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Chroma quantization in video coding

專(zhuān)利號(hào)
US11659182B2
公開(kāi)日期
2023-05-23
申請(qǐng)人
Apple Inc.（US CA Cupertino）
發(fā)明人
Alexandros Tourapis; Guy Cote
IPC分類(lèi)
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(shuō)明書(shū)

The pseudo code for the picture header 900 is illustrated with darkened lines 911-917, which are added for the purpose of defining quantization groups for chroma QP offsets as well as encoding the table 890. Specifically, the parameter “additional_chroma_qp_offset” in line 911 informs the decoder that there will be additional chroma QP offset specifications for the picture 802, and the parameter “chroma_qp_offset_max_depth” in the line 913 defines the level (and hence the size or the hierarchical depth) for QGs in the picture 802. Lines 914-916 of the pseudo code then define a set of chroma QP offset values for each entry (891-895) of the table 890. As illustrated, each entry of the table is assigned a chroma QP offset value for a first component (“chroma_cmp0_qp_offset[k]”) and a chroma QP offset value for a second component (“chroma_cmp1_qp_offset[k]”).

Since the two chroma components for each entry of the chroma QP offset table are likely correlated, some embodiments use the chroma QP offset value of one chroma component to predict the chroma QP offset value of the other chroma component. In other words, for the k-th entry in the table, if chroma_cmp0_qp_offset[k] represents the offset value of the first chroma component and chroma_cmp1_qp_offset[k] represents the offset value of the second chroma component, then the chroma QP offset for the second chroma component of the k-th entry is computed as:
chroma_cmp1_qp_offset[k]=chroma_cmp0_qp_offset[k]+delta_chroma_cmp1_qp_offset[k]??(7)

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