US 11,924,414 B2
Image encoding/decoding method and device using intra prediction
Ki Baek Kim, Daejeon (KR)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed on Apr. 4, 2023, as Appl. No. 18/295,818.
Application 18/295,818 is a continuation of application No. 17/457,969, filed on Dec. 7, 2021, granted, now 11,652,988.
Application 17/457,969 is a continuation of application No. 17/042,432, granted, now 11,233,992, issued on Jan. 25, 2022, previously published as PCT/KR2019/003776, filed on Apr. 1, 2019.
Claims priority of application No. 10-2018-0037811 (KR), filed on Apr. 1, 2018.
Prior Publication US 2023/0239469 A1, Jul. 27, 2023
Int. Cl. H04N 19/11 (2014.01); H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/119 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/593 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method of decoding an image, comprising:
determining an intra prediction mode of a current block, wherein the intra prediction mode of the current block is determined for each of a luma block and a chroma block respectively, the intra prediction mode of the luma block is derived based on an MPM (Most Probable Mode) list and an MPM index, and the MPM list includes an intra prediction mode of a neighboring block (ModeA), ModeA+n, and ModeA−n; and
performing intra prediction on the current block based on the intra prediction mode,
wherein performing the intra prediction comprises:
specifying a luma region for inter-components reference of the chroma block;
performing down-sampling for the luma region;
deriving a parameter for the inter-components reference of the chroma block; and
predicting the chroma block based on the down-sampled luma region and the parameter,
wherein the luma region comprises a luma block and a neighboring region adjacent to the luma block, and performing down-sampling for the luma region comprises:
performing down-sampling for the neighboring region adjacent to the luma block based on:
pLeftDsY[y]=(pY[−2][2×y−1]+pY[−3][2×y]+4×pY[−2][2×y]+pY[−1][2×y]+pY[−2][2×y+1]+4)>>3.