Download or read book Filtrage et restauration en traitement des images numeriques recherche d une mise en oeuvre automatique written by Mohamed Sabri and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book FILTRAGE ET RESTAURATION EN TRAITEMENT DES IMAGES NUMERIQUES written by Mohamed Sabri and published by . This book was released on 1991 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PROBLEME DE RESTITUTION D'UNE SCENE A PARTIR D'UNE IMAGE NUMERIQUE DEGRADEE, SANS INFORMATION A PRIORI, POSE DES DIFFICULTES D'ORDRE THEORIQUE ET PRATIQUE DUES AUX BRUITS SUR LES DONNEES. CE MEMOIRE PRESENTE UNE CONTRIBUTION A L'AUTOMATISATION DES OPERATIONS D'IDENTIFICATION DES SOURCES DE DEGRADATION, DE FILTRAGE ET DE RESTAURATION A PARTIR DE L'IMAGE 2-D OBSERVEE SEULE. LA MODELISATION DES SOURCES DE DEGRADATION PAR L'ETUDE DU MECANISME DE FORMATION DE L'IMAGE, D'UNE PART ET LA MODELISATION DES IMAGES 2-D PAR DES CHAMPS STOCHASTIQUES D'AUTRE PART SERVENT DE BASE A L'ELABORATION D'UN OUTIL D'ANALYSE ET AU DEVELOPPEMENT D'ALGORITHMES DE TRAITEMENT. DES ALGORITHMES DE FILTRAGE DE BRUITS, DE NATURES DIVERSES ET PLUS PARTICULIEREMENT LES BRUITS MULTIPLICATIFS, ONT ETE ETUDIES. L'UTILISATION D'OPERATEURS LOCAUX NOUS A PERMIS DE TENIR COMPTE DE L'ASPECT PRESERVATION DES CONTOURS. PLUSIEURS METHODES DE RESTAURATION D'IMAGES FLOUES, NOTAMMENT UN FILTRAGE DE KALMAN 2-D SEMI-RECURSIF, ONT ETE PROSPECTEES. UNE IDENTIFICATION DU FLOU BASEE SUR CELLE D'UN PROCESSUS ARMA ET UNE ESTIMATION DE LA NATURE DU BRUIT BASEE SUR LA NOTION D'HOMOGENEITE LOCALE SONT PROPOSEES; UN TRAITEMENT OPTIMAL APPROPRIE EST ENSUITE APPLIQUE. NOS RESULTATS SONT COMPARES AVEC CEUX OBTENUS A PARTIR D'ALGORITHMES CONNUS EN TRAITEMENT D'IMAGES.
Download or read book CONTRIBUTION AU PROBLEME DE LA RESTAURATION MYOPE DES IMAGES NUMERIQUES written by SOPHIE.. STRYHANYN CHARDON and published by . This book was released on 1997 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PROBLEMATIQUE ABORDEE DANS CE MEMOIRE S'INSCRIT DANS LA RECHERCHE D'UNE MISE EN OEUVRE AUTOMATIQUE D'UNE CHAINE DE TRAITEMENT DES IMAGES NUMERIQUES ET CONCERNE PLUS PARTICULIEREMENT, DANS CE CONTEXTE, LE PRE-TRAITEMENT DES IMAGES FLOUES. GENERALEMENT, CE PRE-TRAITEMENT COMPORTE DEUX PHASES : D'UNE PART, L'IDENTIFICATION DU FLOU ET, D'AUTRE PART, LA RESTAURATION DE L'IMAGE ORIGINALE. LA RECHERCHE D'UNE MISE EN OEUVRE AUTOMATIQUE NECESSITE L'ANALYSE ET L'EVALUATION DES CONDITIONS DE MISE EN OEUVRE DES DIFFERENTES METHODES EXISTANTES. LE