Download or read book Segmentation pyramidale de textures par d composition en ondelettes written by Georges L.. Loum and published by . This book was released on 1996 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PRESENTE UNE METHODE DE SEGMENTATION PYRAMIDALE D'IMAGES D'ASPECT TEXTURE PAR DECOMPOSITION EN ONDELETTES. D'UNE FACON GENERALE, TOUT PROCESSUS DE SEGMENTATION DE TEXTURES COMPORTE UNE ETAPE DE CARACTERISATION QUI PRECEDE L'ETAPE DE SEGMENTATION PROPREMENT DITE. NOTRE METHODE DE CARACTERISATION DE TEXTURES EST FONDEE SUR L'INTERPRETATION DES COEFFICIENTS DE DETAILS DE LA DECOMPOSITION EN ONDELETTES, COMME DECRIVANT LES VARIATIONS LOCALES DES NIVEAUX DE GRIS DE LA TEXTURE AUTOUR DE LEUR VALEUR MOYENNE. CETTE INTERPRETATION CONDUIT A LA DEFINITION D'UN NOUVEL ATTRIBUT, LE FACTEUR DE FORME, QUI SE CALCULE SUR UN NOUVEAU TYPE DE VOISINAGE QUI POSSEDE UNE STRUCTURE PYRAMIDALE. POUR EPROUVER LA PERTINENCE DE CE NOUVEL ATTRIBUT, DEUX ALGORITHMES DE CLASSIFICATION SUPERVISEE DE TEXTURES SONT PROPOSES. LE PREMIER EXPLOITE LA REPRESENTATION MULTIRESOLUTION DE L'ANALYSE PAR ONDELETTES POUR REALISER UNE CARACTERISATION EFFICACE DES TEXTURES A PLUSIEURS NIVEAUX DE RESOLUTION. LE SECOND DETERMINE POUR CHAQUE TEXTURE, UN NIVEAU MAXIMAL DE LA DECOMPOSITION EN ONDELETTES, EN DEFINISSANT UN SEUIL SUR LES VARIANCES DES IMAGES D'APPROXIMATION. CE NIVEAU EST UTILISE POUR REALISER UNE PRECLASSIFICATION, AVANT QUE LE PROCESSUS DE CLASSIFICATION NE SOIT CONDUIT A SON TERME DANS CHAQUE CLASSE CONSTITUEE. LES RESULTATS SATISFAISANTS OBTENUS PAR CES DEUX ALGORITHMES ONT VALIDE LA METHODE DE CARACTERISATION PROPOSEE ET DEMONTRE LA PERTINENCE DE L'ATTRIBUT FACTEUR DE FORME. LA METHODE DE SEGMENTATION PRESENTEE, TIRE PROFIT DE LA FORME PYRAMIDALE DU VOISINAGE SUR LEQUEL LE FACTEUR DE FORME EST CALCULE. CETTE FORME CONSTITUE UN VERITABLE ATOUT POUR UN PROCESSUS DE SEGMENTATION QUI SE FONDE SUR UNE REPRESENTATION MULTIRESOLUTION DES DONNEES. ELLE PERMET DE REDUIRE SENSIBLEMENT LE NOMBRE DE PIXELS DE L'IMAGE D'ATTRIBUTS REPRESENTANT DE ZONES INTER-REGIONS ET MINIMISE DE CE FAIT, L'AMBIGUITE SUR LA LOCALISATION PRECISE DES FRONTIERES. DE PLUS, LES DIMENSIONS VARIABLES DU VOISINAGE PYRAMIDAL EN FONCTION DU NIVEAU DE RESOLUTION, SUGGERENT L'ELABORATION D'UN PROCESSUS DE SEGMENTATION EVOLUANT SUIVANT UNE STRATEGIE DU PLUS GROSSIER AU PLUS FIN: LES MEILLEURS PROTOTYPES DE CHAQUE CLASSE DE TEXTURE SONT DETERMINES A L'AIDE D'UN ALGORITHME QUI MET EN UVRE UN CLASSIFICATEUR FLOU. CES PROTOTYPES PERMETTENT DE REALISER UNE SEGMENTATION GROSSIERE AU NIVEAU DE RESOLUTION LE PLUS ELEVE. CETTE SEGMENTATION PRIMAIRE EST PROGRESSIVEMENT AFFINEE LORS DE LA DESCENTE DE LA PYRAMIDE EN DIRIGEANT LE PROCESSUS DE SEGMENTATION VERS LES ZONES DE SINGULARITES (ZONES FRONTALIERES OU BRUITEES). LA METHODE PROPOSEE FOURNIT LES MEILLEURS RESULTATS ET REALISE UNE SEGMENTATION SANS RECOUVREMENT DES REGIONS, LORSQUE LA DECOMPOSITION DE L'IMAGE EST EFFECTUEE AVEC L'ONDELETTE DE HAAR
Download or read book Segmentation pyramidale de textures par decomposition en ondelettes written by Georges L.. Loum and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probl mes d chelle dans la segmentation par ondelettes d images textur es written by Sylvain Meignen and published by . This book was released on 2001 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous nous intéressons dans cette thèse à la segmentation d'images texturées à l'aide de frame d'ondelettes. Après avoir étudié les frames, en particulier les relations qui lient l'approche continue à l'approche discrète, nous nous focalisons particulièrement sur l'étude des problèmes d'échelle liés à la segmentation des macro-textures. Nous proposons des algorithmes particulièrement adaptés au traitement spécifique de ce type de textures, qui utilisent de nouvelles caractéristiques : les facteurs principaux d'une