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Imagerie Acoustique Par Approximations Parcimonieuses Des Sources
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Book Synopsis Imagerie acoustique par approximations parcimonieuses des sources by : Antoine Peillot
Download or read book Imagerie acoustique par approximations parcimonieuses des sources written by Antoine Peillot and published by . This book was released on 2012 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: La description parcimonieuse des sources permet une approche nouvelle de l'analyse des champs acoustiques. Dans ce projet, nous avons appliqué ce principe à plusieurs scénarios: l'holographie acoustique de champ proche (NAH), la localisation et l'identification de directivité de sources. Ces méthodes d'imagerie exigent la résolution de problèmes inverses, souvent mal posés, qui nécessitent d'être régularisés. De plus, pour capter l'information utile et assurer de bonnes performances de reconstruction, les techniques traditionnelles d'antennerie imposent le déploiement d'un grand nombre de microphones. Dans ces travaux, nous utilisons l'approximation parcimonieuse des sources comme moyen de régularisation de problèmes d'imagerie. Cette méthode permet en outre de tirer profit du "compressive sampling" (CS), qui permet de diminuer le nombre de mesures utiles à la reconstruction des sources. On montre que l'application du CS à la NAH permet non seulement de mieux régulariser le problème par rapport aux techniques classiques, mais également de diminuer fortement le nombre de microphones en sous-échantillonnant l'hologramme au-delà de la limite imposée par la théorie de Shannon. Le problème de localisation parcimonieuse de sources permet la localisation avec une haute résolution de sources corrélées, en champ proche comme en champ lointain. Nous structurons la base de parcimonie en l'enrichissant avec un modèle de décomposition des sources en harmoniques sphériques pour localiser et identifier la directivité de sources complexes. Ces études ont nécessité le développement de techniques rapides de calibration de grands réseaux de microphones
Book Synopsis Approximations parcimonieuses et problèmes inverses en acoustique by : Gilles Chardon
Download or read book Approximations parcimonieuses et problèmes inverses en acoustique written by Gilles Chardon and published by . This book was released on 2012 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse présente d'une part, la construction d'approximations parcimonieuses de champs acoustiques, d'autre part l'utilisation de ces approximations pour la résolution de problèmes inverses. L'approximation de solutions de l'équation d'Helmholtz est étendue à des modèles de vibration de plaques, ce qui, entre autres, permet également de concevoir une méthode de calcul de mode propres alternative aux méthodes de référence. Différents problèmes inverses sont ensuite étudiés, en se basant sur ces résultats d'approximation. Le premier est l'holographie acoustique en champ proche, pour laquelle nous développons une nouvelle méthode de régularisation, ainsi qu'une antenne aléatoire permettant de réduire le nombre de mesures nécessaires à la reconstruction de déformées opérationnelles de plaques. Le deuxième problème inverse étudié est l'interpolation spatiale de réponses impulsionnelles de plaques, où nous montrons qu'en mesurant le champ vibratoire sur un ensemble d'échantillons bien choisi (justifié par une analyse théorique), les réponses impulsionnelles d'une plaque peuvent être obtenues avec moins de mesures que demandées par le théorème d'échantillonnage de Shannon. Enfin, le problème de la localisation de sources dans un espace clos réverbérant est étudié. Nous montrons qu'en utilisant des modèles parcimonieux d'ondes, la localisation est possible sans connaissances a priori sur les conditions aux limites du domaine de propagation des ondes.
Book Synopsis Medical Image Computing and Computer-Assisted Intervention -- MICCAI 2012 by : Nicholas Ayache
Download or read book Medical Image Computing and Computer-Assisted Intervention -- MICCAI 2012 written by Nicholas Ayache and published by Springer. This book was released on 2012-08-28 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three-volume set LNCS 7510, 7511, and 7512 constitutes the refereed proceedings of the 15th International Conference on Medical Image Computing and Computer-Assisted Intervention, MICCAI 2012, held in Nice, France, in October 2012. Based on rigorous peer reviews, the program committee carefully selected 252 revised papers from 781 submissions for presentation in three volumes. The third volume includes 79 papers organized in topical sections on diffusion imaging: from acquisition to tractography; image acquisition, segmentation and recognition; image registration; neuroimage analysis; analysis of microscopic and optical images; image segmentation; diffusion weighted imaging; computer-aided diagnosis and planning; and microscopic image analysis.
