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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

For some embodiments, FIG. 13 conceptually illustrates a process 1300 for determining chroma QP values from a video bitstream that uses a table of possible chroma QP offset values to implement additional chroma QP offset specifications. In some embodiments, the process 1300 is performed by a video decoder, which uses this process to perform de-quantization of chroma components when decoding the video bitstream for display or other purposes. In some embodiments, the process 1300 starts when the decoder has received a video bitstream and starts to decode a particular video picture in some embodiments.

At 1305, the process 1300 processes parameters in picture header or PPS of the particular video picture. In some embodiments, picture header includes flags for determining whether additional chroma QP offsets are allowed for the video picture. The picture header also includes parameters for identifying the layer of the video hierarchy in which the quantization groups for the additional chroma QP offsets will be defined.

Next, the process identifies (at 1310) higher level chroma QP offset values. In some embodiments, this higher level chroma QP offset values are picture level offsets encoded in the picture header (or as a part of the PPS). In some embodiments, this higher level chroma QP offset values are slice level offsets encoded in the slice header. Some embodiments identify multiple higher level chroma QP offset values, including both picture level and slice level.

權(quán)利要求

1
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