Spatially scalable video coding facilitating the derivation...

H - Electricity – 04 – N

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H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/12 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/36 (2006.01) H04N 7/46 (2006.01) H04N 7/54 (2006.01)

Patent

CA 2096184

An adaptive technique for encoding and decoding which facilitates the transmission, reception, storage, or retrieval of a scalable video signal. The invention allows this scaling to be performed entirely in the spatial domain. In a specific embodiment of the invention this scaling is realized by adaptively encoding a video signal based upon a selection taken from among a multiplicity of predictions from previously decoded images, and a selection of compatible predictions obtained from up-sampling lower resolution decoded images of the current temporal reference. A technical advantage of the invention is that both the syntax and signal multiplexing structure of at least one encoded lower-resolution scale of video is compatible with the MPEG-1 standards.

L'invention est une méthode de codage et de décodage adaptative qui facilite la transmission, la réception, le stockage ou l'extraction de signaux vidéo à l'échelle. L'invention permet d'effectuer cette mise à l'échelle entièrement dans un domaine spatial. Dans une concrétisation particulière de l'invention, cette mise à l'échelle est réalisée en codant un signal vidéo adaptativement au moyen d'une prédiction sélectionnée parmi une multiplexité de prédictions obtenues d'images décodées antérieurement, et d'une sélection de prédictions compatibles obtenue en échantillonnant des images décodées de résolution inférieure à partir du signal de référence temporelle du moment. L'un des avantages de l'invention est que la syntaxe et la structure de multiplexage des signaux d'au moins une échelle codée de résolution inférieure des signaux vidéo est compatible avec la norme MPEG-1.

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