Granted Patent B2

US 12,621,432 · App. 17/376,593 · Granted May 5, 2026

Inventors: Hongbin Liu (Beijing, CN); Li Zhang (San Diego, CA); Kai Zhang (San Diego, CA); Yue Wang (Beijing, CN)

Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.

H04N19/105H04N19/176H04N19/52H04N19/70

Abstract

Claims (45)

1 . A method of processing video data, comprising:

maintaining a history-based motion vector prediction (HMVP) table that includes entries that represent a past history of motion information used for a conversion between a current block of a video comprising video blocks and a bitstream of the video, wherein a local illumination compensation (LIC) flag is stored for each entry of the motion information and is stored together with the motion information in the HMVP table; and

performing the conversion of the current block based on the entries in the HMVP table,

wherein the LIC flag indicates a use of an LIC coding tool that uses a linear model of illumination changes for the conversion,

wherein the method further comprises:

comparing two candidate motion information using the LIC flag, and wherein the performing of the conversion is based on the comparing,

wherein the HMVP table is updated using the LIC flag, and

wherein in case that the current block is coded with an LIC coding mode, an updating of the HMVP table is skipped.

2 . The method of claim 1 , further comprising:

comparing two candidate motion information without using the LIC flag, and wherein the performing of the conversion is based on the comparing.

3 . The method of claim 1 , wherein a merge candidate from an entry in the HMVP table includes data associated with the LIC flag that is copied to the merge candidate.

4 . The method of claim 1 , wherein a default LIC flag value is set for each entry of the motion information.

5 . The method of claim 1 , wherein the current block coded with an LIC coding mode is used to update the HMVP table.

6 . The method of claim 1 , wherein entries with an enabled LIC coding mode are put in a motion candidate list to be before all or a part of entries with a disabled LIC coding mode.

7 . The method of claim 1 , wherein entries with a disabled LIC coding mode are put in a motion candidate list to be before all or a part of entries with an enabled LIC coding mode.

8 . The method of claim 1 , wherein different processes for maintaining the HMVP table are performed for a video block coded with a LIC coding mode and for a video block not coded with the LIC coding mode.

9 . The method of claim 1 , wherein the HMVP table is constructed in an order according to the local illumination compensation (LIC) flag associated with entry of the motion information and/or a type of the entry of the motion information.

10 . The method of claim 9 , wherein the type of the entry of the motion information is a merge candidate or an advanced motion vector prediction (AMVP) candidate.

11 . The method of claim 1 , wherein a motion candidate list for a video block coded with a LIC coding mode does not include an entry of the motion information derived from spatial or temporal neighboring or non-adjacent blocks that are not coded with the LIC coding mode or from HMVP candidates with an LIC flag equal to false.

12 . The method of claim 1 , wherein a motion candidate list for a video block not coded with a LIC coding mode does not include an entry of the motion information derived from spatial or temporal neighboring or non-adjacent blocks that are coded with the LIC coding mode or from HMVP candidates with an LIC flag equal to true.

13 . The method of claim 1 , wherein the conversion includes encoding the current block into the bitstream.

14 . The method of claim 1 , wherein the conversion includes decoding the current block from the bitstream.

15 . 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:

maintain a history-based motion vector prediction (HMVP) table that includes entries that represent a past history of motion information used for a conversion between a current block of a video comprising video blocks and a bitstream of the video, wherein a local illumination compensation (LIC) flag is stored for each entry of the motion information and is stored together with the motion information in the HMVP table; and

perform the conversion of the current block based on the entries in the HMVP table, wherein the LIC flag indicates a use of an LIC coding tool that uses a linear model of illumination changes for the conversion,

wherein the instructions upon execution by the processor further cause the processor to:

compare two candidate motion information using the LIC flag, and wherein the performing of the conversion is based on the comparing,

wherein the HMVP table is updated using the LIC flag, and

wherein in case that the current block is coded with an LIC coding mode, an updating of the HMVP table is skipped.

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

maintain a history-based motion vector prediction (HMVP) table that includes entries that represent a past history of motion information used for a conversion between a current block of a video comprising video blocks and a bitstream of the video, wherein a local illumination compensation (LIC) flag is stored for each entry of the motion information and is stored together with the motion information in the HMVP table; and

perform the conversion of the current block based on the entries in the HMVP table,

wherein the LIC flag indicates a use of an LIC coding tool that uses a linear model of illumination changes for the conversion,

wherein the instructions further cause the processor to:

compare two candidate motion information using the LIC flag, and wherein the performing of the conversion is based on the comparing,

wherein the HMVP table is updated using the LIC flag;

wherein in case that the current block is coded with an LIC coding mode, an updating of the HMVP table is skipped.

17 . 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:

maintaining a history-based motion vector prediction (HMVP) table that includes entries that represent a past history of motion information used for a current block of the video comprising video blocks, wherein a local illumination compensation (LIC) flag is stored for each entry of the motion information and is stored together with the motion information in the HMVP table; and

generating the bitstream based on the maintaining,

wherein the LIC flag indicates a use of an LIC coding tool that uses a linear model of illumination changes for the generating,

wherein the method further comprises:

comparing two candidate motion information using the LIC flag, and wherein the generating of the bitstream is based on the comparing,

wherein the HMVP table is updated using the LIC flag, and

wherein in case that the current block is coded with an LIC coding mode, an updating of the HMVP table is skipped.

Assignments (2)

Priority Claims (2)

Continuity (2)

References Cited (193)