US 12,143,600 B2
Image encoding method/device, image decoding method/device, and recording medium in which bitstream is stored
Yong Jo Ahn, Seoul (KR); and Ho Chan Ryu, Seoul (KR)
Assigned to Intellectual Discovery Co., Ltd., Seoul (KR)
Filed by Intellectual Discovery Co., Ltd., Seoul (KR)
Filed on Sep. 19, 2023, as Appl. No. 18/469,838.
Application 18/469,838 is a continuation of application No. 17/471,467, filed on Sep. 10, 2021, granted, now 11,812,033.
Application 17/471,467 is a continuation of application No. 16/968,942, granted, now 11,153,574, issued on Oct. 19, 2021, previously published as PCT/KR2019/002149, filed on Feb. 21, 2019.
Claims priority of application No. 10-2018-0021816 (KR), filed on Feb. 23, 2018.
Prior Publication US 2024/0015306 A1, Jan. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/105 (2014.01); H04N 19/139 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/159 (2014.11) [H04N 19/105 (2014.11); H04N 19/139 (2014.11); H04N 19/176 (2014.11)] 7 Claims
OG exemplary drawing
 
1. A method of decoding an image, comprising:
obtaining intra prediction information of a current block from a bitstream;
deriving an intra prediction mode of the current block based on the intra prediction information; and
performing intra prediction of the current block based on the intra prediction mode,
wherein deriving the intra prediction mode of the current block comprises:
deriving, based on the intra prediction information, an initial intra prediction mode of the current block from a plurality of intra prediction modes available for the current block;
determining whether to modify the initial intra prediction mode of the current block; and
deriving the intra prediction mode of the current block by applying one of pre-defined offsets to the initial intra prediction mode when it is determined to modify the initial intra prediction mode of the current block,
wherein in response to a case where the current block is a non-square block of which a width is greater than a height and the initial intra prediction mode belongs to a first range, the intra prediction mode is derived by applying a first offset of the pre-defined offsets to the initial intra prediction mode, and
wherein in response to a cases where the current block is a non-square block of which the width is smaller than the height and the initial prediction mode belongs to a second range, the intra prediction mode is derived by applying a second offset of the pre-defined offsets to the initial intra prediction mode.