MODELE CANONIQUE DISCRET DE FORMATION DE L'IMAGE OBSERVEE EST INTRODUIT EN PRECISANT LES PRINCIPALES CARACTERISTIQUES DES SYSTEMES IMAGEURS QUI S'Y RATTACHENT. LES METHODES D'IDENTIFICATION DU FLOU ET LES METHODES DE RESTAURATION SONT ENSUITE PRESENTEES AVANT D'ETUDIER LES ALGORITHMES REALISANT CES DEUX ETAPES CONJOINTEMENT. UNE ETUDE EXPERIMENTALE EST ENSUITE REALISEE DE FACON A EVALUER ET COMPARER L'APPROCHE SEQUENTIELLE ET L'APPROCHE CONJOINTE. LES METHODES D'IDENTIFICATION COMPAREES SONT LA CARACTERISATION DES ZEROS DE LA PSF, LA DECOMPOSITION EN MODELES ARMA 1D PARALLELES, LA CONSTRUCTION D'UN SYSTEME LINEAIRE DU 2EME ET DU 3EME ORDRE AINSI QUE LA MINIMISATION DU CRITERE DE LA VALIDATION CROISEE GENERALISEE MONOPARAMETRIQUE. LA MISE EN OEUVRE D'UN ALGORITHME REALISANT CONJOINTEMENT L'ESTIMATION DU FLOU ET CELLE DE L'IMAGE ORIGINALE EST ENSUITE ABORDEE. LES DIFFERENTS TRAVAUX MENES ONT PERMIS DE METTRE EN EVIDENCE LES AVANTAGES ET LES INCONVENIENTS DES ALGORITHMES RECENSES.
Download or read book CONTRIBUTION A LA MISE EN OEUVRE D UNE CHAINE AUTOMATIQUE DE FILTRAGE D IMAGES NUMERIQUES written by LIONEL.. BEAUREPAIRE and published by . This book was released on 1996 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PLUPART DES IMAGES NUMERIQUES SUBISSENT DES DEGRADATIONS LORS DE LEUR FORMATION. IL EST IMPORTANT DE SUPPRIMER CES DEGRADATIONS AFIN DE FACILITER L'EXPLOITATION DE CES IMAGES. L'OBJECTIF DE CETTE THESE EST DE CONCEVOIR UNE CHAINE AUTOMATIQUE DE FILTRAGE D'IMAGES NUMERIQUES EN UTILISANT UN MINIMUM DE CONNAISSANCES A PRIORI SUR L'IMAGE ET SUR LE BRUIT. TROIS TYPES DE BRUIT SONT PRIS EN COMPTE: LE BRUIT IMPULSIONNEL, LE BRUIT ADDITIF ET LE BRUIT MULTIPLICATIF. UNE ETUDE COMPARATIVE DECRITE DANS LA PREMIERE PARTIE PERMET DE MESURER LES PERFORMANCES D'ALGORITHMES DE FILTRAGE AFIN DE SELECTIONNER LES FILTRES LES MIEUX ADAPTES A CHAQUE TYPE DE BRUIT. POUR CELA, DES CRITERES D'EVALUATION SONT DEFINIS. LA MISE EN UVRE DU SYSTEME AUTOMATIQUE NECESSITE TROIS ETAPES: L'IDENTIFICATION DE LA NATURE DU BRUIT, L'ESTIMATION DE SON ECART TYPE ET LE CHOIX DE FILTRES APPROPRIES. DEUX METHODES D'IDENTIFICATION DE LA NATURE DU BRUIT SONT DECRITES. LA PREMIERE CALCULE DES STATISTIQUES LOCALES SUR LES REGIONS LES PLUS HOMOGENES DEFINIES A PARTIR DES MASQUES DE LEE. DES PARAMETRES DEPENDANT DE CES STATISTIQUES CARACTERISENT LA NATURE ADDITIVE OU MULTIPLICATIVE DU BRUIT. L'IDENTIFICATION DU BRUIT IMPULSIONNEL FAIT APPEL A UN ALGORITHME DE FILTRAGE DE BRUIT