non linéaires : applications en imagerie à ondes électromagnétiques". Cachan, Ecole normale supérieure, 2002. http://www.theses.fr/2002DENSA010.
Texto completo da fonteDebarnot, Valentin. "Microscopie computationnelle". Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30156.
Texto completo da fonteThe contributions of this thesis are numerical and theoretical tools for the resolution of blind inverse problems in imaging. We first focus in the case where the observation operator is unknown (e.g. microscopy, astronomy, photography). A very popular approach consists in estimating this operator from an image containing point sources (microbeads or fluorescent proteins in microscopy, stars in astronomy). Such an observation provides a measure of the impulse response of the degradation operator at several points in the field of view. Processing this observation requires robust tools that can rapidly use the data. We propose a toolbox that estimates a degradation operator from an image containing point sources. The estimated operator has the property that at any location in the field of view, its impulse response is expressed as a linear combination of elementary estimated functions. This makes it possible to estimate spatially invariant (convolution) and variant (product-convolution expansion) operators. An important specificity of this toolbox is its high level of automation: only a small number of easily accessible parameters allows to cover a large majority of practical cases. The size of the point source (e.g. bead), the background and the noise are also taken in consideration in the estimation. This tool, coined PSF-estimator, comes in the form of a module for the Fiji software, and is based on a parallelized implementation in C++. The operators generated by an optical system are usually changing for each experiment, which ideally requires a calibration of the system before each acquisition. To overcome this, we propose to represent an optical system not by a single operator (e.g. convolution blur with a fixed kernel for different experiments), but by subspace of operators. This set allows to represent all the possible states of a microscope. We introduce a method for estimating such a subspace from a collection of low rank operators (such as those estimated by the toolbox PSF-Estimator). We show that under reasonable assumptions, this subspace is low-dimensional and consists of low rank elements. In a second step, we apply this process in microscopy on large fields of view and with spatially varying operators. This implementation is possible thanks to the use of additional methods to process real images (e.g. background, noise, discretization of the observation).The construction of an operator subspace is only one step in the resolution of blind inverse problems. It is then necessary to identify the degradation operator in this set from a single observed image. In this thesis, we provide a mathematical framework to this operator identification problem in the case where the original image is constituted of point sources. Theoretical conditions arise from this work, allowing a better understanding of the conditions under which this problem can be solved. We illustrate how this formal study allows the resolution of a blind deblurring problem on a microscopy example.[...]
Julliand, Thibault. "Automatic noise-based detection of splicing in digital images". Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC2057.
Texto completo da fonteIn this dissertation, we offer three new forensics imagery methods to detect splicing in digital images by exploiting image noise statistics. To do so, we introduce a new tool, the noise density histogram, and its derivative, the noise density contribution histogram. Our methods allow splicing detection on both raw and JPEG images. Although the use of noise discrepancies to detect splicing has already been done multiple times, most existing methods tend to perform poorly on the current generation of high quality images, with high resolution and low noise. The effectiveness of our approaches are demonstrated over a large set of such images, with randomly-generated splicings. We also present a detailed analysis of the evolution of the noise in a digital camera, and how it affects various existing forensics approaches. In a final part, we use the tool we developed in a counter-forensics approach, in order to hide the trace left by splicing on the image noise
Mugnier, Laurent. "Problèmes inverses en Haute Résolution Angulaire". Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00654835.
Texto completo da fonteDe, Buhan Maya. "Problèmes inverses et simulations numériques en viscoélasticité 3D". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00552111.
Texto completo da fonteGuadarrama, Lili. "Imagerie en régime temporel". Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00543301.
Texto completo da fonteCindea, Nicolae. "Problèmes inverses et contrôlabilité avec applications en élasticité et IRM". Phd thesis, Université Henri Poincaré - Nancy I, 2010. http://tel.archives-ouvertes.fr/tel-00750955.
Texto completo da fonteEl, Houari Karim. "Modélisation et imagerie électrocardiographiques". Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S063/document.
Texto completo da fonteThe estimation of solutions of the inverse problem of Electrocardiography (ECG) represents a major interest in the diagnosis and catheter-based therapy of cardiac arrhythmia. The latter consists in non-invasively providing 3D images of the spatial distribution of cardiac electrical activity based on anatomical and electrocardiographic data. On the one hand, this problem is challenging due to its ill-posed nature. On the other hand, validation of proposed methods on clinical data remains very limited. Another way to proceed is by evaluating these methods performance on data simulated by a cardiac electrical model. For this application, existing models are either too complex or do not produce realistic cardiac patterns. As a first step, we designed a low-resolution heart-torso model that generates realistic cardiac mappings and ECGs in healthy and pathological cases. This model is built upon a simplified heart torso geometry and implements the monodomain formalism by using the Finite Element Method (FEM). Parameters were identified using an evolutionary approach and their influence were analyzed by a screening method. In a second step, a new approach for solving the inverse problem was proposed and compared to classical methods in healthy and pathological cases. This method uses a spatio-temporal a priori on the cardiac electrical activity and the discrepancy principle for finding an adequate regularization parameter
Lazzaretti, Marta. "Algorithmes d'optimisation dans des espaces de Banach non standard pour problèmes inverses en imagerie". Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ4009.
