US 12,445,638 B2
Image coding method based on POC information and non-reference picture flag in video or image coding system
Hendry Hendry, Seoul (KR); Hyeongmoon Jang, Seoul (KR); Junghak Nam, Seoul (KR); Seunghwan Kim, Seoul (KR); and Jaehyun Lim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 17/791,062
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed May 24, 2021, PCT No. PCT/KR2021/006430
§ 371(c)(1), (2) Date Jul. 6, 2022,
PCT Pub. No. WO2021/241963, PCT Pub. Date Dec. 2, 2021.
Claims priority of provisional application 63/030,853, filed on May 27, 2020.
Prior Publication US 2023/0113358 A1, Apr. 13, 2023
Int. Cl. H04N 19/503 (2014.01); H04N 19/169 (2014.01); H04N 19/172 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/503 (2014.11) [H04N 19/172 (2014.11); H04N 19/188 (2014.11); H04N 19/46 (2014.11)] 15 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information through a bitstream, wherein the image information includes picture order count (POC) information, and a non-reference picture flag related to whether a picture is not used as a reference picture;
deriving a POC value of a current picture based on the POC information;
deriving a POC value of at least one reference picture based on the POC value of the current picture;
deriving a reference picture list for the current picture based on the POC value of the at least one reference picture;
performing an inter prediction on the current picture based on the reference picture list; and
generating a reconstructed picture for the current picture based on the result of the inter prediction,
wherein the POC information includes POC information of a previous picture in decoding order for the current picture, and the POC value of the current picture is derived based on a POC value of the previous picture in decoding order,
wherein the previous picture in decoding order for deriving the POC value of the current picture is limited to a picture in which a value of the non-reference picture flag is 0, and
wherein a POC difference value between the current picture and the previous picture in decoding order for deriving the POC value of the current picture is less than half of MaxPicOrderCntLsb, which is a predetermined maximum value of POC LSB.