US 12,425,599 B2
Method and apparatus for decoding image by using transform according to block size in image coding system
Sunmi Yoo, Seoul (KR); Jangwon Choi, Seoul (KR); and Jin Heo, Seoul (KR)
Assigned to VIVO MOBILE COMMUNICATION CO., LTD., Guangdong (CN)
Filed by VIVO MOBILE COMMUNICATION CO., LTD., Guangdong (CN)
Filed on Feb. 28, 2024, as Appl. No. 18/590,546.
Application 18/590,546 is a continuation of application No. 18/127,192, filed on Mar. 28, 2023, granted, now 11,949,875.
Application 18/127,192 is a continuation of application No. 17/514,113, filed on Oct. 29, 2021, granted, now 11,647,200, issued on May 9, 2023.
Application 17/514,113 is a continuation of application No. 16/853,484, filed on Apr. 20, 2020, granted, now 11,206,403.
Application 16/853,484 is a continuation of application No. PCT/KR2019/005206, filed on Apr. 30, 2019.
Claims priority of provisional application 62/666,100, filed on May 3, 2018.
Prior Publication US 2024/0283937 A1, Aug. 22, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/132 (2014.01); H04N 19/122 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/122 (2014.11); H04N 19/176 (2014.11); H04N 19/61 (2014.11)] 4 Claims
OG exemplary drawing
 
1. A method of an image decoding performed by a decoding apparatus, the method comprising:
obtaining prediction information for a current block from a bitstream;
obtaining a flag for whether transform coefficients for the current block are present;
deriving prediction samples by performing an intra prediction or an inter prediction for the current block based on the prediction information;
determining whether a value of the flag is 1 which indicates the transform coefficients for the current block are present;
after determining the value of the flag being 1, determining whether the current block is partitioned based on a width and a height of the current block and a maximum transform size;
deriving transform blocks by partitioning the current block after determining that the current block is partitioned based on the width and the height of the current block and the maximum transform size;
deriving the transform coefficients for the derived transform blocks;
deriving residual samples by performing an inverse transform process for the transform coefficients; and
generating a reconstructed picture based on the residual samples and the prediction samples,
wherein after determining the value of the flag being 1 and determining at least one of the width of the current block being greater than a width of the maximum transform size and the height of the current block being greater than a height of the maximum transform size, it is determined that the current block is partitioned into the transform blocks,
wherein the width of the current block is W and the height of the current block is H,
wherein after determining the width of the current block being greater than the width of the maximum transform size, a width of the transform blocks is derived as W/2, and
wherein after determining the height of the current block being greater than the height of the maximum transform size, a height of the transform blocks is derived as H/2.