, implémentation fournie en module complémentaire de la bibliothèque de développement QccPack 3 . La version sans codage arithmétique a ´ eté préférée, l'autre ne fournissant pas des résultats corrects. Les résultats seront présentés sous les noms de SPIHT-PQW, SPIHT-OQW et SPIHT-QHI. Son implémentation diffère légèrement de celle fournie par Said et Pearlman disponible en version exécutable uniquement. Les taux de compressionàcompressionà haut débit (sans perte ou presque) son légèrement moins bons, mais quasiment identiquesàidentiquesà bas débit, p.13
, il ressort que SPIHT-QHI fournit presque toujours les meilleurs résultats
, JPEG-LS, qui favorise l'encodage RLE, génère des trainées horizontales uniformes d'un pixel d'´ epaisseur. PQW réduit le nombre de niveaux de gris d'affichage et apporte donc un effet de tramage (transitions s` eches, contenu moins riche), 14 et 6.15)
, mais plus atténué, avec OQW qui restreint le nombre des niveaux de gris en quantifiant la bande basse fréquences. Enfin, QHI a tendancè a produire des images comportant une palette de niveaux de gris (histogramme) beaucoup plus importante et mieux répartie
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