US 12,341,956 B2
Image encoding and decoding method using adaptive alternative mode
Byeung Woo Jeon, Seongnam-si (KR); Bum Yoon Kim, Yongin-si (KR); Jee Yoon Park, Seoul (KR); and Seung Wook Park, Yongin-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, Suwon-si (KR)
Appl. No. 18/038,171
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, Suwon-si (KR)
PCT Filed Nov. 23, 2021, PCT No. PCT/KR2021/017285
§ 371(c)(1), (2) Date May 22, 2023,
PCT Pub. No. WO2022/108421, PCT Pub. Date May 27, 2022.
Claims priority of application No. 10-2020-0157794 (KR), filed on Nov. 23, 2020; and application No. 10-2021-0161970 (KR), filed on Nov. 23, 2021.
Prior Publication US 2024/0007620 A1, Jan. 4, 2024
Int. Cl. H04N 19/11 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/593 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A video decoding method for decoding a current block by using intra-prediction, the method comprising:
decoding related information on a chroma intra-prediction mode of the current block from a bitstream;
determining the chroma intra-prediction mode according to the related information from among a set of basic intra-prediction modes, an alternative mode, and a first luma intra-prediction mode corresponding to the current block;
generating a prediction block of the current block by using the chroma intra-prediction mode;
reconstructing a residual block of the current block from the bitstream; and
reconstructing the current block by adding the prediction block and the residual block,
wherein the alternative mode is adaptively derived based on information of neighboring blocks of the current block or information of corresponding luma area of the current block, and
wherein the alternative mode is used when the related information indicates one of basic intra-prediction modes other than the first luma intra-prediction mode and the indicated basic intra-prediction mode is equal to the first luma intra-prediction mode.