System comprising at least one encoder for coding a digital...

Details System comprising at least one encoder for coding a digital... System comprising at least one encoder for coding a digital...

H - Electricity

04

N

H04N 7/32 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2105807

Known systems based on layered video coding and video decoding code with inadequate efficiency because the new high-resolution picture is predicted by means of the switching means present in the system either on the basis of the preceding high-resolution picture or on the basis of the instantaneous low-resolution picture. According to the invention, designing the switching means for the adjustment of the ratio of the signal representing the preceding high-resolution picture and the signal representing the instantaneous low-resolution picture and for then adding both the adjusted signals achieves a gain of 3 dB in the prediction with the correct ratio, and this results in an improvement in the coding efficiency.

Les systèmes connus faisant appel au codage et au décodage vidéo à plusieurs couches codent avec une efficacité insuffisante parce que la prédiction de la nouvelle image à haute résolution se fait au moyen du dispositif de sélection présent dans le système, lequel utilise soit l'image haute résolution précédente, soit l'image à basse résolution instantanée. Cette invention montre que, si l'on conçoit un dispositif de sélection servant à ajuster le taux du signal associé à l'image haute résolution précédente et le taux du signal associé à l'image basse résolution instantanée, puis que l'on additionne ces deux signaux ajustés, on est en mesure d'obtenir un gain de 3 dB dans la prédiction du rapport exact, ce qui permet ainsi d'améliorer l'efficacité du codage.

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