US 11,917,143 B2
Adaptive loop filter-based video or image coding
Seethal Paluri, Seoul (KR); Jaehyun Lim, Seoul (KR); Seunghwan Kim, Seoul (KR); and Jie Zhao, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 17/600,012
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Mar. 19, 2020, PCT No. PCT/KR2020/003788
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/204419, PCT Pub. Date Oct. 8, 2020.
Claims priority of provisional application 62/829,018, filed on Apr. 3, 2019.
Prior Publication US 2022/0182620 A1, Jun. 9, 2022
Int. Cl. H04N 19/117 (2014.01); H04N 19/176 (2014.01); H04N 19/184 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/176 (2014.11); H04N 19/184 (2014.11)] 13 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information from a bitstream;
generating reconstructed samples of a current block based on the image information; and
performing an adaptive loop filter (ALF) on the reconstructed samples,
wherein the performing the ALF comprising:
deriving filter coefficients for the ALF; and
generating modified reconstructed samples based on the reconstructed samples and the filter coefficients,
wherein the image information comprises an adaptation parameter set (APS),
wherein the APS comprises ALF data,
wherein the filter coefficients are derived based on the ALF data,
wherein the image information comprises header information,
wherein the header information includes multiple ALF related APS ID syntax elements,
wherein the header information includes an ALF related APS IDs number syntax element,
wherein an ALF related APS IDs number is derived based on a value of the ALF related APS IDs number syntax element, and
wherein the multiple ALF related APS ID syntax elements as many as the ALF related APS IDs number are included in the header information.