analyse en composantes principales. Des liens sont établis avec des caractéristiques plus communément utilisées. Nous montrons ensuite que la régularité Lipschitzienne des textures est un paramètre moins fiable que les facteurs principaux, aux petites échelles. Enfin, nous nous intéressons à la définition des frontières des textures, et construisons un algorithme permettant leur reconstruction partielle. La seconde partie est consacrée à l'étude d'un algorithme de décomposition multi-échelles permettant le suivi d'extrema le long des échelles. Nous regardons les applications possibles de cet algorithme à la détection des bords d'images bruitées ; puis, ces techniques de suivi d'extrema sont appliquées à la détermination du temps de réaction du muscle génioglosse, sur des enregistrements EMG.
Download or read book Wavelets in Neuroscience written by Alexander E. Hramov and published by Springer Nature. This book was released on 2021-06-16 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book illustrates how modern mathematical wavelet transform techniques offer fresh insights into the complex behavior of neural systems at different levels: from the microscopic dynamics of individual cells to the macroscopic behavior of large neural networks. It also demonstrates how and where wavelet-based mathematical tools can provide an advantage over classical approaches used in neuroscience. The authors well describe single neuron and populational neural recordings. This 2nd edition discusses novel areas and significant advances resulting from experimental techniques and computational approaches developed since 2015, and includes three new topics: • Detection of fEPSPs in multielectrode LFPs recordings. • Analysis of Visual Sensory Processing in the Brain and BCI for Human Attention Control; • Analysis and Real-time Classification of Motor-related EEG Patterns; The book is a valuable resource for neurophysiologists and physicists familiar with nonlinear dynamical systems and data processing, as well as for graduate students specializing in these and related areas.
Download or read book Wavelets in Geophysics written by Efi Foufoula-Georgiou and published by Elsevier. This book was released on 2014-06-28 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of wavelet analysis to the geophysical sciences grew from Jean Morlet's work on seismic signals in the 1980s. Used to detect signals against noise, wavelet analysis excels for transients or for spatiallylocalized phenomena. In this fourth volume in the renown WAVELET ANALYSIS AND ITS APPLICATIONS Series, Efi Foufoula-Georgiou and Praveen Kumar begin with a self-contained overview of the nature, power, and scope of wavelet transforms. The eleven originalpapers that follow in this edited treatise show how geophysical researchers are using wavelets to analyze such diverse phenomena as intermittent atmospheric turbulence, seafloor bathymetry, marine and other seismic data, and flow in aquifiers. Wavelets in Geophysics will make informative reading for geophysicists seeking an up-to-date account of how these tools are being used as well as for wavelet researchers searching for ideas for applications, or even new points of departure. Includes twelve original papers written by experts in the geophysical sciences Provides a self-contained overview of the nature, power, and scope of wavelet transforms Presents applications of wavelets to geophysical phenomena such as: The sharp events of seismic data, Long memory processes, such as fluctuation in the level of the Nile, A structure preserving decomposition of turbulence signals
Download or read book Wavelets and Filter Banks written by Gilbert Strang and published by SIAM. This book was released on 1996-10-01 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive treatment of wavelets for both engineers and mathematicians.
