Etude des techniques de compression des images fixes et amélioration de la résistance aux erreurs de transmission PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Etude des techniques de compression des images fixes et amélioration de la résistance aux erreurs de transmission PDF full book. Access full book title Etude des techniques de compression des images fixes et amélioration de la résistance aux erreurs de transmission by MOURAD.. ABDAT. Download full books in PDF and EPUB format.
Author: MOURAD.. ABDAT
Publisher:
ISBN:
Category :
Languages : fr
Pages : 236
Get Book Here
Book Description
LE TRAVAIL DECRIT DANS LE PRESENT MEMOIRE SE SITUE DANS LE CADRE DE LA NORMALISATION DES TECHNIQUES DE CODAGE ET DE COMPRESSION D'IMAGES. IL A POUR OBJET D'ETENDRE, DE COMPLETER ET D'AMELIORER LES ALGORITHMES UTILISES EN COMPRESSION D'IMAGES FIXES, DE NATURE PHOTOGRAPHIQUE. NOUS AVONS ETUDIE LA POSSIBILITE D'UTILISER JBIG POUR LE CODAGE SANS PERTES D'IMAGES PHOTOGRAPHIQUES. EN PRENANT UN CODAGE DE GRAY POUR REPRESENTER LES PIXELS, EN DECOMPOSANT L'IMAGE EN PLANS DE BITS ET EN APPLIQUANT JUDICIEUSEMENT JBIG, IL EST POSSIBLE D'ATTEINDRE DES TAUX DE COMPRESSION COMPARABLES A CEUX DU MODE SANS PERTES DE JPEG ET MEME MEILLEURS POUR CERTAINES IMAGES. CONCERNANT LA NORME JPEG, IL SEMBLE INTERESSANT DE COMPLETER L'EVENTAIL DES TECHNIQUES UTILISEES EN FAISANT APPEL AU CODAGE ENTROPIQUE AVEC MEMOIRE. AINSI, LE CODAGE LZW (LEMPEL-ZIV-WELCH) A ETE SUBSTITUE AU CODAGE DE HUFFMAN ET, EN CHOISISSANT CONVENABLEMENT LES PARAMETRES, EN FAISANT LES ADAPTATIONS CONVENABLES, ON ABOUTIT A UN TAUX DE COMPRESSION TRES VOISIN DE CELUI DE LA NORME AVEC UN LEGER AVANTAGE POUR CERTAINES IMAGES. POUR LA RESISTANCE AUX ERREURS DE TRANSMISSION DE JPEG, L'ANALYSE DU FORMAT DE TRANSFERT JPEG A CONDUIT A UNE CLASSIFICATION DES DONNEES TRANSMISES, SUIVANT LES CONSEQUENCES QUE LEUR ALTERATION PEUT AVOIR SUR LES IMAGES DECODEES, EN TROIS CLASSES: LES ENTETES DE TRAME ET DE BALAYAGE, LES DONNEES ENTROPIQUES ET LES DONNEES OPTIONNELLES. L'ESSENTIEL DES TRAVAUX A PORTE SUR LES DONNEES ENTROPIQUES, AVEC L'ANALYSE DETAILLEE DE L'EFFET DES ERREURS ET LA LIMITATION DE LEUR PROPAGATION PAR DES POINTS DE SYNCHRONISATION QUI PEUVENT ETRE INTRODUITS EN CONSERVANT LA NORME. ENFIN, LA DETECTION ET LE MASQUAGE DES BLOCS ERRONES ONT ETE ETUDIES EN ADAPTANT DES METHODES EXISTANTES, EN PROPOSANT DES AMELIORATIONS ET EN INTRODUISANT DES TECHNIQUES NOUVELLES EN PARTICULIER POUR LES TESTS DE NON-COHERENCE
Author: MOURAD.. ABDAT
Publisher:
ISBN:
Category :
Languages : fr
Pages : 236
Get Book Here
Book Description
LE TRAVAIL DECRIT DANS LE PRESENT MEMOIRE SE SITUE DANS LE CADRE DE LA NORMALISATION DES TECHNIQUES DE CODAGE ET DE COMPRESSION D'IMAGES. IL A POUR OBJET D'ETENDRE, DE COMPLETER ET D'AMELIORER LES ALGORITHMES UTILISES EN COMPRESSION D'IMAGES FIXES, DE NATURE PHOTOGRAPHIQUE. NOUS AVONS ETUDIE LA POSSIBILITE D'UTILISER JBIG POUR LE CODAGE SANS PERTES D'IMAGES PHOTOGRAPHIQUES. EN PRENANT UN CODAGE DE GRAY POUR REPRESENTER LES PIXELS, EN DECOMPOSANT L'IMAGE EN PLANS DE BITS ET EN APPLIQUANT JUDICIEUSEMENT JBIG, IL EST POSSIBLE D'ATTEINDRE DES TAUX DE COMPRESSION COMPARABLES A CEUX DU MODE SANS PERTES DE JPEG ET MEME MEILLEURS POUR CERTAINES IMAGES. CONCERNANT LA NORME JPEG, IL SEMBLE INTERESSANT DE COMPLETER L'EVENTAIL DES TECHNIQUES UTILISEES EN FAISANT APPEL AU CODAGE ENTROPIQUE AVEC MEMOIRE. AINSI, LE CODAGE LZW (LEMPEL-ZIV-WELCH) A ETE SUBSTITUE AU CODAGE DE HUFFMAN ET, EN CHOISISSANT CONVENABLEMENT LES PARAMETRES, EN FAISANT LES ADAPTATIONS CONVENABLES, ON ABOUTIT A UN TAUX DE COMPRESSION TRES VOISIN DE CELUI DE LA NORME AVEC UN LEGER AVANTAGE POUR CERTAINES IMAGES. POUR LA RESISTANCE