US 11,659,163 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 INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY, Seoul (KR)
Appl. No. 17/285,336
Filed by INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY, Seoul (KR)
PCT Filed Dec. 11, 2019, PCT No. PCT/KR2019/017479
§ 371(c)(1), (2) Date Apr. 14, 2021,
PCT Pub. No. WO2020/130477, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10-2018-0163526 (KR), filed on Dec. 17, 2018.
Prior Publication US 2021/0385435 A1, Dec. 9, 2021
Int. Cl. H04N 19/159 (2014.01); H04N 19/105 (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)] 10 Claims
OG exemplary drawing
 
1. A video decoding method, comprising:
obtaining a flag from a bitstream, the flag indicating whether an intra prediction mode of a current block is derived from a first candidate group;
determining a candidate group for 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 the first candidate group, a second candidate group and a third 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 third candidate group is configured with remaining modes except for candidate modes of the first candidate group and the second candidate group among intra prediction modes available for 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 being 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, and
wherein in response to a mode value of the derived intra prediction mode being greater than a mode value of the DC mode, three reference lines of the reference region are available for the intra prediction of the current block.