Patent ID: 9609318
Date: 2017-03-28
CPC Classifications: H04N

Claim:
1. A video encoding method using motion compensation of fractional-accuracy, the method comprising: a step of acquiring reference picture data designated by a motion vector and calculating edge information from the acquired reference picture data; a step of performing division of an encoding target frame into a plurality of regions that are units to which interpolation filters are adaptively applied, based on the edge information; a step of optimizing an interpolation filter for a fractional-accuracy pixel for each of the regions; and a step of interpolating the fractional-accuracy pixel of a reference picture using the optimized interpolation filter and performing predictive encoding using the motion compensation of fractional-accuracy, wherein the edge information is an edge angle extracted from the reference picture data designated by the motion vector and edge strength, and the division into the regions is performed depending on (a) whether or not the edge strength is higher than a threshold value and (b) if the edge strength is higher than the threshold value, a range of angles to which the edge angle belongs, the video encoding method further comprises a determining step of determining the threshold value based on a decoded picture obtained by performing decoding on an already encoded picture, and the determining step determines the threshold value in accordance with the number of the regions and an average value of previous edge strengths.