Academic literature on the topic 'Méthodes de déconvolution'
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Journal articles on the topic "Méthodes de déconvolution":
Dechemi, N., and H. Chambaz. "La prévision des crues du bassin versant de l'Oued Dis (Sebaou) par la métode DPFT." Revue des sciences de l'eau 7, no. 4 (April 12, 2005): 331–42. http://dx.doi.org/10.7202/705204ar.
Maulin, Maëva, Nicolas Estre, David Tisseur, Grégoire Kessedjian, Alix Sardet, Emmanuel Payan, and Daniel Eck. "Défloutage de projections tomographiques industrielles hautes énergies à l’aide d’un réseau de neurones convolutifs." e-journal of nondestructive testing 28, no. 9 (September 2023). http://dx.doi.org/10.58286/28481.
Dissertations / Theses on the topic "Méthodes de déconvolution":
Guerchaoui, Atman. "Etude comparative des principales méthodes de déconvolution en prospection sismique." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0041.
Nguyễn, Hoài Nam. "Méthodes et algorithmes de segmentation et déconvolution d'images pour l'analyse quantitative de Tissue Microarrays." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S104/document.
This thesis aims at developing dedicated methods for quantitative analysis of Tissue Microarray (TMA) images acquired by fluorescence scanners. We addressed there issues in biomedical image processing, including segmentation of objects of interest (i.e. tissue samples), correction of acquisition artifacts during scanning process and improvement of acquired image resolution while taking into account imaging modality and scanner design. The developed algorithms allow to envisage a novel automated platform for TMA analysis, which is highly required in cancer research nowadays. On a TMA slide, multiple tissue samples which are collected from different donors are assembled according to a grid structure to facilitate their identification. In order to establish the link between each sample and its corresponding clinical data, we are not only interested in the localization of these samples but also in the computation of their array (row and column) coordinates according to the design grid because the latter is often very deformed during the manufacturing of TMA slides. However, instead of directly computing array coordinates as existing approach, we proposed to reformulate this problem as the approximation of the deformation of the theoretical TMA grid using “thin plate splines” given the result of tissue sample localization. We combined a wavelet-based detection and a ellipse-based segmentation to eliminate false alarms and thus improving the localization result of tissue samples. According to the scanner design, images are acquired pixel by pixel along each line, with a change of scan direction between two subsequent lines. Such scanning system often suffers from pixel mis-positioning (jitter) due to imperfect synchronization of mechanical and electronic components. To correct these scanning artifacts, we proposed a variational method based on the estimation of pixel displacements on subsequent lines. This method, inspired from optical flow methods, consists in estimating a dense displacement field by minimizing an energy function composed of a nonconvex data fidelity term and a convex regularization term. We used half-quadratic splitting technique to decouple the original problem into two small sub-problems: one is convex and can be solved by standard optimization algorithm, the other is non-convex but can be solved by a complete search. To improve the resolution of acquired fluorescence images, we introduced a method of image deconvolution by considering a family of convex regularizers. The considered regularizers are generalized from the concept of Sparse Variation which combines the L1 norm and Total Variation (TV) to favors the co-localization of high-intensity pixels and high-magnitude gradient. The experiments showed that the proposed regularization approach produces competitive deconvolution results on fluorescence images, compared to those obtained with other approaches such as TV or the Schatten norm of Hessian matrix
Sintes, Christophe. "Déconvolution bathymétrique d'images sonar latéral par des méthodes interférométriques et de traitement de l'image." Rennes 1, 2002. http://www.theses.fr/2002REN10066.
Vivet, Laurent. "Amélioration de la résolution des méthodes d'échographie ultrasonore en contrôle non destructif par déconvolution adaptative." Paris 11, 1989. http://www.theses.fr/1989PA112256.
Thibon, Louis. "Méthodes d'augmentation de résolution en microscopie optique exploitant le modelage de faisceau laser et la déconvolution." Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/34695.
