Video compression using a signal transmission chain...

H - Electricity – 04 – N

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H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2193109

An MPEG-2 or other compressed video stream (CP) can be manipulated as separate information bus (IB) and coefficient (CP*) streams. The information bus stream (IB) contains motion vector information but also information derived from a previous decoding operation (14, 18) for use in a subsequent coding operation (22). Processing in the coefficient domain enables bit rate conversion without decoding to the pixel level and also simplifies the combination of MPEG layers.

On peut manipuler un train de signaux vidéo du type MPEG-2 ou un autre train (CP) de signaux vidéo comprimés sous forme de trains séparés: un train de bus d'information (IB) et un train de coefficients (CP*). Le train de bus d'information (IB) contient non seulement des informations relatives au vecteur de mouvement mais également des informations dérivées d'une précédente opération de décodage (14, 18) destinées à être utilisées dans une prochaine opération de codage (22). Le traitement dans le domaine des coefficients permet d'effectuer une conversion du débit binaire sans décodage au niveau du pixel et simplifie également la combinaison des couches MPEG-2.

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