US 12,335,490 B2
Image encoding/decoding method and device using IBC prediction, and method for transmitting bitstream
Hyeong Moon Jang, Seoul (KR); and Jung Hak Nam, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Jul. 1, 2024, as Appl. No. 18/760,491.
Application 18/760,491 is a continuation of application No. 17/438,003, granted, now 12,058,342, previously published as PCT/KR2020/003556, filed on Mar. 13, 2020.
Claims priority of provisional application 62/818,088, filed on Mar. 13, 2019.
Prior Publication US 2024/0357132 A1, Oct. 24, 2024
Int. Cl. H04N 19/105 (2014.01); H04N 19/119 (2014.01); H04N 19/137 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/159 (2014.11) [H04N 19/105 (2014.11); H04N 19/119 (2014.11); H04N 19/137 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/593 (2014.11)] 14 Claims
OG exemplary drawing
 
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
determining whether a prediction mode of a current block is an intra block copy (IBC) mode based on information on the prediction mode of the current block;
based on the prediction mode of the current block being an IBC mode, deriving motion information of the current block based on motion information of a corresponding block corresponding to the current block; and
generating a prediction block for the current block, by performing IBC prediction based on the derived motion information of the current block,
wherein, based on absence of motion information of the corresponding block, the motion information of the current block is derived based on default motion information, and
wherein the default motion information is derived based on motion information at a predetermined position of the corresponding block,
wherein the information on the prediction mode of the current block is obtained based on a flag specifying whether the IBC mode is enabled.