Coding dependency indication in scalable video coding

Abstract

A method of encoding and decoding a scalable video data stream comprising a base layer and at least one enhancement layer. encoding a scalable data stream, wherein the data stream comprises at least one non-essential picture at a temporal position of a layer, wherein the non-essential picture is not required for decoding a picture in an upper layer at said temporal position and following said temporal position in decoding order pictures; and signaling information of at least one non-essential picture in the scalable video data stream. In the decoding stage, the signaled information is decoded, and the time position and the layers above the non-essential picture are detected at the time position and following the time position in decoding order without decoding the non-essential picture. Picture decoding.

Description

technical field [0001] The present invention relates to scalable video coding and in particular to indicating coding dependencies in scalable video coding. Background technique [0002] Some video coding systems utilize scalable coding where some units or groups of units of a video sequence can be removed without affecting the reconstruction of other parts of the video sequence. Scalable video coding is a desirable feature for many multimedia applications and services used in systems utilizing decoders with a wide range of processing capabilities. Scalable bitstreams can eg be used for rate adaptation of precoded unicast streams in streaming servers and for sending a single bitstream to terminals with different capabilities and / or with different network conditions. [0003] Scalability is typically implemented by grouping image frames into hierarchical layers. The image frames encoded into the base layer image frames basically include only image frames necessary for decodi...

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