Une nouvelle approche de la conception et de la simulation de la compression d'images SPIHT
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R�cemment, la compression d'images est devenue une pr�occupation majeure dans le domaine du traitement d'images. La compression d'images avec pertes est n�cessaire pour r�duire les besoins de stockage et am�liorer le taux de transfert des donn�es. L'une des meilleures techniques de compression d'images est la transformation en ondelettes. La transformation en ondelettes utilise une grande vari�t� d'ondelettes pour la d�composition des images. Les techniques de codage de pointe telles que EZW (Embedded Zero tree Wavelet), SPIHT (Set Partitioning In Hierarchical Trees) et WDR (Wavelet Difference Reduction) utilisent la transform�e en ondelettes comme base. Dans ma th�se, j'ai utilis� la transform�e en ondelettes discr�te pour am�liorer la qualit� de l'image avec une valeur PSNR (Peak Signal to Noise Ratio) �lev�e et le meilleur rapport de compression sur une vari�t� d'images de diff�rentes tailles. L'analyse a �t� effectu�e en termes de PSNR, de CR (taux de compression) obtenu et de temps n�cessaire � la d�composition et � la reconstruction. Les r�sultats ont prouv� que non seulement la valeur PSNR et le rapport de compression obtenus sont tr�s �lev�s, mais aussi que le temps d'ex�cution pris par MSPIHT (Modified Set Partitioning In Hierarchical Trees) est tr�s faible par rapport aux autres techniques.
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