Texto completo da fonteThis thesis focuses on the modelling, the theoretical analysis and the numerical implementation of advanced optimisation algorithms for imaging inverse problems (e.g,., image reconstruction in computed tomography, image deconvolution in microscopy imaging) in non-standard Banach spaces. It is divided into two parts: in the former, the setting of Lebesgue spaces with a variable exponent map L^{p(cdot)} is considered to improve adaptivity of the solution with respect to standard Hilbert reconstructions; in the latter a modelling in the space of Radon measures is used to avoid the biases observed in sparse regularisation methods due to discretisation.In more detail, the first part explores both smooth and non-smooth optimisation algorithms in reflexive L^{p(cdot)} spaces, which are Banach spaces endowed with the so-called Luxemburg norm. As a first result, we provide an expression of the duality maps in those spaces, which are an essential ingredient for the design of effective iterative algorithms.To overcome the non-separability of the underlying norm and the consequent heavy computation times, we then study the class of modular functionals which directly extend the (non-homogeneous) p-power of L^p-norms to the general L^{p(cdot)}. In terms of the modular functions, we formulate handy analogues of duality maps, which are amenable for both smooth and non-smooth optimisation algorithms due to their separability. We thus study modular-based gradient descent (both in deterministic and in a stochastic setting) and modular-based proximal gradient algorithms in L^{p(cdot)}, and prove their convergence in function values. The spatial flexibility of such spaces proves to be particularly advantageous in addressing sparsity, edge-preserving and heterogeneous signal/noise statistics, while remaining efficient and stable from an optimisation perspective. We numerically validate this extensively on 1D/2D exemplar inverse problems (deconvolution, mixed denoising, CT reconstruction). The second part of the thesis focuses on off-the-grid Poisson inverse problems formulated within the space of Radon measures. Our contribution consists in the modelling of a variational model which couples a Kullback-Leibler data term with the Total Variation regularisation of the desired measure (that is, a weighted sum of Diracs) together with a non-negativity constraint. A detailed study of the optimality conditions and of the corresponding dual problem is carried out and an improved version of the Sliding Franke-Wolfe algorithm is used for computing the numerical solution efficiently. To mitigate the dependence of the results on the choice of the regularisation parameter, an homotopy strategy is proposed for its automatic tuning, where, at each algorithmic iteration checks whether an informed stopping criterion defined in terms of the noise level is verified and update the regularisation parameter accordingly. Several numerical experiments are reported on both simulated 2D and real 3D fluorescence microscopy data
Livros sobre o assunto "Problèmes inverses en imagerie"
L, Bonilla Luis, Carpio A e Centro internazionale matematico estivo, eds. Inverse problems and imaging: Lectures given at the C.I.M.E. Summer School held in Martina Franca, Italy, September 15-21, 2002. Berlin: Springer, 2008.
Encontre o texto completo da fonteChoulli, Mourad. Une introduction aux problèmes inverses elliptiques et paraboliques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02460-3.
Texto completo da fonteChoulli, Mourad. Une introduction aux problèmes inverses elliptiques et paraboliques. Verlag: Springer, 2009.
Encontre o texto completo da fonteIsakov, Victor. Inverse problems for partial differential equations. 2a ed. New York: Springer, 2010.
Encontre o texto completo da fonteMario, Bertero, e Pike E. R. 1929-, eds. Inverse problems in scattering and imaging: Proceedings of a NATO Advanced Research Workshop held at Cape Cod, USA, 14-19 April 1991. Bristol: A. Hilger, 1992.
Encontre o texto completo da fonteT, Herman Gabor, e Sabatier Pierre Célestin 1935-, eds. Basic methods of tomography and inverse problems: A set of lectures. Bristol: A. Hilger, 1987.
Encontre o texto completo da fonteBertero, Mario. Introduction to inverse problems in imaging. Bristol, UK: Institute of Physics Pub., 1998.
Encontre o texto completo da fonteBeaulieu, Danie. Techniques d'Impact pour grandir: Illustrations pour développer l'intelligence émotionnelle chez les adultes. 3a ed. Le Gardeur, Québec: Impact!, 2006.
Encontre o texto completo da fonteTechniques d'Impact pour grandir: Illustrations pour développer l'intelligence émotionnelle chez les enfants. 4a ed. Le Gardeur, Québec: Impact!, 2006.
Encontre o texto completo da fonteTechniques d'Impact pour grandir: Illustrations pour développer l'intelligence émotionnelle chez les enfants. Lac Beauport, Québec: Éditions Académie impact, 2000.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Problèmes inverses en imagerie"
Choulli, Mourad. "Problèmes inverses elliptiques". In Mathématiques et Applications, 35–157. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02460-3_2.
Texto completo da fonteChoulli, Mourad. "Problèmes inverses paraboliques". In Mathématiques et Applications, 160–237. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02460-3_3.
Texto completo da fonteSOULEZ, Ferréol, e Éric THIÉBAUT. "Les problèmes inverses pour la reconstruction d’image en holographie". In Imageries optiques non conventionnelles pour la biologie, 71–102. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9132.ch3.
Texto completo da fonteDUPUTEL, Zacharie. "Phase co-sismique : imagerie de la rupture sismique". In Le cycle sismique, 77–118. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9038.ch2.
Texto completo da fonteMOMEY, Fabien, Thomas OLIVIER e Corinne FOURNIER. "Reconstruction d’échantillons en microscopie holographique numérique en ligne". In Imageries optiques non conventionnelles pour la biologie, 103–41. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9132.ch4.
Texto completo da fonte"7 Problèmes inverses". In Mathématiques pour l’imagerie médicale, 99–106. EDP Sciences, 2021. http://dx.doi.org/10.1051/978-2-7598-2496-0.c008.
Texto completo da fonte