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Chroma quantization in video coding

專利號
US11659182B2
公開日期
2023-05-23
申請人
Apple Inc.（US CA Cupertino）
發(fā)明人
Alexandros Tourapis; Guy Cote
IPC分類
H04N19/124; H04N19/30; H04N19/70; H04N19/126; H04N19/186; H04N19/157; H04N19/86; H04N19/136; H04N19/13; H04N19/15; H04N19/159; H04N19/51; H04N19/61; H04N19/96; H04N19/172; H04N19/176
技術(shù)領(lǐng)域
chroma,qp,offset,luma,qg,offsets,picture,values,coding,qgs
地域： CA CA Cupertino

摘要

A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.

說明書

In some embodiments, chroma quantization groups (chroma QGs) are defined in addition to luma quantization groups (luma QGs). A luma QG also encompasses one or more video data units, but is for specifying luma quantization parameters (luma QPs). In some embodiments, chroma QGs may overlap or encompass one or more luma QGs. In other words, different regions within a chroma QG may belong to different luma QGs and consequently have different luma QPs.

For some embodiments of the invention, FIG. 1 illustrates a hierarchical video coding structure 100 that includes chroma quantization groups (chroma QGs) with each having its own set of chroma QP offset specifications. The hierarchical video coding structure 100 includes several pictures 101-103. Among these, the picture 102 includes several slices 111-113. The slice 112 includes several chroma QGs 121-123. The picture 102 has a picture parameter set (PPS) 132 that includes a set of chroma QP offset specifications. The chroma QGs 121-123 are associated with chroma QP offset sets 141-143, respectively.

權(quán)利要求

1
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