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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

FIG. 12 illustrates a quantization group that uses an index to select an entry in a table of chroma QP offset values. As discussed above, the quantization group 821 includes the coding tree unit 1100, which in turn includes a transform unit 1200. The transform unit 1200 is described in FIG. 12 by pseudo code modified from the H.265 pseudo code in order to accommodate additional chroma QP offsets.

The pseudo code for the transform unit 1200 is illustrated with darkened lines 1211-1214, which are added for the purpose of specifying the additional chroma QP offsets. Specifically, at line 1211, the parameter “additional_chroma_qp_offset” is used to indicate whether additional chroma information is allowed. The variable “IsCrCuQpOffsetCoded” is used to indicate whether it is necessary to specify (or receive) chroma QP offset information at the transform unit 1200. If the chroma QP offset values for the QG 821 have already been coded, there is no need to specify chroma QP offset values again. If the QG 821 has not already coded a set of chroma QP offset values (i.e., if the variable “IsCrCuQpOffsetCoded” is 0), the transform unit 1200 at lines 1212 specifies an index “cu_chroma_qp_offset_table_index” for selecting an entry from the table 890. For this example, the index value is set to select the chroma QP offset values contained in entry C (893) of the table 890.

權(quán)利要求

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