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Добірка наукової літератури з теми "Microscopie ptychographique de Fourier"
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Статті в журналах з теми "Microscopie ptychographique de Fourier"
Marchand, Erich W. "Optique de Fourier en Microscopie Électronique (A. Lannes and J. Ph. Pérez)." SIAM Review 27, no. 4 (December 1985): 600–601. http://dx.doi.org/10.1137/1027170.
Повний текст джерелаДисертації з теми "Microscopie ptychographique de Fourier"
Hassini, Houda. "Automatic analysis of blood smears images : contribution of phase modality in Fourier Ptychographic Microscopy." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAS014.
Повний текст джерелаDigital pathology presents today a fundamental tool for medical diagnosis, exploiting technological advances in digitalization to transform biological samples into digital data, thus facilitating their visualization and analysis. However, these methods, often based on conventional microscopy, encounter limitations that sometimes hinder their effectiveness.From this perspective, unconventional imaging methods such as Fourier ptychographic microscopy offer promising prospects for overcoming these limitations. Indeed, FPM offers access to the phase in complement of the intensity and allows examining a large Field of View at a high resolution at a reasonable design cost.This thesis explores Fourier ptychographic microscopy (FPM) 's potential in thin blood smear analysis. Several results have been obtained thanks to a multidisciplinary approach integrating deep learning and microscopy.We have first focused our attention on the problem of limited complexity of parasite detection for malaria diagnosis. The joint exploitation of intensity and phase is shown to improve the performance of a deep network detector. To this end, a complex-valued CNN has been introduced in Faster-RCNN architecture for efficient feature extraction.Secondly, we have considered a more complex application, namely the classification of white blood cells, where the benefits of joint exploitation of intensity and phase were also confirmed. Furthermore, to reduce the imbalance of classes encountered in this task, we propose a novel physics-informed GAN model dedicated to generating intensity and phase images. This model avoids the mode collapse problem faced with usual GAN implementation.Finally, we have considered optimizing the FPM microscope design. To this end, we explore strategies combining simulations, neural networks, and image formation modeling. We demonstrate that FPM can use low resolutions without significantly compromising performance.This thesis underscores the interest in tailoring machine learning in connection to microscopy principles and highlights the potential of Fourier ptychographic microscopy for future automated diagnosis systems
Liu, Hui. "Microscopie tomographique diffractive et profilométrie multivue à haute résolution." Thesis, Mulhouse, 2014. http://www.theses.fr/2014MULH9558/document.
Повний текст джерелаWe have developed a tomographic diffractive microscope in reflection, which permits observation of sample surfaces with an improved lateral resolution, compared to a conventional holographic microscope. From the same set of data, high-precision measurements can be performed on the shape of the reflective surface by reconstructing the phase of the diffracted field. doing so allows for several advantages compared to classical holographic interferometric measurements: improvement in lateral resolution, easier phase unwrapping, reduction of the coherent noise, combined with the high-longitudinal precision provided by interferometric phase measurements. We demonstrate these capabilities by imaging various test samples
Zhang, Jinchi. "Microscopie acoustique large bande : modélisation des réponses échographiques et validation expérimentale." Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0059.
Повний текст джерелаThis work is mainly a fundamental contribution to the wide band acoustic microscopy, due to the important part devoted to the modeling of acoustic phenomena and to their validation. We have been interested in the study of the impulse choreographic responses produced by large aperture spherical transducers immersed in water, in front of various solid plane reflectors. Two models were developed in order to predict these responses, the first operates directly in the time domain and the second makes use of the harmonic synthesis. These two methods lead to identical results. The temporal approach consists in adding the elementary contributions of the transient Green functions for the reflected field. This calculation is complicated and time consuming and therefore we have chosen a more efficient method based on a preliminary study in the frequency domain. For that purposed we derived a new formulation of the well-known V(z) curves, characterised by an exact expression of the pupil function for spherical caps vibrating uniformly or not. By Fourier transforming these exact harmonic results, the impulse echographic response was deduced. In the case of a semi infinite reflector, an interesting analytical expression has been obtained. The numerical simulations are in perfect agreement with the experimental results obtained with a wideband concave transducer, whose piezoelectric element is a thin PVDF film. This proves that our hypothesis, on the uniformity of the vibration of the concave surface, is satisfactory. At last, two applications were presented, demonstrating the interest of this wideband approach
Tria, Assia. "Traitement spécifique de la signature acoustique et approche du problème inverse." Montpellier 2, 1994. http://www.theses.fr/1994MON20150.
