US 12,348,722 B2
Method and apparatus for CABAC-based entropy coding
Junghak Nam, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on May 3, 2024, as Appl. No. 18/655,199.
Application 18/655,199 is a continuation of application No. 18/135,515, filed on Apr. 17, 2023, granted, now 12,003,726.
Application 18/135,515 is a continuation of application No. 18/125,358, filed on Mar. 23, 2023, granted, now 12,010,314.
Application 18/125,358 is a continuation of application No. 17/568,141, filed on Jan. 4, 2022, granted, now 11,665,349, issued on May 30, 2023.
Application 17/568,141 is a continuation of application No. 17/120,716, filed on Dec. 14, 2020, granted, now 11,330,267, issued on May 10, 2022.
Application 17/120,716 is a continuation of application No. PCT/KR2019/007213, filed on Jun. 14, 2019.
Claims priority of provisional application 62/692,887, filed on Jul. 2, 2018.
Claims priority of application No. 10-2018-0069073 (KR), filed on Jun. 15, 2018.
Prior Publication US 2024/0291990 A1, Aug. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/13 (2014.01); H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/20 (2014.01); H04N 19/46 (2014.01); H04N 19/463 (2014.01); H04N 19/70 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/13 (2014.11) [H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/70 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
deriving a context index for a split flag syntax element based on split availability information of a current block;
determining a context model based on the derived context index;
decoding a value of the split flag syntax element based on context-based adaptive binary arithmetic coding (CABAC) by using the determined context model;
deriving a current coding unit from the current block based on the value of the split flag syntax element;
deriving a predicted block based on inter-prediction or intra-prediction for the current coding unit; and
generating a reconstructed block based on the predicted block,
wherein the split flag syntax element comprises: a directional split flag representing whether the current block is to be vertically split,
wherein the split availability information comprises: a binary tree (BT) horizontal split available flag information related to whether the current block is allowed to be horizontally split based on a BT structure, a ternary tree (TT) horizontal split available flag information related to whether the current block is allowed to be horizontally split based on a TT structure, a BT vertical split available flag information related to whether the current block is allowed to be vertically split based on the BT structure, and a TT vertical split available flag information related to whether the current block is allowed to be vertically split based on the TT structure,
wherein the context index for the directional split flag is derived based on a first value and a second value,
wherein the first value is derived based on a value of the BT horizontal split available flag information and a value of the TT horizontal split available flag information, and
wherein the second value is derived based on a value of the BT vertical split available flag information and a value of the TT vertical split available flag information.