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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)

At 705, the process 700 processes parameters in picture header or PPS of the particular video picture. As discussed above by reference to FIG. 3, in some embodiments, the picture header or PPS of a video picture includes flags (e.g., “additional_chroma_qp_offset”) for determining whether additional chroma QP offsets are allowed for the video picture. The picture header or PPS also identifies the layer of the video hierarchy in which the chroma quantization groups for the additional chroma QP offsets will be defined (e.g., by setting the variable “chroma_qp_offset_max_depth”).

Next, the process identifies (at 710) 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.

The process then determines (at 720) whether additional chroma QP offsets are allowed or available for this particular video picture and/or slice. If additional chroma QP offsets are not available, the process proceeds to 750. If additional chroma QP offsets are available, the process proceeds to 730.

權(quán)利要求

1
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