Download or read book Segmentation d images fond e sur une m thode de croissance de r gion control e par un mod le g om trique de contours written by Salim Djeziri and published by . This book was released on 1994 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE DEVELOPPE UNE APPROCHE POUR LA SEGMENTATION D'IMAGES EN PROPOSANT DES OUTILS FONDES SUR UNE DEFINITION DUALE DU CONTOUR CONSIDERE COMME UNE LIGNE SEPARANT DEUX REGIONS AUX ATTRIBUTS DIFFERENTS. DEUX ALGORITHMES DE CROISSANCE DE REGIONS SONT DEVELOPPES. LE PREMIER ALGORITHME (ALGORITHME DU CARRELEUR) FAIT CROITRE UN CARRE INITIAL PAR DEPLACEMENT D'ARETES ET PAR INSERTION D'ARETES SUPPLEMENTAIRES. LE DEUXIEME ALGORITHME FAIT CROITRE UNE COURBE QUELCONQUE EN DEPLACANT CHAQUE POINT SUR LA NORMALE ET EN INSERANT DES POINTS SUPPLEMENTAIRES. L'EVOLUTION DE LA COURBE EST REGIE PAR UN SEUL PARAMETRE. NOUS PROPOSONS UNE METHODE ADAPTATIVE DE LISSAGE DE COURBES DISCRETES DONT L'ORIGINALITE EST FONDEE SUR UNE MINIMISATION DE L'ERREUR QUADRATIQUE LOCALE AUTOUR DE CHAQUE POINT. UN PARAMETRE UNIQUE PERMET DE FACON SIMPLE DE CONTROLER LA FORCE DU LISSAGE QUI PEUT PASSER GRADUELLEMENT DE L'INTERPOLATION A L'APPROXIMATION. ELLE PREND EN COMPTE LE GRADIENT EN CHAQUE POINT POUR OBTENIR UNE COURBE REGULIERE QUI RESPECTE MIEUX LA FORME DE L'OBJET PRESENT DANS L'IMAGE

Download or read book Segmentation d images fondee sur une methode de croissance de region controlee par un modele geometrique de contours written by Salim Djeziri and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book M thodes d acc l ration et approches supervis es pour les contours actifs written by Julien Olivier and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, plusieurs approches permettant d'améliorer les contours actifs sont présentées. Trois méthodes d'accélération ont été développées pour les modèle paramétriques se déformant par évolution gloutonne et appliquées à la segmentation 2D et 3D. Leur principe est d'autoriser une gestion dynamique de la grille de voisinage de chaque point de contrôle du contour actif. Deux modèles supervisés implémentés à l'aide des ensembles de niveaux sont également détaillés. Ceux-ci se basent sur les caractéristiques de textures d'Haralick et utilisent une image d'apprentissage possédant une segmentation experte. Le premier modèle est un contour actif basé région inspiré du modèle de Chan et Vese. Le principe de la programmation linéaire est alors utilisé pour déterminer le poids optimal à affecter à chaque coefficient d'Haralick. Le deuxième modèle introduit un classificateur binaire, appris grâce à la segmentation experte, directement dans l'équation d'évolution du contour actif. Les deux modèles sont appliqués à la segmentation d'images texturées 2D et 3D.