AUX ERREURS DE TRANSMISSION DE JPEG, L'ANALYSE DU FORMAT DE TRANSFERT JPEG A CONDUIT A UNE CLASSIFICATION DES DONNEES TRANSMISES, SUIVANT LES CONSEQUENCES QUE LEUR ALTERATION PEUT AVOIR SUR LES IMAGES DECODEES, EN TROIS CLASSES: LES ENTETES DE TRAME ET DE BALAYAGE, LES DONNEES ENTROPIQUES ET LES DONNEES OPTIONNELLES. L'ESSENTIEL DES TRAVAUX A PORTE SUR LES DONNEES ENTROPIQUES, AVEC L'ANALYSE DETAILLEE DE L'EFFET DES ERREURS ET LA LIMITATION DE LEUR PROPAGATION PAR DES POINTS DE SYNCHRONISATION QUI PEUVENT ETRE INTRODUITS EN CONSERVANT LA NORME. ENFIN, LA DETECTION ET LE MASQUAGE DES BLOCS ERRONES ONT ETE ETUDIES EN ADAPTANT DES METHODES EXISTANTES, EN PROPOSANT DES AMELIORATIONS ET EN INTRODUISANT DES TECHNIQUES NOUVELLES EN PARTICULIER POUR LES TESTS DE NON-COHERENCE
Author: IEEE Industrial Electronics Society. Conference
Publisher:
ISBN:
Category : Automation
Languages : en
Pages : 708
Get Book Here
Book Description
Author: Aggelos Konstantinos Katsaggelos
Publisher: Springer Science & Business Media
ISBN: 9780792382980
Category : Computers
Languages : en
Pages : 328
Get Book Here
Book Description
Establishes a bridge between the fields of signal recovery and image and video compression, illustrating how techniques such as Bayesian estimation and the theory of projections onto convex sets can be brought to bear on problems in image and video compression and transmission. Addresses recovery of information which is lost due to the quantization process in compressing still images and video using available compression standards, demonstrating that established recovery techniques can be modified and used in these situations, and considers problems of recovery of information lost during the transmission process. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Madhuri A. Joshi
Publisher: CRC Press
ISBN: 1482228238
Category : Computers
Languages : en
Pages : 228
Get Book Here
Book Description
Image and video signals require large transmission bandwidth and storage, leading to high costs. The data must be compressed without a loss or with a small loss of quality. Thus, efficient image and video compression algorithms play a significant role in the storage and transmission of data.Image and Video Compression: Fundamentals, Techniques, and
Author: Weidong Kou
Publisher: Springer Science & Business Media
ISBN: 147572361X
Category : Computers
Languages : en
Pages : 201
Get Book Here
Book Description
Digital image business applications are expanding rapidly, driven by recent advances in the technology and breakthroughs in the price and performance of hardware and firmware. This ever increasing need for the storage and transmission of images has in turn driven the technology of image compression: image data rate reduction to save storage space and reduce transmission rate requirements. Digital image compression offers a solution to a variety of imaging applications that require a vast amount of data to represent the images, such as document imaging management systems, facsimile transmission, image archiving, remote sensing, medical imaging, entertainment, HDTV, broadcasting, education and video teleconferencing. Digital Image Compression: Algorithms and Standards introduces the reader to compression algorithms, including the CCITT facsimile standards T.4 and T.6, JBIG, CCITT H.261 and MPEG standards. The book provides comprehensive explanations of the principles and concepts of the algorithms, helping the readers' understanding and allowing them to use the standards in business, product development and R&D. Audience: A valuable reference for the graduate student, researcher and engineer. May also be used as a text for a course on the subject.