Book Synopsis Information Theory and Esthetic Perception by : Abraham A. Moles
Download or read book Information Theory and Esthetic Perception written by Abraham A. Moles and published by . This book was released on 1968 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Medical image computing and computer assisted intervention by : Nicholas Ayache
Download or read book Medical image computing and computer assisted intervention written by Nicholas Ayache and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bayesian Approach to Inverse Problems by : Jérôme Idier
Download or read book Bayesian Approach to Inverse Problems written by Jérôme Idier and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many scientific, medical or engineering problems raise the issue of recovering some physical quantities from indirect measurements; for instance, detecting or quantifying flaws or cracks within a material from acoustic or electromagnetic measurements at its surface is an essential problem of non-destructive evaluation. The concept of inverse problems precisely originates from the idea of inverting the laws of physics to recover a quantity of interest from measurable data. Unfortunately, most inverse problems are ill-posed, which means that precise and stable solutions are not easy to devise. Regularization is the key concept to solve inverse problems. The goal of this book is to deal with inverse problems and regularized solutions using the Bayesian statistical tools, with a particular view to signal and image estimation. The first three chapters bring the theoretical notions that make it possible to cast inverse problems within a mathematical framework. The next three chapters address the fundamental inverse problem of deconvolution in a comprehensive manner. Chapters 7 and 8 deal with advanced statistical questions linked to image estimation. In the last five chapters, the main tools introduced in the previous chapters are put into a practical context in important applicative areas, such as astronomy or medical imaging.
Book Synopsis Streaming Media Architectures, Techniques, and Applications: Recent Advances by : Zhu, Ce
Download or read book Streaming Media Architectures, Techniques, and Applications: Recent Advances written by Zhu, Ce and published by IGI Global. This book was released on 2010-09-30 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book spans a number of interdependent and emerging topics in streaming media, offering a comprehensive collection of topics including media coding, wireless/mobile video, P2P media streaming, and applications of streaming media"--Provided by publisher.
Book Synopsis Inverse Problems by : Charles W. Groetsch
Download or read book Inverse Problems written by Charles W. Groetsch and published by American Mathematical Soc.. This book was released on 1999-12-31 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problem solving in mathematics is often thought of as a one way process. For example: take two numbers and multiply them together. However for each problem there is also an inverse problem which runs in the opposite direction: now take a number and find a pair of factors. Such problems are considerably more important, in mathematics and throughout science, than they might first appear. This book concentrates on these inverse problems and how they can be usefully introduced to undergraduate students. A historical introduction sets the scene and gives a cultural context for the rest of the book. Chapters dealing with inverse problems in calculus, differential equations and linear algebra then follow and the book concludes with suggestions for further reading. Whatever their own field of expertise, this will be an essential purchase for anyone interested in the teaching of mathematics.
Book Synopsis Signal Processing by : Charles L. Byrne
Download or read book Signal Processing written by Charles L. Byrne and published by CRC Press. This book was released on 2014-11-12 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signal Processing: A Mathematical Approach is designed to show how many of the mathematical tools the reader knows can be used to understand and employ signal processing techniques in an applied environment. Assuming an advanced undergraduate- or graduate-level understanding of mathematics—including familiarity with Fourier series, matrices, probability, and statistics—this Second Edition: Contains new chapters on convolution and the vector DFT, plane-wave propagation, and the BLUE and Kalman filters Expands the material on Fourier analysis to three new chapters to provide additional background information Presents real-world examples of applications that demonstrate how mathematics is used in remote sensing Featuring problems for use in the classroom or practice, Signal Processing: A Mathematical Approach, Second Edition covers topics such as Fourier series and transforms in one and several variables; applications to acoustic and electro-magnetic propagation models, transmission and emission tomography, and image reconstruction; sampling and the limited data problem; matrix methods, singular value decomposition, and data compression; optimization techniques in signal and image reconstruction from projections; autocorrelations and power spectra; high-resolution methods; detection and optimal filtering; and eigenvector-based methods for array processing and statistical filtering, time-frequency analysis, and wavelets.
Book Synopsis Governance, Regulation and Powers on the Internet by : Eric Brousseau
Download or read book Governance, Regulation and Powers on the Internet written by Eric Brousseau and published by Cambridge University Press. This book was released on 2012-04-23 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interdisciplinary survey of the issues surrounding the governance of the Internet.
Book Synopsis Functional Imaging and Modeling of the Heart by :
Download or read book Functional Imaging and Modeling of the Heart written by and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This book constitutes the refereed proceedings of the 5th International Conference on Functional Imaging and Modeling of the Heart, FIMH 2009, held in Nice, France, in June 2009. The 54 revised full papers presented were carefully reviewed and selected from numerous submissions. The contributions cover topics such as cardiac imaging and electrophysiology, cardiac architecture imaging and analysis, cardiac imaging, cardiac electrophysiology, cardiac motion estimation, cardiac mechanics, cardiac image analysis, cardiac biophysical simulation, cardiac research platforms, and cardiac anatomical and functional imaging.