Download or read book Croissance de r gion variationnelle et contraintes g om triques tridimensionnelles pour la segmentation d image written by Jean-Loïc Rose and published by . This book was released on 2008 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: La segmentation d'image par croissance de région est une méthode permettant de localiser et d'extraire un objet dans une image. Pour répondre aux difficultés de la segmentation, nous nous sommes intéressés à l'intégration d'apriori de forme dans la croissance de région. Deux contributions originales sont présentées dans ce manuscrit. La première contribution consiste à proposer une nouvelle vision de la croissance de région en décrivant son processus dans un cadre variationnel. Dans cette approche, la région est modélisée par une fonction caractéristique discrète. Nous déterminons l'équation d'évolution de cette fonction en adoptant une approche variationnelle. La croissance de région variationnelle se distingue des croissance de région classiques, qui évoluent tant qu'un critère d'homogénéité est respecté, en intégrant une minimisation d'énergie dans son processus d'évolution. Cette stratégie lui assure une convergence, sans avoir à fixer un seuil minimal d'homogénéité. Dans la deuxième contribution, nous définissons une contrainte géométrique tridimensionnelle pour la segmentation, basée sur des descripteurs région. La contrainte de forme proposée est construite à partir des moments de Tchebychev. Un terme de pondération permet d'optimiser notre a priori et de tenir compte de la hiérarchie des moments de Tchebychev. Nous mettons en avant nos contributions en intégrant la contrainte de forme dans la croissance de région variationnelle. L'évaluation qualitative et quantitative de la croissance de région variationnelle est réalisée à partir de tests effectués sur des images synthétiques et biomédicales. Les résultats mettent en évidence l'amélioration apportée par l’a priori de forme et notamment comment celui-ci réussit à contraindre l’évolution de la croissance.

Download or read book DETECTION DE CONTOURS ET SEGMENTATION D IMAGES written by QINGMIN.. LIAO and published by . This book was released on 1994 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LE CADRE DE CETTE THESE, NOUS AVONS DEVELOPPE UNE METHODE DE DETECTION DE CONTOURS ET UNE METHODE DE SEGMENTATION D'IMAGES AFIN D'ABOUTIR A UNE MEILLEURE INTERPRETATION DES IMAGES. LA PREMIERE METHODE PERMET UNE LOCALISATION PRECISE ET UNE DETECTION DE CONTOURS INSENSIBLE AU BRUIT. LA PRECISION DE LA LOCALISATION A ETE OBTENUE EN AGRANDISSANT LE SUPPORT DE L'IMAGE. POUR REDUIRE L'INFLUENCE DU BRUIT, UN INDICE DE CONFIANCE DU CONTOUR TENANT COMPTE DE LA REGULARITE DE LA SURFACE LOCALE ET DE CERTAINS CRITERES LIES A LA PERCEPTION VISUELLE A ETE ETABLI. LA METHODE DE SEGMENTATION BASEE SUR UNE COOPERATION CONTOUR-REGION EST EFFECTUEE EN DEUX ETAPES: FERMETURE DE CONTOURS ET CLASSIFICATION DE PARCELLES. TROIS METHODES DE MODELISATION DE TEXTURES ONT ETE MISES AU POINT ET TESTEES LORS DE LA PHASE DE LA CLASSIFICATION. DEUX APPLICATIONS ONT ETE ETUDIEES. LA PREMIERE CONSISTE A IDENTIFIER DES PLANTATIONS FORESTIERES DANS UNE IMAGE SATELLITAIRE. CECI A ETE REALISE PAR NOTRE APPROCHE DE SEGMENTATION. LA DEUXIEME APPLICATION PORTAIT SUR LA CLASSIFICATION DE DIFFERENTES CATEGORIES D'UFS DE POISSONS ET SUR L'IDENTIFICATION DE LEURS STADES DE CROISSANCE. POUR CELA, LES STRUCTURES BIOLOGIQUES SIGNIFICATIVES ONT ETE TOUT D'ABORD DETECTEES ; ENSUITE, LES PARAMETRES PERTINENTS ONT ETE EXTRAITS ; ENFIN, LES UFS DE POISSONS ONT ETE IDENTIFIES SELON DES CRITERES BIOLOGIQUES. LES METHODES DEVELOPPEES PERMETTENT DONC D'ANALYSER LES IMAGES PROVENANT DE DIFFERENTS TYPES DE SOURCES ET D'AMELIORER CONSIDERABLEMENT LES RESULTATS DE DETECTION DE CONTOURS ET DE SEGMENTATION D'IMAGES

Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.

Download or read book Local Approximation Techniques in Signal and Image Processing written by Vladimir I︠A︡kovlevich Katkovnik and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.

