US 12,015,781 B2
Image encoding and decoding of chroma block using luma block
Anish Tamse, Suwon-si (KR); Woongil Choi, Suwon-si (KR); Minwoo Park, Suwon-si (KR); Seungsoo Jeong, Suwon-si (KR); Yinji Piao, Suwon-si (KR); Gahyun Ryu, Suwon-si (KR); Kiho Choi, Suwon-si (KR); Narae Choi, Suwon-si (KR); and Minsoo Park, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Oct. 27, 2022, as Appl. No. 17/975,001.
Application 17/975,001 is a continuation of application No. 17/271,087, granted, now 11,546,602, previously published as PCT/KR2019/010839, filed on Aug. 26, 2019.
Claims priority of provisional application 62/722,452, filed on Aug. 24, 2018.
Prior Publication US 2023/0055604 A1, Feb. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/137 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/513 (2014.01)
CPC H04N 19/137 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/513 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding method comprising:
obtaining a first motion vector for a first N×N luma sub-block in a coding unit;
obtaining a second motion vector for a second N×N luma sub-block in the coding unit, wherein the second N×N luma sub-block is on the right side of the first N×N luma sub-block;
determining a chroma motion vector using an averaged motion vector determined by averaging the first motion vector and the second motion vector; and
obtaining predicted samples for a N×N chroma sub-block, using the chroma motion vector and a reference picture, wherein the N×N chroma sub-block includes a first N/2×N chroma sub-block corresponding to the first N×N luma sub-block and a second N/2×N chroma sub-block corresponding to the second N×N luma sub-block,
wherein a chroma sub-sampling format of the image is 4:2:2.