US 11,743,460 B2
Method and apparatus for encoding/decoding image information
Seungwook Park, Seoul (KR); Jaehyun Lim, Seoul (KR); Yongjoon Jeon, Seoul (KR); Chulkeun Kim, Seoul (KR); Jungsun Kim, Seoul (KR); Naeri Park, Seoul (KR); Hendry Hendry, Seoul (KR); Byeongmoon Jeon, Seoul (KR); and Joonyoung Park, Seoul (KR)
Assigned to LG Electronics Inc, Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Apr. 29, 2022, as Appl. No. 17/733,656.
Application 17/733,656 is a continuation of application No. 17/018,973, filed on Sep. 11, 2020, granted, now 11,350,090.
Application 17/018,973 is a continuation of application No. 16/443,243, filed on Jun. 17, 2019, granted, now 10,778,975, issued on Sep. 15, 2020.
Application 16/443,243 is a continuation of application No. 14/356,314, granted, now 10,326,988, issued on Jun. 18, 2019, previously published as PCT/KR2012/009248, filed on Nov. 5, 2012.
Claims priority of provisional application 61/569,291, filed on Dec. 12, 2011.
Claims priority of provisional application 61/558,398, filed on Nov. 10, 2011.
Claims priority of provisional application 61/555,495, filed on Nov. 4, 2011.
Prior Publication US 2022/0256147 A1, Aug. 11, 2022
Int. Cl. H04N 19/136 (2014.01); H04N 19/117 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/82 (2014.01); H04N 19/86 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/136 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/82 (2014.11); H04N 19/86 (2014.11)] 14 Claims
OG exemplary drawing
 
1. An image decoding method, by a decoding apparatus, the method comprising:
generating a reconstructed picture based on picture information obtained from a received bitstream; and
applying a deblocking filtering process and a sample adaptive offset (SAO) process on the reconstructed picture, wherein the SAO process is applied after completing the deblocking filtering process,
wherein applying the deblocking filtering process includes:
deriving a target boundary of a deblocking filtering unit block which is a unit block for which deblocking filtering is performed in the reconstructed picture;
setting a boundary strength (bS) of the target boundary in the reconstructed picture; and
applying deblocking filtering on the target boundary based on the bS,
wherein the bS is set to one of three values including 0, 1 and 2,
wherein the bS is set to 2 for a first case when at least one of two blocks which are adjacent the target boundary is coded with intra prediction mode, otherwise the bS is set to 1 for a second case when at least one of the two blocks includes a transform coefficient other than 0, otherwise the bS is set to 1 for a third case when the two blocks have different reference pictures or different motion vectors,
wherein the deblocking filtering unit block is an 8×8 pixel block,
wherein the target boundary for which the bS is set has 4 pixel length, and
wherein the applying deblocking filtering comprises:
determining whether the deblocking filtering is not to be applied on the target boundary when the set bS value is greater than 0 based on specific samples neighboring the target boundary and located in specific sample rows or columns, and
applying a strong filtering or a weak filtering on the target boundary when the deblocking filtering is determined to be applied on the target boundary.