Scalable video coding method and apparatus using pre-decoder

H - Electricity – 04 – N

Patent

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H04N 7/24 (2006.01)

Patent

CA 2536587

A method and an apparatus for controlling bitrates in an optimal manner by use of information available for use by the pre-decoder, in wavelet-based scalable video coding art using the pre-decoder. A method for controlling bitrates includes the steps of determining the amount of bits for each coding unit relative to a bitstream generated by encoding an original image so as to minimize distortion of the final image from the original image, and extracting a bitstream having the target amount of bits by truncating a part of the generated bitstream based on the determined amount of bits.

Cette invention se rapporte à un procédé et à un appareil permettant de commander des débits binaires de façon optimale grâce à l'utilisation d'une information disponible pour le pré-décodeur, dans le domaine du codage vidéo échelonnable à base d'ondelettes utilisant un pré-décodeur. Un procédé de commande de débits binaires consiste à déterminer la quantité de bits pour chaque unité de codage par rapport à un train de bits généré par codage d'une image originale, de façon à réduire au minimum la distorsion de l'image finale par rapport à l'image originale, et à extraire un train de bits ayant une quantité cible de bits par troncature d'une partie du train de bits généré sur la base de la quantité de bits déterminée.

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