Download or read book ANALYSE ET COMPRESSION D IMAGES MODELISATION VECTORIELLE DECOMPOSITION EN SOUS BANDES ET ASPECTS DE QUANTIFICATION written by JAN.. SKOWRONSKI and published by . This book was released on 1996 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PRESENTE THESE EXAMINE PLUSIEURS ASPECTS DE LA COMPRESSION D'IMAGES OU DE SEQUENCES D'IMAGES. EN ANALYSE, DEUX NOUVELLES METHODES PRINCIPALES SONT PRESENTEES. LA MODELISATION VECTORIELLE DECRIT CHAQUE COMPOSANTE D'UNE IMAGE PAR UN JEU DE SINUSOIDES EXPONENTIELLES. LA QUALITE DE CETTE MODELISATION PEUT ETRE AMELIOREE PAR UN ALGORITHME DE PROJECTIONS SUCCESSIVES DONT LES PROPRIETES DE CONVERGENCE SONT ANALYSEES. UN SYSTEME DE COMPRESSION D'IMAGES, QUI MONTRE DE BONNES PERFORMANCES POUR DES IMAGES STATIONNAIRES/PERIODIQUES EST PROPOSE. LA TRANSFORMATION MSTP EST UN AUTRE OUTIL D'ANALYSE INSPIRE DE LA DECOMPOSITION DYADIQUE EN SOUS-BANDES. ELLE CONSISTE EN UNE TRANSFORMEE EN ONDELETTES SUIVIE D'UNE TRANSFORMATION DES TROIS COEFFICIENTS DE DETAIL EN COORDONNEES SPHERIQUES ET ELLE PERMET L'EXPLOITATION DES INTERCORRELATIONS DES SOUS-BANDES DU MEME NIVEAU DE RESOLUTION, SANS AUGMENTER LA COMPLEXITE DU CODEUR. UN SYSTEME DE COMPRESSION EST CONCU ET COMPARE AVEC SUCCES A DES SYSTEMES ETABLIS COMME JPEG ET LE SYSTEME DIT ZEROTREES. NOUS DECRIVONS EGALEMENT DEUX METHODES DE QUANTIFICATION, TOUTES DEUX VECTORIELLES. POUR LA QUANTIFICATION VECTORIELLE PERMUTATIVE, IL EST MONTRE EXPERIMENTALEMENT QU'ELLE PEUT DEPASSER LES PERFORMANCES DE LA QUANTIFICATION VECTORIELLE (QV) CONVENTIONNELLE. POUR LA QUANTIFICATION VECTORIELLE SPHERIQUE SOUS CONTRAINTE ENTROPIQUE ET SOUS CONTRAINTE DE NIVEAUX, L'ANALYSE THEORIQUE EST EFFECTUEE POUR DES DEBITS ELEVES. SOUS CERTAINES HYPOTHESES, ON PEUT DEMONTRER QU'A COMPLEXITE EGALE, CETTE DERNIERE METHODE PEUT AVOIR DES GAINS DE CODAGE SUPERIEURS A CEUX DE LA QV CONVENTIONNELLE. FINALEMENT, UN ALGORITHME D'ESTIMATION ET DE COMPENSATION DE MOUVEMENT DANS LES SOUS-BANDES D'UNE DECOMPOSITION DYADIQUE EST PRESENTE. DE PLUS UNE METHODE DE QUANTIFICATION DES COEFFICIENTS DE L'ERREUR DE PREDICTION EST PROPOSEE

