US 12,483,690 B2
Video encoding/decoding method and device
Jong Ki Han, Seoul (KR); Sang Guk Cha, Seoul (KR); Geon Won Lee, Seoul (KR); and Geun Bae Kim, Incheon (KR)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
Filed on Mar. 28, 2023, as Appl. No. 18/191,375.
Application 18/191,375 is a division of application No. 17/285,336, granted, now 11,659,163, previously published as PCT/KR2019/017479, filed on Dec. 11, 2019.
Claims priority of application No. 10-2018-0163526 (KR), filed on Dec. 17, 2018.
Prior Publication US 2023/0231993 A1, Jul. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11)] 9 Claims
OG exemplary drawing
 
1. A video decoding method, comprising:
obtaining a flag from a bitstream,
wherein the flag indicates a candidate group used to derive an intra prediction mode of a current block;
determining, based on the flag, the candidate group for deriving the intra prediction mode of the current block among a plurality of candidate groups based on the flag;
deriving the intra prediction mode of the current block based on the determined candidate group; and
performing intra prediction for the current block based on the derived intra prediction mode and a reference region,
wherein the plurality of the candidate groups includes a first candidate group and a second candidate group,
wherein the first candidate group is configured with only one default mode,
wherein the second candidate group is configured by using an intra prediction mode of a neighboring block adjacent to the current block,
wherein the default mode is representative of one of a DC mode or a Planar mode,
wherein the default mode belonging to the first candidate group is not included in the second candidate group,
wherein in response to a mode value of the derived intra prediction mode is less than a mode value of the DC mode, one reference line of the reference region is available for the intra prediction of the current block,
wherein in response to a mode value of the derived intra prediction mode is greater than the mode value of the DC mode, three reference lines of the reference region are available for the intra prediction of the current block, and
wherein the neighboring block includes a left neighboring block of the current block.