Download or read book Extraction de caract ristiques de texture pour la classification d images satellites written by Majdoulayne Hanifi and published by . This book was released on 2009 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse s'inscrit dans le cadre général du traitement des données multimédias. Nous avons plus particulièrement exploité les images satellitaires pour la mise en application de ces traitements. Nous nous sommes intéressés à l'extraction de variables et de caractéristiques texturelles ; nous avons proposé une nouvelle méthode de pré-traitement des textures afin d'améliorer l'extraction de ces attributs caractéristiques. L'augmentation de la résolution des satellites récents a, paradoxalement, perturbé les chercheurs lors des premières classifications sur des données à haute résolution. Les cartes très homogènes, obtenues jusqu'alors en moyenne résolution, devenaient très fragmentées et difficiles à utiliser avec les mêmes algorithmes de classification. Une façon de remédier à ce problème consiste à caractériser le pixel en cours de classification par des paramètres mesurant l'organisation spatiale des pixels de son voisinage. Il existe plusieurs approches à l'analyse de texture dans les images. Dans le cadre des images satellitaires, l'approche statistique semble être habituellement retenue, ainsi que les méthodes des matrices de cooccurrences et du corrélogramme, basées sur l'analyse statistique au deuxième ordre (au sens des probabilités sur des couples de pixels). Et ce sont les deux dernières méthodes sur lesquelles nous allons se baser pour en extraire l'information texturelle sous forme d'un vecteur. Ces matrices présentent des inconvénients, tels que la taille mémoire nécessaire et le temps de calcul des paramètres élevé. Pour contourner ce problème, nous avons cherché une méthode de réduction du nombre de niveaux de gris appelée codage de rang (permettant de passer, dans un premier temps de 256 niveaux à 9 niveaux de gris, puis ensuite pour améliorer la qualité de l'image, passer de 9 à 16 niveaux de gris), tout en conservant la structure et la texture de l'image. L'ensemble de cette thèse a donc permis de montrer que la méthode de codage est une meilleure façon pour compresser une image sans toutefois perdre de l'information texturelle. Il permet de réduire la taille des données, ce qui réduira le temps de calcul des caractéristiques.

Download or read book IGARSS written by and published by . This book was released on 1989 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book IGARSS 89 written by and published by . This book was released on 1989 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Feature Extraction and Classification Methods of Texture Images written by Ajay Kumar Singh and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: In texture classification the goal is to assign an unknown sample texture image to one of a set of known texture classes.Important applications include industrial and bio medical surface inspection, for example for defects and disease, ground classification and segmentation of satellite or aerial imagery, segmentation of textured regions in document analysis, and content-based access to image databases. However, despite many potential areas of application for texture analysis in industry there is only a limited number of successful examples. A major problem is that textures in the real world are often not uniform, due to changes in orientation, scale or other visual appearance. In addition, the degree of computational complexity of many of the proposed texture measures is very high.A wide variety of techniques for describing image texture have been proposed in literature. This work is an analysis of texture image classification in different classifier under two different features called wavelet and statistical. The result shows that image classification with wavelet feature and feed forward neural network gives better result.

Download or read book Digest written by and published by . This book was released on 1989 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Image Texture Analysis written by Chih-Cheng Hung and published by Springer. This book was released on 2019-06-05 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This useful textbook/reference presents an accessible primer on the fundamentals of image texture analysis, as well as an introduction to the K-views model for extracting and classifying image textures. Divided into three parts, the book opens with a review of existing models and algorithms for image texture analysis, before delving into the details of the K-views model. The work then concludes with a discussion of popular deep learning methods for image texture analysis. Topics and features: provides self-test exercises in every chapter; describes the basics of image texture, texture features, and image texture classification and segmentation; examines a selection of widely-used methods for measuring and extracting texture features, and various algorithms for texture classification; explains the concepts of dimensionality reduction and sparse representation; discusses view-based approaches to classifying images; introduces the template for the K-views algorithm, as well as a range of variants of this algorithm; reviews several neural network models for deep machine learning, and presents a specific focus on convolutional neural networks. This introductory text on image texture analysis is ideally suitable for senior undergraduate and first-year graduate students of computer science, who will benefit from the numerous clarifying examples provided throughout the work.

Download or read book Texture Feature Extraction Techniques for Image Recognition written by Jyotismita Chaki and published by Springer Nature. This book was released on 2019-10-24 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes various texture feature extraction approaches and texture analysis applications. It introduces and discusses the importance of texture features, and describes various types of texture features like statistical, structural, signal-processed and model-based. It also covers applications related to texture features, such as facial imaging. It is a valuable resource for machine vision researchers and practitioners in different application areas.

