FIELD: physics, video.
SUBSTANCE: invention relates to video encoding and decoding. An image decoding device includes: a reference picture comparing unit for determining whether a reference picture of a current block is equal to the reference picture of a candidate block from a plurality of candidate blocks, adjacent to the current block, and when the reference picture of the candidate block is not equal to the reference picture of the current block, for determining whether both the reference picture of the candidate block and the reference picture of the current block are long-term reference pictures; and a motion vector determiner for, when both the reference picture of the candidate block and the reference picture of the current block are long-term reference pictures, obtaining a spatial motion vector prediction candidate without scaling the motion vector of the candidate block, determining motion vector prediction of the current block from among motion vector prediction candidates comprising a spatial motion vector prediction candidate and generating a motion vector of the current block using motion vector prediction.
EFFECT: high efficiency of motion vector prediction processing.
28 dwg, 1 tbl