Повний текст джерелаSrichan, Sirinart. "Synchrotron Based Fourier Transform Infrared Microspectroscopy and Fluorescence Microscopy : Application on Photodynamic Treated Cancer Cells." Paris 7, 2009. http://www.theses.fr/2009PA077181.
Повний текст джерелаIn this thesis, we studied the photodynamic effects of Hypocrellin A on four cancer cell lines using fluorescence microscopy, cytotoxicity tests and FT-IR microspectroscopy. As HA is a natural fluorescent substance, we used this intrinsic property to observe its localization in HeLa cells by fluorescence microscopy. The fluorescence images revealed that HA did not penetrated into the nucleus but localized in the cytoplasm and aggregated perinuclearly after 24 hours of incubation. MTT viability assay was performed to evaluate the optimum PDT conditions (HA and light dose) which induced cell death in the four cell lines HeLa, Calu-1, K562, K562 RSTI571. The dark toxicity of HA on ail cell lines is low, but is increasing dose-dependently. The phototoxicity of HA on all cell lines was increasing in both HA dose and light dose dependent manner. The light irradiation alone affected only negligibly the cell survival. HeLa cells are sensitive to HA PDT than Calu-1 cells. We found also that K562 and K562 RSTI are sensitive to HA. Moreover the synergetic effect of HA and Glivec® on K562 RSTI was observed. FT-IR microspectroscopy detected the changes in the secondary structure of proteins exhibiting an increase of beta sheets characteristics frequency affected by ROS generated from PDT. , with a predominant shoulder at around 1630 cm"1 (for the Amide I band) and 1530 cm"1 (for the Amide II band). Moreover, a slight decrease of the lipid intensity was noticed. Coupling fluorescence microscopy and FT-IR microscopy was carried out on the same instrument. Fluorescence microscopy could reveal the modes of cell death while FT-IR microspectroscopy showed effect of HA PDT on the secondary structure of proteins. All approaches carried out in this thesis revealed that even HA did not penetrate in the nucleus but there are changes in secondary structure of proteins in nucleus which can be observed by FT-IR spectromicroscopy
Verrier, Nicolas. "Microscopie holographique numérique : modélisation et développement de méthodes pour l'étude d'écoulements canalisés et microcanalisés." Phd thesis, Université de Rouen, 2009. http://tel.archives-ouvertes.fr/tel-00634672.
Повний текст джерелаMarim, Marcio. "L'Imagerie Compressé Appliqué a la Microscopie Biologique." Phd thesis, Telecom ParisTech, 2011. http://tel.archives-ouvertes.fr/tel-00586625.
Повний текст джерелаVerrier, Nicolas. "Microscopie holographique numérique : modélisation et développement de méthodes pour l'étude des écoulements canalisés et microcanalisés." Phd thesis, Rouen, 2009. http://www.theses.fr/2009ROUES051.
Повний текст джерелаMarim, Marcio. "Applications du Compressed Sensing à l'imagerie biologique de microscopie." Phd thesis, Télécom ParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00710395.
Повний текст джерелаLéger, Charles-Louis. "Etude expérimentale des solutions solides octaédriques ternaires dans les smectites." Poitiers, 1997. http://www.theses.fr/1997POIT2291.
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