Download or read book Elements of Neurogeometry written by Jean Petitot and published by Springer. This book was released on 2017-11-08 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes several mathematical models of the primary visual cortex, referring them to a vast ensemble of experimental data and putting forward an original geometrical model for its functional architecture, that is, the highly specific organization of its neural connections. The book spells out the geometrical algorithms implemented by this functional architecture, or put another way, the “neurogeometry” immanent in visual perception. Focusing on the neural origins of our spatial representations, it demonstrates three things: firstly, the way the visual neurons filter the optical signal is closely related to a wavelet analysis; secondly, the contact structure of the 1-jets of the curves in the plane (the retinal plane here) is implemented by the cortical functional architecture; and lastly, the visual algorithms for integrating contours from what may be rather incomplete sensory data can be modelled by the sub-Riemannian geometry associated with this contact structure. As such, it provides readers with the first systematic interpretation of a number of important neurophysiological observations in a well-defined mathematical framework. The book’s neuromathematical exploration appeals to graduate students and researchers in integrative-functional-cognitive neuroscience with a good mathematical background, as well as those in applied mathematics with an interest in neurophysiology.
Download or read book An Introduction to Wavelet Analysis written by David F. Walnut and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive presentation of the conceptual basis of wavelet analysis, including the construction and analysis of wavelet bases. It motivates the central ideas of wavelet theory by offering a detailed exposition of the Haar series, then shows how a more abstract approach allows readers to generalize and improve upon the Haar series. It then presents a number of variations and extensions of Haar construction.
Download or read book Image Analysis Sediments and Paleoenvironments written by Pierre Francus and published by Springer Science & Business Media. This book was released on 2007-01-19 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a guide to imaging techniques for sedimentologists, paleolimnologists, paleoceanographers and microscopists involved in paleoenvironmental reconstruction. Case studies illustrate the range of information obtainable from different sediments (marine, lacustrine, aeolian) and different types of samples (cores, embedded blocks, microscopic slides) using different regions of the electromagnetic spectrum (visible, UV, IR, X-ray). Includes comprehensive protocols, guidelines, and recommendations for the use of low cost image analysis techniques.
Download or read book Wavelets and Signal Processing written by Hans-Georg Stark and published by Springer Science & Business Media. This book was released on 2005-04-01 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professor Noubari's recommendation: "Professor Starks book provides an effective entry into the field for engineering students who have little or no prior knowledge of this important subject. Avaibility of collection of computer codes and mfiles in combination with topics of the book, makes the book highly valuable to enhance student learning of the subject matter."
Download or read book Wavelets written by Bozzano G Luisa and published by Academic Press. This book was released on 2012-12-02 with total page 737 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wavelets: A Tutorial in Theory and Applications is the second volume in the new series WAVELET ANALYSIS AND ITS APPLICATIONS. As a companion to the first volume in this series, this volume covers several of the most important areas in wavelets, ranging from the development of the basic theory such as construction and analysis of wavelet bases to an introduction of some of the key applications, including Mallat's local wavelet maxima technique in second generation image coding. A fairly extensive bibliography is also included in this volume. - Covers several of the most important areas in wavelets, ranging from the development of the basic theory, such as: Construction and analysis of wavelet bases - Introduction of some of the key applications, including Mallat's local wavelet maxima technique in second generation image coding - Extensive bibliography is also included in this volume - Companion to the first volume in this series, An Introduction to Wavelets, and can be used as supplementary instructional material for a two-semester course on wavelet analysis
Download or read book Wavelet Theory and Application written by Andrew Laine and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, Moulin considers the problem of forming radar images under a diffuse-target statistical model. His estimation approach includes application of the maximum-likelihood principle and a regularization procedure based on wavelet representations. In addition, he shows that the radar imaging problem can be seen as a problem of inference on the wavelet coefficients of an image corrupted by additive noise. The aim of this special issue is to provide a forum in which researchers from the fields of mathematics, computer science, and electrical engineering who work on problems of significance to computer vision can better understand each other. I hope that the papers included in this special issue will provide a clearer picture of the role of wavelet transforms and the principles of multiresolution analysis. I wish to thank many people for their contributions and assistance in this project: Gerhard Ritter, the Editor-in-Chief of the Journal of Mathematical Imaging and Vision, who invited me to organize this issue and who provided patient guidance; the researchers who submitted papers for consideration and others who have contributed to the explosion of growth in this area; the reviewers, who provided careful and thoughtful evaluations in a timely fashion; and, finally, from these efforts, the authors of the papers selected for publication in the special issue. Andrew Laine Guest Editor Center for Computer Vision and Visualization Department of Computer and Information Sciences University of Florida Journal of Mathematical Imaging and Vision, 3, 7-38 (1993). © Kluwer Academic Publishers. Manufactured in The Netherlands.
