Patent AU-2020294318-B2 (AU)
Title: Predictive encoding method, predictive encoding device, and predictive encoding program of motion vector, and, predictive decoding method, predictive decoding device, and predictive decoding program of motion vector
Inventor: FUJIBAYASHI AKIRA
IPC: H04N19/61
Filed: 2020-12-24
Granted: 2022-01-27
Abstract: PREDICTIVE ENCODING METHOD, PREDICTIVE ENCODING DEVICE, AND 
PREDICTIVE ENCODING PROGRAM OF MOTION VECTOR, AND, PREDICTIVE 
DECODING METHOD, PREDICTIVE DECODING DEVICE, AND PREDICTIVE 
DECODING PROGRAM OF MOTION VECTOR 
ABSTRACT 
A device and method for predictively decoding a motion vector used in motion compensated prediction to 
restore a video sequence consisting of a temporal sequence of frame pictures. In one aspect, the method 
comprises: a step of determining a first motion vector predictor candidate that satisfies a predetermined 
criterion used in determination ofmotion vector predictor candidates, from a motion vector or motion vectors 
of more partitions belonging to a left-neighboring region located on the left side of a target partition in a 
frame picture ofa decoding target; a step of determining a second motion vector predictor candidate satisfying 
a predetermined criterion used in determination of motion vector predictor candidates, from a motion vector 
or motion vectors of more partitions belonging to an above-neighboring region located above the target 
partition; a step of decoding encoded data to restore motion vector predictor indication information specifying 
an optimum motion vector predictor for the target partition; and a step of selecting the optimum motion vector 
predictor specified by the motion vector predictor indication information, from one or more motion vector 
predictor candidates including at least the first motion vector predictor candidate and the second motion 
vector predictor candidate, wherein the left-neighboring region includes a neighboring partition located 
below and on the left side ofthe target partition, wherein the above-neighboring region includes a neighboring 
partition located above and on the right side of the target partition, wherein the above-neighboring region 
includes a neighboring partition located above and on the left side of the target partition, characterized in that 
the step of determining the first motion vector predictor candidate comprises scanning more partitions 
included in the left-neighboring region, in an upward direction from a bottom of the left-neighboring region, 
and thereby determining, as the first motion vector predictor candidate, a motion vector satisfying the 
predetermined criterion used for determination ofmotion vector predictor candidates, from the motion vector 
or motion vectors of the more partitions belonging to the left-neighboring region, in that the step of 
determining the second motion vector predictor candidate comprises scanning more partitions included in 
the above-neighboring region, in a direction from right to left, and thereby determining, as the second motion 
vector predictor candidate, a motion vector satisfying the predetermined criterion used for determination of 
motion vector predictor candidate, from the motion vector or motion vectors ofthe more partitions belonging 
to the above-neighboring region; wherein a predicted signal of the target partition is generated by referring to 
a reference frame with a frame number specified by a reference picture list identification and a reference 
picture identification, wherein the step of determining the first motion vector predictor candidate comprises 
determining the first motion vector predictor candidate from motion vectors of partitions in the left
neighboring region having a reference picture list identification and a reference picture identification 
coincident with the reference picture list identification and/or the reference picture identification for the target 
partition, and wherein the step of determining the second motion vector predictor candidate comprises 
determining the second motion vector predictor candidate from motion vectors of partitions in the above
neighboring region having a reference picture list identification and a reference picture identification 
coincident with the reference picture list identification and/or the reference picture identification for the target 
partition.
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Fig.3 
START 
INPUT REFERENCE PICTURE LIST 
IDENTIFICATION (ref list) AND REFERENCE S301 
PICTURE IDENTIFICATION (refidx) 
DETECT MOTION VECTOR PREDICTOR 
CANDIDATE PMV1 S302 
FROM LEFT-NEIGHBORING REGION 
DETECT MOTION VECTOR PREDICTOR 
CANDIDATE PMV2 S303 
FROM ABOVE-NEIGHBORING REGION 
DETECT MOTION VECTOR PREDICTOR 
CANDIDATE PMV3 
DETERMINE MOTION VECTOR S305 
PREDICTOR CANDIDATES 
DETERMINE OPTIMUM 
MOTION VECTOR PREDICTOR S306 
PREFORM ENCODING S307 
END