Author: Stephen T. Welstead
Publisher: SPIE Press
ISBN: 9780819435033
Category : Technology & Engineering
Languages : en
Pages : 264
Get Book Here
Book Description
Interest in image compression for internet and other multimedia applications has spurred research into compression techniques that will increase storage capabilities and transmission speed. This tutorial provides a practical guide to fractal and wavelet approaches--two techniques with exciting potential. It is intended for scientists, engineers, researchers, and students. It provides both introductory information and implementation details. Three Windows-compatible software systems are included so that readers can explore the new technologies in depth. Complete C/C++ source code is provided, enabling readers to go beyond the accompanying software. The mathematical presentation is accessible to advanced undergraduate or beginning graduate students in technical fields.
Author: K K Shukla
Publisher: Springer Science & Business Media
ISBN: 1447122186
Category : Computers
Languages : en
Pages : 98
Get Book Here
Book Description
Image compression is concerned with minimization of the number of information carrying units used to represent an image. Lossy compression techniques incur some loss of information which is usually imperceptible. In return for accepting this distortion, we obtain much higher compression ratios than is possible with lossless compression. Salient features of this book include: four new image compression algorithms and implementation of these algorithms; detailed discussion of fuzzy geometry measures and their application in image compression algorithms; new domain decomposition based algorithms using image quality measures and study of various quality measures for gray scale image compression; compression algorithms for different parallel architectures and evaluation of time complexity for encoding on all architectures; parallel implementation of image compression algorithms on a cluster in Parallel Virtual Machine (PVM) environment.
Author: Rohit M. Thanki
Publisher: Springer
ISBN: 3030125750
Category : Technology & Engineering
Languages : en
Pages : 107
Get Book Here
Book Description
This book introduces advanced and hybrid compression techniques specifically used for medical images. The book discusses conventional compression and compressive sensing (CS) theory based approaches that are designed and implemented using various image transforms, such as: Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT), Discrete Wavelet Transform (DWT), and Singular Value Decomposition (SVD) and greedy based recovery algorithm. The authors show how these techniques provide simulation results of various compression techniques for different types of medical images, such as MRI, CT, US, and x-ray images. Future research directions are provided for medical imaging science. The book will be a welcomed reference for engineers, clinicians, and research students working with medical image compression in the biomedical imaging field. Covers various algorithms for data compression and medical image compression; Provides simulation results of compression algorithms for different types of medical images; Provides study of compressive sensing theory for compression of medical images.
Author: ZIAD.. ALKACHOUH
Publisher:
ISBN:
Category :
Languages : fr
Pages : 152
Get Book Here
Book Description
LE TRAVAIL DECRIT PORTE SUR LES TECHNIQUES D'INTERPOLATION DE BLOCS DANS UNE IMAGE ET LEUR APPLICATION AU MASQUAGE DES ERREURS DE TRANSMISSION DANS LES IMAGES CODEES PAR BLOCS, AINSI QU'A LA COMPRESSION PAR SUPPRESSION DES BLOCS INTERPOLABLES A LA SORTIE DU DECODEUR. DANS LE PREMIER CHAPITRE, LES TECHNIQUES DE CODAGE DES IMAGES SONT PRESENTEES ET LES EFFETS DES ERREURS DE TRANSMISSION SONT EXAMINES. DANS LE CHAPITRE II, LES TECHNIQUES D'INTERPOLATION DE BLOCS DANS LES DOMAINES SPATIAL ET FREQUENTIEL SONT EXPLOREES ET LES PLUS INTERESSANTES SONT EVALUEES. LES PERFORMANCES DES TECHNIQUES OPERANT DANS LE DOMAINE SPATIAL SONT MEILLEURES QUE CELLES OPERANT DANS LE DOMAINE FREQUENTIEL, MAIS ELLES PRESENTENT UN EFFET DE LISSAGE EXCESSIF DES CONTOURS ET UNE COMPLEXITE GENERALE PLUS IMPORTANTE. L'APPORT ESSENTIEL DE LA THESE SE SITUE DANS LES CHAPITRES III ET IV. UNE NOUVELLE TECHNIQUE D'INTERPOLATION DE BLOCS, EST