Patent ID: 11917143
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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.