IMPULSIONNEL. LA SECONDE METHODE N'UTILISE PAS DE DECOUPAGE A PRIORI. ELLE CONSISTE A CONSTRUIRE DES HISTOGRAMMES A PARTIR DE L'IMAGE BRUITEE, CONTROLEE PAR L'IMAGE DE LABELS OBTENUE PAR SEGMENTATION DE L'IMAGE OBSERVEE. LA VARIATION D'UN PARAMETRE EXTRAIT DE CHAQUE HISTOGRAMME CARACTERISE LA NATURE DU BRUIT. LA PROCEDURE D'ESTIMATION DE L'ECART TYPE DU BRUIT CONCERNE LES BRUITS ADDITIFS ET MULTIPLICATIFS. LA METHODE PROPOSEE UTILISE EGALEMENT L'IMAGE BRUITEE SEGMENTEE POUR CREER UN HISTOGRAMME D'ECARTS TYPES LOCAUX DUQUEL EST ESTIME L'ECART TYPE DU BRUIT. CONCERNANT LES FILTRES, TROIS ALGORITHMES DE FILTRAGE DES TROIS TYPES DE BRUIT RETENUS SONT DECRITS. LE FILTRE DE BRUIT IMPULSIONNEL PROPOSE DETECTE LES PIXELS BRUITES PUIS APPLIQUE UN FILTRE PARTICULIER EN FONCTION DE LA CONFIGURATION LOCALE DU PIXEL BRUITE. LE FILTRE DE BRUIT ADDITIF UTILISE LE PRINCIPE DU FILTRE DE LEE POUR CORRIGER DE MANIERE RECURSIVE ET ITERATIVE, LES PIXELS DE VALEUR MINIMALE ET MAXIMALE DANS CHAQUE FENETRE D'ANALYSE. LE FILTRE DU BRUIT MULTIPLICATIF UTILISE UNE ADAPTATION DU FILTRE DE BRUIT ADDITIF APRES TRANSFORMATION DU MODELE DE L'OBSERVATION EN MODELE ADDITIF. LES PERFORMANCES DE CHAQUE PROCEDURE OU ALGORITHME SONT MESUREES SUR DES IMAGES DEGRADEES ARTIFICIELLEMENT ET SUR DES IMAGES DE TELEDETECTION
Download or read book Filtrage et restauration myopes des images num riques written by Luc Klaine and published by . This book was released on 2004 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les images numériques sont souvent dégradées par un flou et/ou un bruit lors de l'acquisition. L'objectif de cette thèse est de contribuer à un système adaptatif de restauration des images pour en faciliter l'exploitation. La première partie est un travail de synthèse sur les méthodes de filtrage (classiques, semi-automatiques) et de restauration (variationelles). Le contexte est myope car le bruit inconnu est supposé additif, multiplicatif ou impulsionnel. Le seconde partie reprend le schéma des méthodes semi-automatiques. La recherche des zones homogènes est optimisée à partir des critères d'évaluation de la méthode. Les statistiques locales sont intégrées pour améliorer l'identification de la nature du bruit et l'estimation de sa variance. Le filtrage est basé sur la resolution numérique d'une équation d'évolution, le filtre de Lee et des statistiques locales adaptatives. Les statistiques locales et l'optimisation de l'erreur quadratique moyenne sont reprises pour la restauration.