Download or read book CONTRIBUTION A L ETUDE ET AU DEVELOPPEMENT D ALGORITHMES DE TRAITEMENT DU SIGNAL EN COMPRESSION DE DONNEES ET D IMAGES written by GILBERT.. FURLAN and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE A POUR BUT D'UNE PART LA COMPRESSION DE DONNEES SANS PERTE D'INFORMATION, ET D'AUTRE PART LA COMPRESSION D'IMAGES FIXES. LA COMPRESSION DE DONNEES EST BASEE SUR UNE MODELISATION MARKOVIENNE ADAPTATIVE D'ORDRE VARIABLE REALISEE PAR L'ALGORITHME DU CONTEXTE QUI APPROXIME LA COMPLEXITE STOCHASTIQUE DE LA SOURCE EN UTILISANT LE PRINCIPE DE LA LONGUEUR DE DESCRIPTION MINIMALE (LDM). LE CODAGE EST OBTENU PAR UN CODAGE ARITHMETIQUE MULTI-NIVEAUX. NOUS NOUS ATTACHONS DANS UN PREMIER TEMPS, A MINIMISER L'OCCUPATION MEMOIRE EN APPLIQUANT LE PRINCIPE DE LA LDM AU DEVELOPPEMENT DU MODELE. NOUS MONTRONS DANS UN DEUXIEME TEMPS QUE L'APPLICATION DIFFERENTIELLE DE LA LDM POUR LE CHOIX DES NUDS DE CODAGE PERMET D'OPTIMISER LA GESTION DU MODELE EN ARBRE. NOUS MONTRONS ENFIN QUE L'ALGORITHME AINSI MODIFIE PERMET D'ATTEINDRE LES TAUX DE COMPRESSION LES PLUS ELEVES A L'HEURE ACTUELLE ET CE POUR UN ENSEMBLE DE SOURCES MULTI-MEDIA ET UNE COMPLEXITE MOYENNE. NOUS AVONS ADOPTE POUR LA COMPRESSION DES IMAGES FIXES UNE DECOMPOSITION EN SOUS-BANDES PAR LES FILTRES DE JOHNSTON. DANS LE CADRE D'UN CODAGE A FAIBLE COMPLEXITE DES SIGNAUX DE SOUS-BANDE PAR QUANTIFICATION ET DPCM, NOUS INTRODUISONS UN ALGORITHME D'ALLOCATION DES RESSOURCES DE CODAGE A FACTEUR PSYCHOVISUEL. NOUS PROPOSONS ENSUITE, UN CODAGE PAR QUANTIFICATION VECTORIELLE PREDICTIVE. NOUS REDUISONS ALORS LA TAILLE MEMOIRE REQUISE POUR LE STOCKAGE DU REPERTOIRE PAR L'UTILISATION D'UN REPERTOIRE LINEAIRE QUE NOUS RENDONS EN PARTIE ADAPTATIF. ENFIN, NOUS MONTRONS QUE LE CODAGE ENTROPIQUE PAR L'ALGORITHME DU CONTEXTE DES SIGNAUX CODES PERMET UNE DIMINUTION MOYENNE DU DEBIT DE L'ORDRE DE 30% SANS PERTE DE QUALITE. APPLIQUE DIRECTEMENT AUX SIGNAUX DE SOUS-BANDES, NOUS OBTENONS DES IMAGES DE QUALITE EXCEPTIONNELLE POUR DES DEBITS COMPRIS ENTRE 1 ET 1.5 BITS/PIXEL

Download or read book CONTRIBUTION A LA COMPRESSION D IMAGES PAR QUANTIFICATION VECTORIELLE ALGORITHMES ET CIRCUIT INTEGRE SPECIFIQUE written by NABIL.. AKROUT and published by . This book was released on 1995 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PREMIERE PARTIE DU MEMOIRE DECRIT LE DEVELOPPEMENT D'ALGORITHMES ORIGINAUX TRES RAPIDES DE GENERATION DES CATALOGUES NECESSAIRES A LA QUANTIFICATION VECTORIELLE. UNE COMPARAISON DE NOS ALGORITHMES AVEC LES ALGORITHMES CLASSIQUES EST EGALEMENT REALISEE. ENSUITE, NOUS PROPOSONS UNE METHODE DE QUANTIFICATION VECTORIELLE HIERARCHIQUE ADAPTEE A L'ANALYSE DE L'IMAGE EN SOUS-BANDES. APRES DECOMPOSITION PYRAMIDALE DE L'IMAGE EN IMAGE SOUS-BANDES, ON PROCEDE A LA QUANTIFICATION VECTORIELLE DIRECTIONNELLE DES SOUS-BANDES AVEC DES MOTS CODES DE FORME ET DE TAILLE ADAPTEES A LA RESOLUTION ET A LA DIRECTION DES DETAILS. LA DEUXIEME PARTIE DE CE MEMOIRE DEFINIT UNE ARCHITECTURE ORIGINALE DE CIRCUIT CMOS A GRANDE ECHELLE D'INTEGRATION POUR LA QUANTIFICATION VECTORIELLE. LE DEBIT D'ENTREE MAXIMAL A ETE FIXE A 15 MPIXELS/SECONDE, AFIN DE S'INTEGRER DANS LA LIGNEE DES CIRCUITS EXISTANTS TOUT EN RESTANT DANS UN DOMAINE DE FAISABILITE ACCEPTABLE. SEUL UN PARALLELISME MASSIF PEUT SATISFAIRE LA CONTRAINTE DE VITESSE. CEPENDANT, POUR LIMITER LA SURFACE DE SILICIUM, NOUS AVONS PROPOSE UN TRAITEMENT ORIGINAL AVEC UNE ARCHITECTURE BIT-SERIE PIPELINE ET UN FORT PARALLELISME AU NIVEAU DU CALCUL DES DISTANCES. L'ARCHITECTURE DE CE CIRCUIT A ETE BREVETEE (BREVET D'INVENTION N 9402482)

