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Compression Progressive d'Images Par Une Transformation Hybride

Compression Progressive d'Images Par Une Transformation Hybride

          
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About the Book

La compression d'images est d'un grand intérèt, surtout pour réduire la quantité de mémoire pour son stockage et réduire le temps de sa transmission. Les ondelettes ont souvent été utilisées de manière séparable. Il en résulte une décorrélation partielle de l'image. D'autre part, elles manquent des caractéristiques directionnelles pour l'image. Dans ce contexte, nous avons proposé un algorithme de compression utilisant une transformation hybride DCT - DWT. Dans cette méthode hybride, la transformée en ondelettes pour les échelles les plus fines a été remplacée par une transformée en cosinus discrète sous bandes, quand la transformée en ondelettes est utilisée pour les échelles grossiers. Dans une deuxième partie, une version améliorée de l'algorithme de codage SPIHT a été proposée. Basant sur l'estimation des résidus des coefficients codés, la valeur moyenne est codée la fin du code obtenu par le codage SPIHT. Pendant la décompression, l'algorithme de décodage utilise la valeur déjà codée pour l'ajustement des coefficients significatifs reconstitués. Les résultats obtenus montrent l'efficacité des approches proposées en termes de la qualité objective et subjective.


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Product Details
  • ISBN-13: 9783838189147
  • Publisher: Academiques
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 8 mm
  • Width: 152 mm
  • ISBN-10: 3838189140
  • Publisher Date: 28 Feb 2018
  • Height: 229 mm
  • No of Pages: 132
  • Series Title: Omn.Pres.Franc.
  • Weight: 204 gr


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