Download or read book MISE EN UVRE D UN FILTRE BIDIMENSIONNEL APPLIQUE A L IMAGERIE ETUDE DE LA STABILITE D UNE OPERATION DE DECONVOLUTION written by Christophe-Jean Dumont and published by . This book was released on 1993 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: CES TRAVAUX ONT RAPPORT AUX FILTRES DE TRAITEMENT DE L'IMAGE NUMERIQUE ET PLUS PRECISEMENT A L'ETUDE DE LA FAISABILITE DE LA MISE EN UVRE D'UN FILTRE BIDIMENSIONNEL. LE FILTRE A UNE STRUCTURE CASCADEE CONSTITUEE DE TROIS OPERATIONS QUI SONT LES OPERATIONS DE CONVOLUTION, DE FILTRAGE LINEAIRE OU NON LINEAIRE ET DE DECONVOLUTION RECURRENTE. IL PORTE LE NOM CONVOLUTION FILTERING AND RECURSIVE DECONVOLUTION. L'OPERATION DE DECONVOLUTION EST L'OPERATION INVERSE DE L'OPERATION DE CONVOLUTION DEPENDANT DE LA FORME CENTREE ET EN CROIX D'UN MASQUE DE CONVOLUTION. L'ETUDE A CONSISTE A MONTRER LA FAISABILITE DE LA MISE EN UVRE DU FILTRE C.F.R.D. CONSTRUIT PRINCIPALEMENT AVEC UN MASQUE DE CONVOLUTION LAPLACIEN. CE MASQUE REVELE, ENTRE AUTRE, DES INFORMATIONS LIEES A LA PRESENCE D'UN FLOU DANS UNE IMAGE. NOUS NOUS SOMMES INTERESSES AU COMPORTEMENT INSTABLE DE L'OPERATION DE DECONVOLUTION. L'INSTABILITE A ETE CARACTERISEE PAR L'APPLICATION DU THEOREME DE STABILITE BIDIMENSIONNELLE DE HUANG. LES CONDITIONS DE STABILITE, FONCTION DE COEFFICIENTS DU MASQUE DE CONVOLUTION NE MONTRENT PAS LA FAISABILITE DE LA MISE DU FILTRE C.F.R.D. POUR LE MASQUE LAPLACIEN. NOUS AVONS MIS EN UVRE UNE METHODE DE STABILISATION DE L'OPERATION DE DECONVOLUTION MAIS SEULEMENT APPLICABLE POUR LES MASQUES DE CONVOLUTION NE COMPORTANT PAS DE COMPOSANTES FREQUENTIELLES NULLES. CETTE CONDITION LIMITE LE CHOIX DES MASQUES DE CONVOLUTION ET NE PERMET PAS D'ENVISAGER UNE APPLICATION DU FILTRE C.F.R.D. AVEC UN MASQUE LAPLACIEN. LA METHODE A CEPENDANT ETE MISE EN UVRE POUR D'AUTRES MASQUES PROCHE DU LAPLACIEN, MAIS LES RESULTATS OBTENUS LORS D'UNE APPLICATION EN RESTAURATION D'IMAGES FLOUES ONT MONTRE LE FAIBLE INTERET DE LA FAISABILITE RESTREINTE DE LA MISE EN UVRE DU FILTRE C.F.R.D. LES PERSPECTIVES DE TRAVAIL S'ORIENTENT DONC VERS LA RECHERCHE D'UNE AUTRE METHODE DE STABILISATION APPLICABLE POUR TOUTE OPERATION DE DECONVOLUTION A L'ORIGINE INSTABLE
Download or read book Strat gies nationales d automatisation written by Centre d'études des systèmes et technologies avancées (France) and published by . This book was released on 1984 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computed Tomography written by Euclid Seeram and published by Saunders. This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiologic technologists play an important role in the care and management of patients undergoing advanced imaging procedures. This new edition provides the up-to-date information and thorough coverage you need to understand the physical principles of computed tomography (CT) and safely produce high-quality images. You'll gain valuable knowledge about the practice of CT scanning, effective communication with other medical personnel, and sectional anatomic images as they relate to CT. Features a chapter devoted to quality control testing of CT scanners (both spiral CT and conventional scan-and-stop), helping you achieve and maintain high quality control standards. Provides the latest information on: advances in volume CT scanning; CT fluoroscopy; multi-slice spiral/helical CT; and multi-slice applications such as 3-D imaging, CT angiography, and virtual reality imaging (endoscopy)--all with excellent coverage of state-of-the-art principles, instrumentation, clinical applications and quality control. Two new chapters cover recent developments and important principles of multislice CT and PET/CT, giving you in-depth coverage of these quickly emerging aspects of CT.
