Picture coding device, picture coding method, picture...

Details Picture coding device, picture coding method, picture... Picture coding device, picture coding method, picture...

H - Electricity

04

N

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

Patent

CA 2255923

Efficient random access is made possible. A group of video plane (GOV) layer in which encoding start absolute time within accuracy of a second is arranged is provided as the layer of a coded bit stream. The GOV layer can be inserted not only at the head of the coded bit stream but at an arbitrary position in the coded bit stream. The display time of each video object plane (VOP) constituting the GOV layer is represented by modulo_time_base which represents absolute time in the unit of a second with the encoding start absolute time as standard and VOP_time_increment which represents in the unit of a millisecond the time that has elapsed since time (synchronization point) indicated by the modulo_time_base.

Pour mettre en oeuvre une mémoire à accès direct efficace, l'invention prévoit comme hiérarchie d'un train de bits codés une couche de "groupes de plans objets vidéo" (GOV) sur laquelle est établi un temps de début de codage absolu présentant une précision de l'ordre de la seconde. La couche de GOV peut être insérée non seulement à l'extrémité d'amorce du train de bits codés, mais également à d'autres positions arbitraires. De plus, un temps d'affichage de chaque "plan objet vidéo" (VOP) constituant le GOV est exprimé sous une forme modulo_time_base, qui exprime un temps relatif par rapport au temps de début de codage absolu en secondes; et sous une forme VOP_time_increment, qui exprime un temps écoulé à partir du temps (point de synchronisation) indiqué sous forme modulo_time_base en millisecondes.

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