Download or read book BANCS DE FILTRES ET QUANTIFICATION VECTORIELLE SUR RESEAU written by PATRICE.. ONNO and published by . This book was released on 1996 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE EST CONSACREE A LA COMPRESSION D'IMAGES OU DEUX THEMES MAJEURS SONT ETUDIES: IL S'AGIT DE LA TRANSFORMATION EN SOUS-BANDES ET DE LA QUANTIFICATION. POUR LA DECOMPOSITION EN SOUS-BANDES, NOUS MONTRONS, DANS CE DOCUMENT, QU'IL EST POSSIBLE DE SYNTHETISER DES FILTRES A DEUX SOUS-BANDES, SUIVANT PLUSIEURS CRITERES, A PARTIR D'UNE SEULE METHODE DE SYNTHESE BASEE SUR UNE STRUCTURE EN TREILLIS. DES CRITERES PERMETTANT DE PRENDRE EN COMPTE LES CARACTERISTIQUES DES IMAGES POUR DES APPLICATIONS DE COMPRESSION SONT CONSIDERES ET DE NOMBREUX FILTRES SYNTHETISES SUIVANT CES CRITERES SONT FOURNIS. UN NOUVEAU FORMALISME POUR DES DECOMPOSITIONS EN M SOUS-BANDES EST AUSSI PRESENTE DANS CE MEMOIRE. PARTANT D'UNE DECOMPOSITION POLYPHASE PARTICULIERE, NOUS MONTRONS QU'IL EST POSSIBLE DE GENERALISER LA SYNTHESE DES BANCS DE FILTRES MODULES, SANS FAIRE AUCUNE HYPOTHESE A LA FOIS SUR LA LONGUEUR ET LA PHASE DU FILTRE PROTOTYPE. DES CRITERES ANALOGUES AU CAS D'UNE DECOMPOSITION A DEUX CANAUX SONT UTILISES. LA QUANTIFICATION EST REALISEE DANS LE BUT DE MINIMISER LA DISTORSION ENGENDREE POUR UN DEBIT DONNE. CETTE ALLOCATION OPTIMALE DE RESSOURCES EST REALISEE A PARTIR D'UN ALGORITHME DE PROGRAMMATION CONVEXE ET D'UN ENSEMBLE DE QUANTIFICATEURS PREDEFINIS. NOUS AVONS CHOISI DE PRENDRE DES QUANTIFICATEURS VECTORIELS SUR RESEAU POUR CONSTITUER CET ENSEMBLE. DEUX METHODES ORIGINALES POUR AUGMENTER LES PERFORMANCES DE CES QUANTIFICATEURS SONT PRESENTEES. L'UNE APPORTE UNE CONTRAINTE D'ENTROPIE SUR LE RESEAU, CE QUI PERMET, LORS DE LA QUANTIFICATION, DE PROJETER UN VECTEUR SUR LE RESEAU SUIVANT LE MEILLEUR COMPROMIS DEBIT-DISTORSION. L'AUTRE METHODE PERMET DE SUBDIVISER LA SOURCE DE VECTEURS A CODER EN SOUS-SOURCES AFIN DE PRENDRE EN COMPTE, A BAS DEBITS, CERTAINES DIRECTIONS PRIVILEGIEES DE L'ESPACE. DES COMPARAISONS, A LA FOIS, ENTRE LES DIFFERENTES DECOMPOSITIONS ET PLUSIEURS METHODES DE QUANTIFICATIONS (SCALAIRES, VECTORIELLES, PSYCHOVISUELLES) SONT ENTREPRISES. LA MISE EN PLACE DE CES DIFFERENTES APPROCHES DANS UN SCHEMA VIDEO HYBRIDE NOUS A PERMIS DE REDUIRE LE DEBIT D'ENVIRON 20% PAR RAPPORT AU STANDARD MPEG 2. ENFIN, NOUS ETUDIONS DEUX TECHNIQUES DE DECOMPOSTIONS BASEES REGIONS. ASSOCIEES A L'ALGORITHME D'ALLOCATION BINAIRE PRECEDENT, DES FONCTIONNALITES DE COMPRESSION SELECTIVE DE REGIONS SONT MISE EN EVIDENCE. DES EXEMPLES SUR DES IMAGES DE VISIOPHONE MONTRENT L'INTERET DE CES APPROCHES