Download or read book New Technologies in Radiation Oncology written by Wolfgang C. Schlegel and published by Springer Science & Business Media. This book was released on 2006-01-27 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: - Summarizes the state of the art in the most relevant areas of medical physics and engineering applied to radiation oncology - Covers all relevant areas of the subject in detail, including 3D imaging and image processing, 3D treatment planning, modern treatment techniques, patient positioning, and aspects of verification and quality assurance - Conveys information in a readily understandable way that will appeal to professionals and students with a medical background as well as to newcomers to radiation oncology from the field of physics
Download or read book Digital Radiography written by Euclid Seeram and published by Cengage Learning. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital Radiography: An Introduction for Technologists, presents the physical principles and technical description of digital radiography imaging systems and associated technologies. This book functions as both a primary source for introductory digital imaging courses and as a reference for radiologic technologists and other imaging personnel. The book begins by exploring the many digital image acquisition imaging modalities such as computed radiography (CR), flat-panel digital radiography, digital fluoroscopy, and digital mammography systems in detail, followed by an outline of the essential elements of digital image processing. Associated technologies such as picture archiving and communication systems (PACS) and medical imaging informatics (MII) are also outlined. Finally, the book concludes with a description of quality control procedures for digital radiography.
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
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 Preservation of Archives in Tropical Climates written by René Teygeler and published by . This book was released on 2001 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Image Processing written by Gregory A. Baxes and published by Wiley. This book was released on 1994-09-15 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about state-of-the-art digital image processing without the complicated math and programming… You don’t have to be a preeminent computer scientist or engineer to get the most out of today’s digital image processing technology. Whether you’re working in medical imaging, machine vision, graphic arts, or just a hobbyist working at home, this book will get you up and running in no time, with all the technical know-how you need to perform sophisticated image processing operations. Designed for end users, as well as an introduction for system designers, developers, and technical managers, this book doesn’t bog you down in complex mathematical formulas or lines of programming code. Instead, in clear down-to-earth language supplemented with numerous example images and the ready-to-run digital image processing program on the enclosed disk, it schools you, step-by-step, in essential digital image processing concepts, principles, techniques, and technologies. Disk contains sample image files and a ready-to-run digital image processing program that lets you do as you learn detailed step-by-step guides to the most commonly used operations, including references to real-world applications and implementations hundreds of before and after images that help illustrate all the operations described comprehensive coverage of current hardware and the best methods for acquiring, displaying, and processing digital images
Download or read book Digital Music Videos written by Steven Shaviro and published by Rutgers University Press. This book was released on 2017-04-15 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Music videos today sample and rework a century’s worth of movies and other pop culture artifacts to offer a plethora of visions and sounds that we have never encountered before. As these videos have proliferated online, they have become more widely accessible than ever before. In Digital Music Videos, Steven Shaviro examines the ways that music videos interact with and change older media like movies and gallery art; the use of technologies like compositing, motion control, morphing software, and other digital special effects in order to create a new organization of time and space; how artists use music videos to project their personas; and how less well known musicians use music videos to extend their range and attract attention. Surveying a wide range of music videos, Shaviro highlights some of their most striking innovations while illustrating how these videos are creating a whole new digital world for the music industry.
Download or read book Monitoring soils in the environment with remote sensing and gis written by Richard Escadafal and published by IRD Orstom. This book was released on 1996 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISSS congress remote sensing
Download or read book Forest Landscape Management written by United States. Forest Service. Northern Region and published by . This book was released on 1972 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