Download or read book Proceedings of the Canadian Symposium on Remote Sensing written by and published by . This book was released on 1989 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geomatica written by and published by . This book was released on 2005 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Remote Sensing written by and published by . This book was released on 1991 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book TRAITEMENT D IMAGES ET ANALYSE DE TEXTURES APPLICATION A L IMAGERIE SATELLITAIRE written by ABDELKRIM.. BEKKHOUCHA and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PRESENTE DE NOUVEAUX ALGORITHMES DANS DIFFERENTS DOMAINES DU TRAITEMENT D'IMAGES AVEC UNE APPLICATION A LA TELEDETECTION. LA PREMIERE PARTIE DE NOS TRAVAUX EST CONSACREE AUX METHODES DE PRETRAITEMENT: LISSAGE ET AMELIORATION DE CONTRASTE. LA METHODE DE LISSAGE PROPOSEE EST DE TYPE ADAPTATIVE ET EXPLOITE LES CARACTERISTIQUES LOCALES DU PIXEL TRAITE ET DE SON VOISINAGE. TROIS METHODES DE REHAUSSEMENT DE CONTRASTE SONT PROPOSEES EN VUE DE L'AMELIORATION DE L'ASPECT VISUEL. LA PREMIERE METHODE EST INSPIREE DES TECHNIQUES DE GORDON ET BEGHDADI. LES DEUX AUTRES REPOSENT SUR LES PRINCIPES DE DETECTION DE CONTOURS. CES METHODES ONT DONNE DES RESULTATS TRES SATISFAISANTS SUR TOUT TYPE D'IMAGES. ENSUITE EST DEVELOPPEE UNE TECHNIQUE D'EXTRACTION DE PRIMITIVES LINEAIRES SUR DES IMAGES SATELLITE, UTILISANT DES OPERATEURS DE MORPHOLOGIE MATHEMATIQUE POUR LA MISE EN EVIDENCE DU RESEAU URBAIN. L'IMAGE BINAIRE OBTENUE EST ALORS TRAITEE PAR UN ALGORITHME REALISANT: UNE SUPPRESSION DE PIXELS ISOLES, LE LISSAGE DES BORDS ET DES CONTOURS, UN AMINCISSEMENT DE PRIMITIVES, UN RACCORDEMENT DE CELLES-CI ET ENFIN UNE SUPPRESSION DE SEGMENTS COURTS. LES RESULTATS SUR LES IMAGES SATELLITES SONT ENCOURAGEANTS. LA TROISIEME PARTIE DE NOS TRAVAUX PRESENTE UNE METHODE DE CODAGE D'IMAGES SUR UN NOMBRE REDUIT DE NIVEAUX DE GRIS, CONSERVANT LES REGIONS CARACTERISTIQUES DE L'IMAGE. POUR CELA NOUS INTRODUISONS UNE NOUVELLE MATRICE DE LONGUEUR DE PLAGES DE NUANCES DE NIVEAUX DE GRIS CONSTRUITE SUR LA DEFINITION D'UNE RELATION D'HOMOGENEITE ENTRE PIXELS D'UNE MEME PLAGE. LES SEUILS DE CODAGE SONT ALORS DETERMINES A PARTIR DE LA REPRESENTATION DES PLAGES DE NIVEAUX DE GRIS CALCULEE SUR CETTE MATRICE. LA DERNIERE PARTIE EST CONSACREE A LA RESTAURATION MARKOVIENNE D'IMAGES. ELLE CONSIDERE L'IMAGE COMME LA REALISATION D'UN CHAMP DE PICKARD DONT LES PARAMETRES SONT ESTIMES EN EXPLOITANT LA STRUCTURE BIDIMENSIONNELLE DE L'IMAGE. CETTE METHODE A DONNE DE BONS RESULTATS SUR DES IMAGES DE SYNTHESE MAIS DETRUIT LES NOMBREUSES ET PETITES ENTITES DES IMAGES SATELLITE

Download or read book La T l d tection un Outil Pour la Mod lisation Et la Gestion Des Changements Environnementaux written by Association québécoise de télédétection. Congrès and published by [Sherbrooke, Québec] : Centre d'applications et de recherches en télédétection. This book was released on 1993 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Earth Resources written by and published by . This book was released on 1985 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International Aerospace Abstracts (IAA).

Download or read book NASA SP written by and published by . This book was released on 1962 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computers Control Information Theory written by and published by . This book was released on 1984 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1989-04 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1985 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: