IP Library › Granted Patent US 12,244,819
Granted Patent B2
US 12,244,819 · App. 17/694,305 · Granted Mar 4, 2025

Chroma quantization parameter in video coding

Inventors: Weijia Zhu (San Diego, CA); Li Zhang (San Diego, CA); Jizheng Xu (San Diego, CA)
Assignee: Bytedance Inc.
H04N19/14H04N19/117H04N19/124H04N19/132H04N19/174H04N19/176H04N19/186H04N19/196H04N19/70H04N19/86
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Quick Facts
Patent No.
US 12,244,819
App. No.
17/694,305
Granted
Mar 4, 2025
Kind
B2
Abstract

An example method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, whether to enable usage of a chroma quantization parameter (QP) offset for the current block according to a syntax element at a level of a video unit. The video unit includes the current block and a second block of the video. The method also includes performing the conversion based on the determining.

Claims (50)

1. A method of processing video data, comprising:

determining, for a conversion between a current block of a video and a bitstream of the video, whether to enable usage of a block level chroma quantization parameter offset for the current block according to a first enable flag cu_chroma_qp_offset_enabled_flag at a slice level, wherein the first enable flag indicates whether to enable usage of block level chroma quantization parameter offsets for blocks in a slice; and

performing the conversion based on the determining,

wherein whether the first enable flag is included in the bitstream at the slice level is based on a value of a second enable flag at a picture level that indicates whether block level chroma quantization parameter offsets are allowed,

wherein the second enable flag is included in a picture parameter set,

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are allowed, the first enable flag is included in the bitstream for indicating whether to enable usage of the block level chroma quantization parameter offset for the current block, and

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are disallowed, the first enable flag is not included in the bitstream.

2. The method of claim 1 , wherein in case the value of the second enable flag indicates that block level chroma quantization parameter offsets are not allowed, the first enable flag is omitted in the bitstream and the block level chroma quantization parameter offsets for blocks are determined to be disabled.

3. The method of claim 1 , wherein the usage of the block level chroma quantization parameter offset for the current block is determined based on at least one of the first enable flag or the second enable flag.

4. The method of claim 1 , wherein in response to the block level chroma quantization parameter offset for the current block being enabled, the block level chroma quantization parameter offset is used in at least one of a scaling process or a deblocking filter process in the conversion.

5. The method of claim 4 , wherein when the current block is a chroma block, the block level chroma quantization parameter offset is added to an output from a chroma quantization parameter table operation to determine parameters used in a decision process for a chroma block edge of the deblocking filter process.

6. The method of claim 1 , wherein the conversion includes encoding the video into the bitstream.

7. The method of claim 1 , wherein the conversion includes decoding the video from the bitstream.

8. An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

determine, for a conversion between a current block of a video and a bitstream of the video, whether to enable usage of a block level chroma quantization parameter offset for the current block according to a first enable flag cu_chroma_qp_offset_enabled_flag at a slice level, wherein the first enable flag indicates whether to enable usage of block level chroma quantization parameter offsets for blocks in a slice; and

perform the conversion based on the determining,

wherein whether the first enable flag is included in the bitstream at the slice level is based on a value of a second enable flag at a picture level that indicates whether block level chroma quantization parameter offsets are allowed,

wherein the second enable flag is included in a picture parameter set,

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are allowed, the first enable flag is included in the bitstream for indicating whether to enable usage of the block level chroma quantization parameter offset for the current block, and

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are disallowed, the first enable flag is not included in the bitstream.

9. The apparatus of claim 8 , wherein in case the value of the second enable flag indicates that block level chroma quantization parameter offsets are not allowed, the first enable flag is omitted in the bitstream and the block level chroma quantization parameter offsets for blocks are determined to be disabled; and

wherein the usage of the block level chroma quantization parameter offset for the current block is determined based on at least one of the first enable flag or the second enable flag.

10. The apparatus of claim 8 , wherein in response to the block level chroma quantization parameter offset for the current block being enabled, the block level chroma quantization parameter offset is used in at least one of a scaling process or a deblocking filter process in the conversion; and

wherein when the current block is a chroma block, the block level chroma quantization parameter offset is added to an output from a chroma quantization parameter table operation to determine parameters used in a decision process for a chroma block edge of the deblocking filter process.

11. A non-transitory computer-readable storage medium storing instructions that cause a processor to:

determine, for a conversion between a current block of a video and a bitstream of the video, whether to enable usage of a block level chroma quantization parameter offset for the current block according to a first enable flag cu_chroma_qp_offset_enabled_flag at a slice level, wherein the first enable flag indicates whether to enable usage of block level chroma quantization parameter offsets for blocks in a slice; and

perform the conversion based on the determining,

wherein whether the first enable flag is included in the bitstream at the slice level is based on a value of a second enable flag at a picture level that indicates whether block level chroma quantization parameter offsets are allowed,

wherein the second enable flag is included in a picture parameter set,

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are allowed, the first enable flag is included in the bitstream for indicating whether to enable usage of the block level chroma quantization parameter offset for the current block, and

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are disallowed, the first enable flag is not included in the bitstream.

12. The non-transitory computer-readable storage medium of claim 11 , wherein in case the value of the second enable flag indicates that block level chroma quantization parameter offsets are not allowed, the first enable flag is omitted in the bitstream and the block level chroma quantization parameter offsets for blocks are determined to be disabled; and

wherein the usage of the block level chroma quantization parameter offset for the current block is determined based on at least one of the first enable flag or the second enable flag.

13. The non-transitory computer-readable storage medium of claim 11 , wherein in response to the block level chroma quantization parameter offset for the current block being enabled, the block level chroma quantization parameter offset is used in at least one of a scaling process or a deblocking filter process in the conversion; and

wherein when the current block is a chroma block, the block level chroma quantization parameter offset is added to an output from a chroma quantization parameter table operation to determine parameters used in a decision process for a chroma block edge of the deblocking filter process.

14. A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

determining, for a current block of the video, whether to enable usage of a block level chroma quantization parameter offset for the current block according to a first enable flag cu_chroma_qp_offset_enabled_flag at a slice level, wherein the first enable flag indicates whether to enable usage of block level chroma quantization parameter offsets for blocks in a slice; and

generating the bitstream based on the determining,

wherein whether the first enable flag is included in the bitstream at the slice level is based on a value of a second enable flag at a picture level that indicates whether block level chroma quantization parameter offsets are allowed,

wherein the second enable flag is included in a picture parameter set,

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are allowed, the first enable flag is included in the bitstream for indicating whether to enable usage of the block level chroma quantization parameter offset for the current block, and

wherein in response to the value of the second enable flag indicating that block level chroma quantization parameter offsets are disallowed, the first enable flag is not included in the bitstream.

15. The non-transitory computer-readable recording medium of claim 14 , wherein in case the value of the second enable flag indicates that block level chroma quantization parameter offsets are not allowed, the first enable flag is omitted in the bitstream and the block level chroma quantization parameter offsets for blocks are determined to be disabled; and

wherein the usage of the block level chroma quantization parameter offset for the current block is determined based on at least one of the first enable flag or the second enable flag.

16. The non-transitory computer-readable recording medium of claim 14 , wherein in response to the block level chroma quantization parameter offset for the current block being enabled, the block level chroma quantization parameter offset is used in at least one of a scaling process or a deblocking filter process in the generating; and

wherein when the current block is a chroma block, the block level chroma quantization parameter offset is added to an output from a chroma quantization parameter table operation to determine parameters used in a decision process for a chroma block edge of the deblocking filter process.

17. The apparatus of claim 8 , wherein the conversion includes encoding the video into the bitstream.

18. The apparatus of claim 8 , wherein the conversion includes decoding the video from the bitstream.

19. The non-transitory computer-readable storage medium of claim 11 , wherein the conversion includes encoding the video into the bitstream.

20. The non-transitory computer-readable storage medium of claim 11 , wherein the conversion includes decoding the video from the bitstream.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 15, 2022
From: ZHU, WEIJIA; ZHANG, LI; XU, JIZHENG
To: BYTEDANCE INC.
Reel/Frame 059267/0015 →
Priority Claims (1)
WO PCT/CN2019/105831 · Sep 14, 2019 · international
Continuity (2)
Continuation PCTUS2020050649 · Sep 14, 2020
Related Publication 20220210448A1 · Jun 30, 2022
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