Download or read book An Introduction to Wavelets written by Charles K. Chui and published by Elsevier. This book was released on 2016-06-03 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wavelet Analysis and its Applications, Volume 1: An Introduction to Wavelets provides an introductory treatise on wavelet analysis with an emphasis on spline-wavelets and time-frequency analysis. This book is divided into seven chapters. Chapter 1 presents a brief overview of the subject, including classification of wavelets, integral wavelet transform for time-frequency analysis, multi-resolution analysis highlighting the important properties of splines, and wavelet algorithms for decomposition and reconstruction of functions. The preliminary material on Fourier analysis and signal theory is covered in Chapters 2 and 3. Chapter 4 covers the introductory study of cardinal splines, while Chapter 5 describes a general approach to the analysis and construction of scaling functions and wavelets. Spline-wavelets are deliberated in Chapter 6. The last chapter is devoted to an investigation of orthogonal wavelets and wavelet packets. This volume serves as a textbook for an introductory one-semester course on "wavelet analysis for upper-division undergraduate or beginning graduate mathematics and engineering students.
Download or read book Image Models and their Speech Model Cousins written by Stephen Levinson and published by Springer Science & Business Media. This book was released on 1996-08-29 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume explores the interface between two diverse areas of applied mathematics which are both 'customers' of the maximum likelihood methodology; emission tomography and hidden Markov models as an approach to speech understanding. Other areas where maximum likelihood is used in this volume include parsing of text (Jelinek), microstructure of materials (Ji), DNA sequencing (Nelson). Most of the participants were in the main areas of speech or emission density reconstruction.
Download or read book Wavelets in Chemistry written by Beata Walczak and published by Elsevier. This book was released on 2000-05-10 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wavelets seem to be the most efficient tool in signal denoising and compression. They can be used in an unlimited number of applications in all fields of chemistry where the instrumental signals are the source of information about the studied chemical systems or phenomena, and in all cases where these signals have to be archived. The quality of the instrumental signals determines the quality of answer to the basic analytical questions: how many components are in the studied systems, what are these components like and what are their concentrations? Efficient compression of the signal sets can drastically speed up further processing such as data visualization, modelling (calibration and pattern recognition) and library search. Exploration of the possible applications of wavelets in analytical chemistry has just started and this book will significantly speed up the process. The first part, concentrating on theoretical aspects, is written in a tutorial-like manner, with simple numerical examples. For the reader's convenience, all basic terms are explained in detail and all unique properties of wavelets are pinpointed and compared with the other types of basis function. The second part presents applications of wavelets from many branches of chemistry which will stimulate chemists to further exploration of this exciting subject.
Download or read book Multisensor Fusion written by Anthony K. Hyder and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 929 pages. Available in PDF, EPUB and Kindle. Book excerpt: For some time, all branches of the military have used a wide range of sensors to provide data for many purposes, including surveillance, reconnoitring, target detection and battle damage assessment. Many nations have also attempted to utilise these sensors for civilian applications, such as crop monitoring, agricultural disease tracking, environmental diagnostics, cartography, ocean temperature profiling, urban planning, and the characterisation of the Ozone Hole above Antarctica. The recent convergence of several important technologies has made possible new, advanced, high performance, sensor based applications relying on the near-simultaneous fusion of data from an ensemble of different types of sensors. The book examines the underlying principles of sensor operation and data fusion, the techniques and technologies that enable the process, including the operation of 'fusion engines'. Fundamental theory and the enabling technologies of data fusion are presented in a systematic and accessible manner. Applications are discussed in the areas of medicine, meteorology, BDA and targeting, transportation, cartography, the environment, agriculture, and manufacturing and process control.
Download or read book Wavelet Analysis and Applications written by Tao Qian and published by Springer Science & Business Media. This book was released on 2007-02-24 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reflects the latest developments in the area of wavelet analysis and its applications. Since the cornerstone lecture of Yves Meyer presented at the ICM 1990 in Kyoto, to some extent, wavelet analysis has often been said to be mainly an applied area. However, a significant percentage of contributions now are connected to theoretical mathematical areas, and the concept of wavelets continuously stretches across various disciplines of mathematics. Key topics: Approximation and Fourier Analysis Construction of Wavelets and Frame Theory Fractal and Multifractal Theory Wavelets in Numerical Analysis Time-Frequency Analysis Adaptive Representation of Nonlinear and Non-stationary Signals Applications, particularly in image processing Through the broad spectrum, ranging from pure and applied mathematics to real applications, the book will be most useful for researchers, engineers and developers alike.