Laser scanning microscopy is limited in lateral resolution by the diffraction of light. Superresolution methods have been developed since the 90s to overcome this limitation. However, superresolution is generally achieved at the cost of a greater complexity (high power lasers, very long acquisition times, specic uorophores) and limitations on the observable samples. In some cases, such as Structured Illumination Microscopy (SIM) and Switching Laser Modes (SLAM), a more modest improvement in resolution is obtained with a reduced complexity and fewer limitations. We propose here methods which improve the resolution while minimizing the experimental constraints and keeping most of the advantages of classical microscopy. First, we show that we can improve by twenty percent the resolution of confocal microscopy by using Bessel-Gauss beams, and by having the right pinhole size (1 Airy Unit), compared to conventional Gaussian beam based confocal microscopy. The advantages of this strategy include simplicity of installation and use, linear polarization compatibility, possibility to combine it with other resolution enhancement and superresolution strategies. We demonstrate the resolution enhancement capabilities of Bessel-Gauss beams both theoretically and experimentally on nano-spheres and biological tissue samples with a resolution of 0.39. We achieved these resolutions without any residual artifacts coming from the Bessel-Gauss beam side lobes. We also show that the resolution enhancement of Bessel-Gauss beams leads to a better statistical colocalization analysis with fewer false positive results than when using Gaussian beams. We have also used Bessel-Gauss beams of different orders to further improve the resolution by combining them in SLAM microscopy achieving a resolution of 0.17 (90 nm with a wavelength of 532 nm). In a second step, we propose a method to improve the resolution of confocal microscopy by combining different laser modes and deconvolution. Two images of the same eld are acquired with the confocal microscope using different laser modes and are used as inputs to a deconvolution algorithm. The two laser modes have different Point Spread Functions and thus provide complementary information leading to an image with enhanced resolution compared to using a single confocal image as input to the same deconvolution algorithm. By changing the laser modes to Bessel-Gauss beams, we were able to improve the effciency of the deconvolution algorithm and to obtain images with a residual Point Spread Function having a width smaller than 100 nm. The proposed method requires only a few add-ons to the classic confocal or two photon microscopes. Finally, we propose a three dimensional tomography reconstruction method using Bessel-Gauss beams as projection tools in two-photon microscopy. While focussing Bessel-Gauss beams at an angle in two photon microscopy, we can obtain a series of projections that can be used for tomography reconstruction. The aim is to test the practicality of the methods allowing to reconstruct a volume while using fewer images than plane by plane acquisitions as in classic two-photon microscopy.
Cassereau, Didier. "Nouvelles méthodes et applications de la propagation transitoire dans les milieux fluides et solides." Paris 7, 1988. http://www.theses.fr/1988PA077224.
Luczak, Anaelle. "Méthodes sismiques pour la surveillance des grandes structures du génie civil." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4096/document.
While conventional seismic studies use energetic impulse sources, recent years have seen the emergence of analyses based on the use of ambient seismic noise. These analyses rely on inter-correlation or deconvolution operations, in order to reconstruct signals that can be considered as, under certain conditions, the Green functions of the medium between two recording stations. In this thesis are developed methods for the monitoring of sea dikes and geological storage massifs, either from listening to ambient noise when environmental conditions are favourable, or from the recording of signals emitted by a controlled vibratory source. Each of these two types of structures presents specific constraints in the implementation of field measurements and in the method of analysis of the data acquired. This work is aimed at showing the adequacy of the calculation methods according to the acquisition system put in place, the type of waves studied (body or surface waves, depending on the application) and the studied observable (either the propagation velocity or the attenuation). The variation of these parameters is presented on different time scales, in order to detect either fast and punctual phenomena induced by an external forcing, or long-term phenomena, such as the aging of the structure
Combe, Pascal. "Application des méthodes de déconvolution à la caractérisation ultrasonore de l'isolant de câbles électriques, et analyse temps-fréquence des réponses acoustiques." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0075.
Mena, Bernard. "Détection et analyse de sursauts gamma à l'aide du télescope SIGMA : caractérisation et calibrations de l'expérience, différentes méthodes de déconvolution des données." Toulouse 3, 1990. http://www.theses.fr/1990TOU30049.
Hassouna, Mohammad. "Développement et validation des méthodes spectroscopiques d'absorbance UV et de fluorescence appliquées à la caractérisation spatiotemporelle de la matière organique du sol extractible à l'eau (MOEE)." Aix-Marseille 1, 2006. http://theses.univ-amu.fr.lama.univ-amu.fr/2006AIX11042.pdf.
Books on the topic "Méthodes de déconvolution":
Centre canadien de la technologie des minéraux et de l'énergie. Nouvelle Méthode de Déconvolution Pour L'analyse des Spectres de Distribution de la Densité de Probabilité Obtenus Lors de Mesures D'interrogation Aux Rayons Gamma D'écoulements Multiphases. S.l: s.n, 1985.