US 12,137,218 B2
Method and device for effective video encoding/decoding via local lighting compensation
Gun Bang, Daejeon (KR); Hui Yong Kim, Daejeon (KR); Dong Gyu Sim, Seoul (KR); Seoung Jun Oh, Seongnam-si (KR); Sea Nae Park, Seoul (KR); Jun Taek Park, Seoul (KR); and Jong Seok Lee, Seoul (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed on Mar. 17, 2023, as Appl. No. 18/186,025.
Application 18/186,025 is a division of application No. 17/260,948, granted, now 11,632,546, previously published as PCT/KR2019/008908, filed on Jul. 18, 2019.
Claims priority of application No. 10-2018-0083641 (KR), filed on Jul. 18, 2018; and application No. 10-2018-0115944 (KR), filed on Sep. 28, 2018.
Prior Publication US 2023/0231999 A1, Jul. 20, 2023
Int. Cl. H04N 19/117 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/167 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/167 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 6 Claims
OG exemplary drawing
 
1. A method of decoding a video, the method comprising:
determining an intra-prediction mode of a current chroma block;
in response to the intra-prediction mode indicates intra-prediction between color components, deriving linear model parameters of the current chroma block; and
obtaining a prediction block of the current chroma block based on the linear model parameters and a reconstructed luma block corresponding to the current chroma block,
wherein the linear model parameters are derived based on a luma template region adjacent to the reconstructed luma block and a chroma template region adjacent to the current chroma block,
wherein down-sampled luma samples are obtained by applying a down-sampling filter to the luma template region,
wherein the linear model parameters are derived further based on a maximum luma reference value, a minimum luma reference value, a maximum chroma reference value and a minimum chroma reference value,
wherein the maximum luma reference value is obtained by using a maximum down-sampled luma sample in the luma template region, and the maximum chroma reference value is obtained by using a first chroma sample that has a position corresponding to the maximum down-sampled luma sample, and
wherein the minimum luma reference value is obtained by using a minimum down-sampled luma sample in the luma template region, and the minimum chroma reference value is obtained by using a second chroma sample that has a position corresponding to the minimum down-sampled luma sample.