Inter-prediction method and apparatus in image coding system

Abstract

An image decoding method carried out by a decoding apparatus according to the present invention comprises the steps of: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block on the basis of a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated on the basis of the scaled movement vector and location of the current block; and deriving a movement vector of the current block on the basis of the updated movement vector.