US 11,991,362 B2
Method for coding image on basis of deblocking filtering, and apparatus therefor
Hyeongmoon Jang, Seoul (KR); Jaehyun Lim, Seoul (KR); and Junghak Nam, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Aug. 31, 2022, as Appl. No. 17/899,834.
Application 17/899,834 is a continuation of application No. 17/572,329, filed on Jan. 10, 2022, granted, now 11,470,325.
Application 17/572,329 is a continuation of application No. PCT/KR2020/008984, filed on Jul. 9, 2020.
Claims priority of provisional application 62/871,731, filed on Jul. 9, 2019.
Prior Publication US 2023/0007268 A1, Jan. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/132 (2014.01); H04N 19/117 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01); H04N 19/82 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/117 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11); H04N 19/82 (2014.11)] 11 Claims
OG exemplary drawing
 
1. A video decoding method performed by a decoding apparatus, the method comprising:
obtaining Block-based Delta Pulse Code Modulation (BDPCM) flag information from a bitstream;
deriving quantized transform coefficients for a current block based on the BDPCM flag information;
deriving residual samples for the current block by performing a dequantization for the quantized transform coefficients;
deriving prediction samples for the current block based on the BDPCM flag information;
generating a reconstructed picture based on the residual samples and the prediction samples;
deriving a boundary strength (bS) for a target boundary of the current block in the reconstructed picture;
determining whether deblocking filtering is applied to the target boundary based on the bS; and
performing the deblocking filtering on the reconstructed picture based on a result of the determination,
wherein the bS for the target boundary is derived based on the BDPCM flag information,
wherein a tree type of the current block is a single tree type, and the current block is a chroma coding block, and
wherein based on a value of the BDPCM flag information being 1, the bS for the target boundary of the chroma coding block is derived as 0.