Download or read book Linguistic Concepts written by Kenneth Lee Pike and published by . This book was released on 1982 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book will introduce linguistics and tagmemics to undergraduates, graduate students, and scholars in linguistics, anthropology, and other social sciences. It explains the concerns of linguistics, locates linguistics in that much larger field of human behavior that other disciplines share, and presents language from a vantage that acknowledges their particular concerns."--Back cover.

Download or read book Great Historical Geographical and Poetical Dictionary written by Louis Moreri and published by Routledge. This book was released on 2004-11 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proof Theory and Automated Deduction written by Jean Goubault-Larrecq and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Semiotics of the Media written by Winfried Nöth and published by Walter de Gruyter GmbH & Co KG. This book was released on 2016-12-19 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide to Cretan Antiquities written by Kōstēs Davaras and published by Park Ridge, N.J. : Noyes Press. This book was released on 1976 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cape Gelidonya a Bronze Age Shipwreck written by George Fletcher Bass and published by . This book was released on 1967 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Aegean and the Orient in the Second Millennium B C written by Helene J. Kantor and published by . This book was released on 1997 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in Islamic History and Institutions written by Shelomo Dov Goitein and published by BRILL. This book was released on 2010 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Goitein s selection of studies dealing with Islamic institutions and social history offers a general introduction to Islamic civilization by one who lived all his life with Islam. His fruit of specialized research gives a rounded view of important aspects of Islamic civilization and provides the student with an opportunity to acquaint himself not only with the results of research, but also with the methods by which they were obtained. With a new foreword by Norman A. Stillman

Download or read book Under the Mediterranean written by Honor Frost and published by . This book was released on 1963 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Honor Frost has written a travel book with this difference: her journeys have extended below the surface of the sea. Her accounts of these regions can be compared with the writings of early travellers who, unhampered by overspecialization, recorded a variety of observations on completely unknown places. In setting down her direct experience she has thrown new light on the much discussed submect of underwater archaeology. This book contains 22 colour and 28 monochrome photographs by well known divers, also 52 plans and drawings by the author illustrating her arguments. It is addressed to travell.

Download or read book Letters of Medieval Jewish Traders written by S. D. Goitein and published by Princeton University Press. This book was released on 2015-03-08 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern international business has its origins in the overseas trade of the Middle Ages. Of the various communities active in trade in the Islamic countries at that time, records of only the Jewish community survive. Thousands of documents were preserved in the Cairo Geniza, a lumber room attached to the synagogue where discarded writings containing the name of God were deposited to preserve them from desecration. From them Professor Goitein has selected eighty letters that provide a fascinating glimpse into the world of the medieval Jewish traders. As the letters vividly illustrate, international trade depended on a network of personal relationships and mutual confidence. Organization was largely through partnerships, based usually on ties of common religion but often reinforced by family connections. Sometimes the partners of Jews were Christians or Muslims, and the letters show these merchants working together in greater harmony than has been thought, even in partnerships that lasted through generations. The services rendered to a friend or partner and those expected from him were great, and the book opens with an angry letter from a merchant who believed he had been let down by his friend. The life of a trader was full of dangers, as the letter describing a shipwreck illustrates, and put great strain on personal relationships. One of the most moving letters is that written to his wife by a man absent in India for many years while endeavoring to make the family's fortunes. Although never ceasing to love her and longing to be with her, he offers to divorce her if she feels she can wait for him no longer. A decisive event in the life of the great Jewish philosopher, Moses Maimonides, was the death of his brother David, who drowned in the Indian Ocean. Printed here is the last letter David wrote, describing his safe crossing of the desert and announcing his intention to go on to India, against his brother's instructions. Professor Goitein has provided an introduction and notes for each letter, and a general introduction describing the social and spiritual world of the writers, the organization of overseas trade in the Middle Ages, and the goods traded. The letters demonstrate that although it reached from Spain to India, the traders' world was a cohesive one through which these men could move freely and always feel at home. Originally published in 1974. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.