Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
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Détail de l'indexation
M001396
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Ouvrages de la bibliothèque en indexation M001396
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Titre : Codage d'images fixes et animées à faible débit Type de document : texte imprimé Auteurs : Belkacemi, Said, Auteur ; Derras, B., Directeur de thèse Editeur : [S.l.] : [s.n.] Année de publication : 1996 Importance : 112 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Magister : Electronique : Alger, Ecole Nationale Polytechnique : 1996
Bibliogr. f. 85 - 93 . Annexe f. 94 - 112Langues : Français (fre) Mots-clés : Codage d'images ; Codage entropique ; CODEC Compression ; Débit ; B.T.C. ; J.P.E.G. ; Visiophonie Index. décimale : M001396 Résumé : Dans cette thèse nous nous sommes intéressés au problème de codage d'images fixes et animées de telle façon à avoir le maximum de compression pour une éventuelle transmission à faible débit. Pour le codage d'images fixes, deux méthodes ont été utilisées l'une appelée B.T.C. (Bloc Truncation Coding) où une binarisation s'effectue pour chaque bloc de la même image. A cette méthode très simple, il a été ajouté un module de codage entropique qui permet d'avoir un codage adaptatif et de réduire considérablement le débit. Dans une deuxième méthode nous avons utilisé la norme J.P.E.G. (Joint Photographic Expert Group) qui est un standard pour la compression d'images fixes. Le codage d'image animées a été réalisé à travers trois CODEC (système de Codage et Décodage); l'un basé sur le codage hybride et le second est à base du standard JPEG. Ce dernier a atteint, pour une qualité d'images acceptable un taux de bits d'environ de 0,1 bit/pixel/image. Un autre codec d'images animées a été aussi proposé, celui-ci code seulement les images impaires et le récepteur se chargera de reconstruire les images paires par une interpolation à partir des images reçues. Ce dernier codec a permit d'atteindre un taux de bit de 0,06 bits/pixel/image. Exigeant ainsi, pour notre séquence d'images au format QCIF (Quarter of Common Intermediate Format) et pour une fréquence de projection de 25 images/seconde, un débit de 37 Kbits/s seulement pour notre séquence. Pour une qualité d'images acceptable et un débit pareil, ce codec se voit très adapté pour un service de visiophonie. Codage d'images fixes et animées à faible débit [texte imprimé] / Belkacemi, Said, Auteur ; Derras, B., Directeur de thèse . - [S.l.] : [s.n.], 1996 . - 112 f. : ill. ; 30 cm.
Mémoire de Magister : Electronique : Alger, Ecole Nationale Polytechnique : 1996
Bibliogr. f. 85 - 93 . Annexe f. 94 - 112
Langues : Français (fre)
Mots-clés : Codage d'images ; Codage entropique ; CODEC Compression ; Débit ; B.T.C. ; J.P.E.G. ; Visiophonie Index. décimale : M001396 Résumé : Dans cette thèse nous nous sommes intéressés au problème de codage d'images fixes et animées de telle façon à avoir le maximum de compression pour une éventuelle transmission à faible débit. Pour le codage d'images fixes, deux méthodes ont été utilisées l'une appelée B.T.C. (Bloc Truncation Coding) où une binarisation s'effectue pour chaque bloc de la même image. A cette méthode très simple, il a été ajouté un module de codage entropique qui permet d'avoir un codage adaptatif et de réduire considérablement le débit. Dans une deuxième méthode nous avons utilisé la norme J.P.E.G. (Joint Photographic Expert Group) qui est un standard pour la compression d'images fixes. Le codage d'image animées a été réalisé à travers trois CODEC (système de Codage et Décodage); l'un basé sur le codage hybride et le second est à base du standard JPEG. Ce dernier a atteint, pour une qualité d'images acceptable un taux de bits d'environ de 0,1 bit/pixel/image. Un autre codec d'images animées a été aussi proposé, celui-ci code seulement les images impaires et le récepteur se chargera de reconstruire les images paires par une interpolation à partir des images reçues. Ce dernier codec a permit d'atteindre un taux de bit de 0,06 bits/pixel/image. Exigeant ainsi, pour notre séquence d'images au format QCIF (Quarter of Common Intermediate Format) et pour une fréquence de projection de 25 images/seconde, un débit de 37 Kbits/s seulement pour notre séquence. Pour une qualité d'images acceptable et un débit pareil, ce codec se voit très adapté pour un service de visiophonie. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité Spécialité Etat_Exemplaire M001396 M001396 Papier Bibliothèque centrale Mémoire de Magister Disponible Documents numériques
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