US 11,722,690 B2
Motion vector generation device, a prediction image generation device, a video decoding device and a video coding device
Tomohiro Ikai, Sakai (JP); and Tomoyuki Yamamoto, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Sep. 13, 2021, as Appl. No. 17/473,576.
Application 17/473,576 is a continuation of application No. 16/076,278, granted, now 11,153,600, previously published as PCT/JP2017/003637, filed on Feb. 1, 2017.
Claims priority of application No. 2016-022248 (JP), filed on Feb. 8, 2016.
Prior Publication US 2021/0409757 A1, Dec. 30, 2021
Int. Cl. H04N 19/533 (2014.01); H04N 19/105 (2014.01); H04N 19/176 (2014.01); H04N 19/513 (2014.01)
CPC H04N 19/533 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/513 (2014.11)] 6 Claims
OG exemplary drawing
 
1. A motion vector generation device for generating a motion vector in a current picture, the motion vector generation device comprising:
merge candidate derivation circuitry that derives a first motion vector for a coding block by using (i) a motion vector of a neighboring block neighboring to the coding block and (ii) a merge index for the coding block; and
matching prediction parameter derivation circuitry that derives a second motion vector of each sub-blocks for the coding block by using the first motion vector,
wherein:
the second motion vector is searched by performing a second local search after performing a first local search for the sub-blocks by using the first motion vector and two reference pictures which are on different sides across the current picture,
a precision of the second local search is a higher precision than a precision of the first local search,
the second motion vector is derived by using a condition that a matching cost for a first block and a second block is minimum,
the first block is derived by using a first reference picture of the two reference pictures, and
the second block is derived by using a second reference picture of the two reference pictures.