US 12,143,607 B2
Method and apparatus for signalling flags related to chroma transform blocks
Roman Igorevich Chernyak, Moscow (RU); Yin Zhao, Hangzhou (CN); Sergey Yurievich Ikonin, Moscow (RU); and Jianle Chen, San Diego, CA (US)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jun. 7, 2023, as Appl. No. 18/206,770.
Application 18/206,770 is a continuation of application No. 17/830,875, filed on Jun. 2, 2022, granted, now 11,716,479.
Application 17/830,875 is a continuation of application No. 17/368,502, filed on Jul. 6, 2021, granted, now 11,375,213, issued on Jun. 28, 2022.
Application 17/368,502 is a continuation of application No. PCT/RU2020/050033, filed on Mar. 2, 2020.
Claims priority of provisional application 62/825,005, filed on Mar. 27, 2019.
Claims priority of provisional application 62/817,498, filed on Mar. 12, 2019.
Claims priority of provisional application 62/812,282, filed on Mar. 1, 2019.
Claims priority of application No. PCT/EP2019/064224 (WO), filed on May 31, 2019.
Prior Publication US 2023/0353760 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 11/02 (2006.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/44 (2014.01); H04N 19/60 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/176 (2014.11); H04N 19/44 (2014.11); H04N 19/60 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a current transform unit or a current sub-transform unit within the current transform unit, wherein a first chroma transform block and a second chroma transform block relate to the current transform unit or the current sub-transform unit;
performing a first determination to determine whether the first chroma transform block includes at least one transform coefficient levels not equal to 0;
obtaining a first value of a first flag based on a first result of the first determination, wherein the first flag specifies whether the first chroma transform block includes at least one transform coefficient levels not equal to 0;
performing a second determination to determine whether the second chroma transform block includes at least one transform coefficient levels not equal to 0;
obtaining a second value of a second flag based on a second result of the second determination, wherein the second flag specifies whether the second chroma transform block includes at least one transform coefficient levels not equal to 0;
signalling the first value of the first flag and the second value of the second flag in a transform unit syntax;
obtaining a third value of a third flag that specifies whether a transform tree structure is present or not; and
signalling the third value of the third flag in a coding unit syntax, wherein the first value of the first flag, the second value of the second flag and the third value of the third flag are used to derive a fourth value of a fourth flag that specifies whether a luma transform block includes at least one transform coefficient levels not equal to 0.