Book Synopsis Applied Signal Processing by : Thierry Dutoit
Download or read book Applied Signal Processing written by Thierry Dutoit and published by Springer Science & Business Media. This book was released on 2010-06-10 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Signal Processing: A MATLAB-Based Proof of Concept benefits readers by including the teaching background of experts in various applied signal processing fields and presenting them in a project-oriented framework. Unlike many other MATLAB-based textbooks which only use MATLAB to illustrate theoretical aspects, this book provides fully commented MATLAB code for working proofs-of-concept. The MATLAB code provided on the accompanying online files is the very heart of the material. In addition each chapter offers a functional introduction to the theory required to understand the code as well as a formatted presentation of the contents and outputs of the MATLAB code. Each chapter exposes how digital signal processing is applied for solving a real engineering problem used in a consumer product. The chapters are organized with a description of the problem in its applicative context and a functional review of the theory related to its solution appearing first. Equations are only used for a precise description of the problem and its final solutions. Then a step-by-step MATLAB-based proof of concept, with full code, graphs, and comments follows. The solutions are simple enough for readers with general signal processing background to understand and they use state-of-the-art signal processing principles. Applied Signal Processing: A MATLAB-Based Proof of Concept is an ideal companion for most signal processing course books. It can be used for preparing student labs and projects.
Book Synopsis Image Recovery: Theory and Application by : Henry Stark
Download or read book Image Recovery: Theory and Application written by Henry Stark and published by Elsevier. This book was released on 2013-04-25 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Image Recovery: Theory and Application focuses on signal recovery and synthesis problems. This book discusses the concepts of image recovery, including regularization, the projection theorem, and the pseudoinverse operator. Comprised of 13 chapters, this volume begins with a review of the basic properties of linear vector spaces and associated operators, followed by a discussion on the Gerchberg-Papoulis algorithm. It then explores image restoration and the basic mathematical theory in image restoration problems. The reader is also introduced to the problem of obtaining artifact-free computed tomographic reconstruction. Other chapters consider the importance of Bayesian approach in the context of medical imaging. In addition, the book discusses the linear programming method, which is particularly important for images with large number of pixels with zero value. Such images are usually found in medical imaging, microscopy, electron microscopy, and astronomy. This book can be a valuable resource to materials scientists, engineers, computed tomography technologists, and astronomers.
Book Synopsis Green Networking by : Francine Krief
Download or read book Green Networking written by Francine Krief and published by John Wiley & Sons. This book was released on 2012-12-13 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on green networking, which is an important topic for the scientific community composed of engineers, academics, researchers and industrialists working in the networking field. Reducing the environmental impact of the communications infrastructure has become essential with the ever increasing cost of energy and the need for reducing global CO2 emissions to protect our environment. Recent advances and future directions in green networking are presented in this book, including energy efficient networks (wired networks, wireless networks, mobile networks), adaptive networks (cognitive radio networks, green autonomic networking), green terminals, and industrial research into green networking (smart city, etc.).
Book Synopsis Multimodal Corpora by : Michael Kipp
Download or read book Multimodal Corpora written by Michael Kipp and published by Springer Science & Business Media. This book was released on 2009-09-23 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the International Workshop on "Multimodal Corpora: From Models of Natural Interaction to Systems and Applications", this expanded collection presents a comprehensive review of the current research in the field.
Book Synopsis Multimodal User Interfaces by : Dimitros Tzovaras
Download or read book Multimodal User Interfaces written by Dimitros Tzovaras and published by Springer Science & Business Media. This book was released on 2008-02-27 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: tionship indicates how multimodal medical image processing can be unified to a large extent, e. g. multi-channel segmentation and image registration, and extend information theoretic registration to other features than image intensities. The framework is not at all restricted to medical images though and this is illustrated by applying it to multimedia sequences as well. In Chapter 4, the main results from the developments in plastic UIs and mul- modal UIs are brought together using a theoretic and conceptual perspective as a unifying approach. It is aimed at defining models useful to support UI plasticity by relying on multimodality, at introducing and discussing basic principles that can drive the development of such UIs, and at describing some techniques as proof-of-concept of the aforementioned models and principles. In Chapter 4, the authors introduce running examples that serve as illustration throughout the d- cussion of the use of multimodality to support plasticity.
Book Synopsis Coherent Optical Processing by : Henry J. Caulfield
Download or read book Coherent Optical Processing written by Henry J. Caulfield and published by . This book was released on 1975 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