PROPOSEE DANS LE CHAPITRE III. ELLE EXPLOITE LES PROPRIETES DE LA DCT ET UTILISE LES PIXELS CONNUS A SES FRONTIERES. L'INTERPOLATION EST REALISEE PAR LA RESOLUTION D'UN SYSTEME DETERMINE D'EQUATIONS OU LES CONDITIONS D'UNE SOLUTION EXACTE SONT EXPLICITEES. CETTE TECHNIQUE NECESSITE AU MAXIMUM 8 MULTIPLICATIONS PAR PIXEL CALCULE, ELLE EST ADAPTEE A DES BLOCS DE FORMES CARREES OU RECTANGULAIRES ET DES CONTOURS OUVERTS OU FERMES. ELLE RESTITUE BIEN LES CONTOURS VERTICAUX ET HORIZONTAUX OU LEGEREMENT DEVIES. UNE EXTENSION A ETE ELABOREE POUR RESTITUER LES CONTOURS DIAGONAUX, DECRITE AU CHAPITRE IV. ELLE SE COMBINE AVEC LA TECHNIQUE DE BASE POUR FOURNIR UNE QUALITE VISUELLE ET UN RAPPORT PSNR NETTEMENT SUPERIEURS AUX APPROCHES EXISTANTES. LA TECHNIQUE D'INTERPOLATION DE BLOCS EST APPLIQUEE AU MASQUAGE DES ERREURS DE TRANSMISSION DANS LE CADRE DE LA NORME MPEG. ELLE EST COMBINEE AVEC UNE TECHNIQUE DE MASQUAGE PAR COMPENSATION DE MOUVEMENT POUR EXPLOITER LA CORRELATION TEMPORELLE DANS LES SEQUENCES. COMME IL FAUT DETECTER L'ERREUR POUR REALISER LE MASQUAGE, DES TECHNIQUES DE DETECTION DE BLOCS ERRONES ONT ETE ELABOREES, BASEES SUR LA COHERENCE DE LA SYNTAXE MPEG ET LA CORRELATION DANS LE FLUX. IL EN RESULTE UN DECODEUR MPEG INTRINSEQUEMENT RESISTANT AUX ERREURS DE TRANSMISSION, DECRIT DANS LE CHAPITRE V. ENFIN, L'APPLICATION DE LA TECHNIQUE D'INTERPOLATION A LA COMPRESSION D'IMAGE PEUT CONDUIRE A UNE REDUCTION DE DEBIT POUVANT ALLER JUSQU'A LA MOITIE. CETTE REDUCTION EST REALISEE PAR LA NON TRANSMISSION PAR LE CODEUR DES BLOCS INTERPOLABLES A LA SORTIE DU DECODEUR, DANS L'IMAGE RECONSTRUITE OU PRESENTANT DES DISTORSIONS TOLERABLES.
Author: Savitri Bevinakoppa
Publisher: Springer Science & Business Media
ISBN: 9780792383222
Category : Computers
Languages : en
Pages : 234
Get Book Here
Book Description
Still Image Compression on Parallel Computer Architectures investigates the application of parallel-processing techniques to digital image compression. Digital image compression is used to reduce the number of bits required to store an image in computer memory and/or transmit it over a communication link. Over the past decade advancements in technology have spawned many applications of digital imaging, such as photo videotex, desktop publishing, graphics arts, color facsimile, newspaper wire phototransmission and medical imaging. For many other contemporary applications, such as distributed multimedia systems, rapid transmission of images is necessary. Dollar cost as well as time cost of transmission and storage tend to be directly proportional to the volume of data. Therefore, application of digital image compression techniques becomes necessary to minimize costs. A number of digital image compression algorithms have been developed and standardized. With the success of these algorithms, research effort is now directed towards improving implementation techniques. The Joint Photographic Experts Group (JPEG) and Motion Photographic Experts Group(MPEG) are international organizations which have developed digital image compression standards. Hardware (VLSI chips) which implement the JPEG image compression algorithm are available. Such hardware is specific to image compression only and cannot be used for other image processing applications. A flexible means of implementing digital image compression algorithms is still required. An obvious method of processing different imaging applications on general purpose hardware platforms is to develop software implementations. JPEG uses an 8 × 8 block of image samples as the basic element for compression. These blocks are processed sequentially. There is always the possibility of having similar blocks in a given image. If similar blocks in an image are located, then repeated compression of these blocks is not necessary. By locating similar blocks in the image, the speed of compression can be increased and the size of the compressed image can be reduced. Based on this concept an enhancement to the JPEG algorithm is proposed, called Bock Comparator Technique (BCT). Still Image Compression on Parallel Computer Architectures is designed for advanced students and practitioners of computer science. This comprehensive reference provides a foundation for understanding digital image compression techniques and parallel computer architectures.
