Improved estimator for recovering high frequency components...

H - Electricity – 04 – N

Patent

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H04N 7/26 (2006.01) G06T 9/00 (2006.01)

Patent

CA 2275320

A method of compressing and decompressing digitally encoded data resulting in improved compression ratios is disclosed. The method utilizes the wavelet transform and the frequency response of human perception to determine which transform coefficients are important for perception. The method estimates the wavelet transform's discarded high frequency coefficients. At each level of the inverse transform, the method estimates the missing high frequency coefficients based on the complete set of low frequency coefficients and the filter coefficients. The resulting inverse wavelet transform is a high quality reproduction of the original image.

L'invention porte sur un procédé de compression/décompression de données codées numériquement permettant d'obtenir de meilleurs rapports de compression. Ledit procédé recourt à une transformée en ondelettes et à la réponse en fréquence de la perception humaine pour déterminer quels sont les coefficients importants pour la perception. Ledit procédé évalue les coefficients à haute fréquence rejetés par la transformée en ondelettes. Pour chacun des niveaux de la transformée inverse, le procédé évalue les coefficients à haute fréquence manquants en fonction du jeu complet des coefficients à basse fréquence et des coefficients de filtrage. La transformée en ondelettes inverse résultante constitue une reproduction de haute qualité de l'image originale.

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