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Apparatus, a method and a computer program for video coding and decoding

專利號
US11800131B2
公開日期
2023-10-24
申請人
NOKIA TECHNOLOGIES OY（FI Espoo）
發(fā)明人
Miska Matias Hannuksela; Kemal Ugur
IPC分類
H04N19/463; H04N19/70; H04N19/30; H04N19/61
技術(shù)領(lǐng)域
prediction,picture,bitstream,layer,pictures,syntax,coded,in,decoding,nal
地域： Espoo

摘要

A method comprising encoding a bitstream comprising a base layer, a first enhancement layer and a second enhancement layer; encoding an indication of both the base layer and the first enhancement layer used for prediction for the second enhancement layer in the bitstream; encoding, in the bitstream, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers, and encoding, in the bitstream, an indication of a second set of prediction types that is applicable from the base layer or the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers.

說明書

Referring back to the example of FIG. 7, it can be observed that the types of prediction between component pictures are pre-determined. Moreover, the reference for prediction is selected along pre-determined scalability identifiers. For example, inter-layer prediction is applied from a component picture having a lower value of dependency_id (compared to the dependency_id of the component picture being coded/decoded). For example, the top-right component picture in FIG. 7, i.e. the spatial enhancement of the depth picture on view 1, could have motion prediction either from the respective texture/sample picture, i.e. the spatial enhancement of the texture picture on view 1, or the base layer depth picture, i.e. the base layer depth picture on view 1.

It can be assumed that when multiple types of scalability and/or multiple references for the same type of prediction were enabled by the (de)coding scheme, compression improvement could be achieved when the prediction reference could be adaptively selected. Therefore, there is a need for mechanisms for adaptively selecting and/or signaling the type of prediction applied in a multi-reference scalable (de)coding scheme.

In the following, term layer is used in context of any type of scalability, including view scalability and depth enhancements. An enhancement layer refers to any type of an enhancement, such as SNR, spatial, multiview, depth, bit-depth, chroma format, and/or color gamut enhancement. A base layer also refers to any type of a base operation point, such as a base view, a base layer for SNR/spatial scalability, or a texture base view for depth-enhanced video coding.

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