US 12,395,664 B2
Image encoding/decoding method using weighted prediction, and method for transmitting bitstream
Seethal Paluri, Seoul (KR); Seung Hwan Kim, Seoul (KR); and Jie Zhao, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jun. 7, 2024, as Appl. No. 18/737,886.
Application 18/737,886 is a continuation of application No. 18/209,926, filed on Jun. 14, 2023, granted, now 12,034,957.
Application 18/209,926 is a continuation of application No. 17/695,383, filed on Mar. 15, 2022, granted, now 11,716,483, issued on Aug. 1, 2023.
Application 17/695,383 is a continuation of application No. PCT/KR2020/012495, filed on Sep. 16, 2020.
Claims priority of provisional application 62/901,243, filed on Sep. 16, 2019.
Prior Publication US 2024/0333957 A1, Oct. 3, 2024
Int. Cl. H04N 11/02 (2006.01); H04N 19/169 (2014.01); H04N 19/176 (2014.01); H04N 19/503 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/503 (2014.11) [H04N 19/176 (2014.11); H04N 19/188 (2014.11); H04N 19/70 (2014.11)] 10 Claims
OG exemplary drawing
 
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
obtaining weight information related to a weight from a bitstream according to a weight parameter syntax structure, wherein the weight information includes first syntax elements and second syntax elements; and
decoding a current block by performing inter prediction based on the weight information,
wherein the decoding the current block comprises:
deriving prediction samples of the current block based on the weight information; and
decoding the current block based on residual samples of the current block and the prediction samples,
wherein the obtaining the weight information according to the weight parameter syntax structure comprises:
obtaining weight number information related to a number of the first syntax elements and a number of the second syntax elements obtained from the bitstream according to the weight parameter syntax structure; and
obtaining the first syntax elements and the second syntax elements from the weight parameter syntax structure based on the weight number information,
wherein the first syntax elements specify a difference of a weighting factor,
wherein the second syntax elements include a syntax element specifying an additive offset applied to a luma prediction value and a syntax element specifying a difference of an additive offset applied to a chroma prediction value,
wherein the weight number information is obtained from the bitstream according to the weight parameter syntax structure based on flag information obtained from the bitstream,
wherein the flag information specifies whether the weight number information is obtained from the bitstream by the weight parameter syntax structure.