US 12,034,940 B2
Encoder, decoder, encoding method, and decoding method
Kiyofumi Abe, Osaka (JP); Takahiro Nishi, Nara (JP); Tadamasa Toma, Osaka (JP); Ryuichi Kanoh, Osaka (JP); Chong Soon Lim, Singapore (SG); Ru Ling Liao, Singapore (SG); Hai Wei Sun, Singapore (SG); Sughosh Pavan Shashidhar, Singapore (SG); Han Boon Teo, Singapore (SG); and Jing Ya Li, Singapore (SG)
Assigned to PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA, Torrance, CA (US)
Filed by Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed on Dec. 1, 2021, as Appl. No. 17/539,348.
Application 17/539,348 is a continuation of application No. 17/077,450, filed on Oct. 22, 2020, granted, now 11,223,835.
Application 17/077,450 is a continuation of application No. PCT/JP2019/016574, filed on Apr. 18, 2019.
Claims priority of provisional application 62/662,524, filed on Apr. 25, 2018.
Prior Publication US 2022/0094949 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/176 (2014.01); H04N 19/105 (2014.01); H04N 19/52 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/176 (2014.11) [H04N 19/105 (2014.11); H04N 19/52 (2014.11); H04N 19/70 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An encoding method comprising:
selecting a base motion vector from candidate motion vectors;
selecting a direction of a delta motion vector from four predetermined directions which differ from each other, the four predetermined directions including (i) a first direction, (ii) a second direction perpendicular to the first direction, (iii) a third direction perpendicular to the second direction, and (iv) a fourth direction perpendicular to the third direction;
determining a magnitude of the delta motion vector, the magnitude depending on precision of the delta motion vector;
writing an index into a bitstream, the index indicating the magnitude; and
modifying the base motion vector using the delta motion vector to encode a current block.