Download or read book Contribution aux techniques de compression d image written by Marc Hohenadel and published by . This book was released on 1994 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'introduction massive de l'image numérique dans la seconde partie de ce siècle conduit à manipuler des masses d'informations de plus en plus importantes. Les méthodes de compression d'image sont une solution pour éliminer l'information non pertinente et ainsi réduire la masse d'informations numériques d'une image. Parmi les nombreuses méthodes de compression d'image, les méthodes utilisant les outils mathématiques de l'analyse par ondelettes sont très prometteuses. Ce mémoire présente une nouvelle méthode de compression d'image de dernière génération utilisant deux outils de l'analyse par ondelettes : la décomposition en sous-bandes et la transformée en ondelettes. Après avoir détaillé cette nouvelle méthode de compression, l'ensemble des outils mathématiques utiles à la compréhension de son principe sera explicite en détail. Entre autre, seront explicitées du point de vue mathématique, les transformées orthogonales comme Fourier, Hadamard, Walsh,... la transformée en ondelettes de Haar, et les décompositions en sous-bandes. Une implémentation informatique de chacun des outils présentés sera aussi proposée. Pour finir, nous comparerons les résultats de la nouvelle méthode de compression à la norme de compression JPEG

Download or read book Acoustics of Porous Media written by Thierry Bourbié and published by Editions TECHNIP. This book was released on 1987 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Underwater Acoustic Data Processing written by Y. T. Chan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the papers that were accepted for presentation at the 1988 NATO Advanced Study Institute on Underwater Acoustic Data Processing, held at the Royal Military College of Canada from 18 to 29 July, 1988. Approximately 110 participants from various NATO countries were in attendance during this two week period. Their research interests range from underwater acoustics to signal processing and computer science; some are renowned scientists and some are recent Ph.D. graduates. The purpose of the ASI was to provide an authoritative summing up of the various research activities related to sonar technology. The exposition on each subject began with one or two tutorials prepared by invited lecturers, followed by research papers which provided indications of the state of development in that specific area. I have broadly classified the papers into three sections under the titles of I. Propagation and Noise, II. Signal Processing and III. Post Processing. The reader will find in Section I papers on low frequency acoustic sources and effects of the medium on underwater acoustic propagation. Problems such as coherence loss due to boundary interaction, wavefront distortion and multipath transmission were addressed. Besides the medium, corrupting noise sources also have a strong influence on the performance of a sonar system and several researchers described methods of modeling these sources.

Download or read book New Trends in Intercalation Compounds for Energy Storage written by Christian Julien and published by Springer Science & Business Media. This book was released on 2002-04-30 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in electrochemistry and materials science have opened the way to the evolution of entirely new types of energy storage systems: rechargeable lithium-ion batteries, electrochroms, hydrogen containers, etc., all of which have greatly improved electrical performance and other desirable characteristics. This book encompasses all the disciplines linked in the progress from fundamentals to applications, from description and modelling of different materials to technological use, from general diagnostics to methods related to technological control and operation of intercalation compounds. Designing devices with higher specific energy and power will require a more profound understanding of material properties and performance. This book covers the status of materials and advanced activities based on the development of new substances for energy storage.

Download or read book Introduction to ISDN written by and published by Wiley-Blackwell. This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Nanomaterials and Nanochemistry written by C. Bréchignac and published by Springer Science & Business Media. This book was released on 2008-01-01 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a brilliant book that covers the major aspects of nanomaterials production. It integrates the many and varied chemical, material and thermo-dynamical facets of production, offering readers a new and unique approach to the subject. The mechanical, optical, and magnetic characteristics of nanomaterials are also presented in detail. Nanomaterials are a fast developing field of research and this book serves as both a reference work for researchers and a textbook for graduate students.

Download or read book Remote Sensing for Archaeological Heritage Management written by David Cowley and published by Archaeolingua. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remote sensing is one of the main foundations of archaeological data, underpinning knowledge and understanding of the historic environment. The volume, arising from a symposium organised by the Europae Archaeologiae Consilium (EAC) and the Aerial Archaeology Research Group (AARG), provides up to date expert statements on the methodologies, achievements and potential of remote sensing with a particular focus on archaeological heritage management. Well-established approaches and techniques are set alongside new technologies and data-sources, with discussion covering relative merits and applicability, and the need for integrated approaches to understanding and managing the landscape. Discussions cover aerial photography, both modern and historic, LiDAR, satellite imagery, multi- and hyper-spectral data, sonar and geophysical survey, addressing both terrestrial and maritime contexts. Case studies drawn from the contrasting landscapes of Europe illustrate best practice and innovative projects.

Download or read book Low Frequency Scattering written by George Dassios and published by Oxford University Press. This book was released on 2000 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattering theory deals with the interactions of waves with obstacles in their path, and low frequency scattering occurs when the obstacles involved are very small. This book gives an overview of the subject for graduates and researchers, for the first time unifying the theories covering acoustic, electromagnetic and elastic waves.

Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.

Download or read book Speech Enhancement written by Philipos C. Loizou and published by CRC Press. This book was released on 2013-02-25 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the proliferation of mobile devices and hearing devices, including hearing aids and cochlear implants, there is a growing and pressing need to design algorithms that can improve speech intelligibility without sacrificing quality. Responding to this need, Speech Enhancement: Theory and Practice, Second Edition introduces readers to the basic pr