Video signal processing method and apparatus using subblock-based motion compensation

摘要

A video signal processing method and apparatus for encoding or decoding a video signal are disclosed. Specifically, a method for processing a video signal, the method comprising: obtaining a first syntax element indicating whether a subblock-based merge mode is applied to a current block; When the first syntax element indicates that the subblock-based merge mode is not applied to the current block, obtaining a second syntax element indicating whether a merge mode using a motion vector difference is applied to the current block. ; When the second syntax element indicates that the merge mode using the motion vector difference is applied to the current block, indicating a candidate used for inter prediction of the current block among candidates included in the merge candidate list of the current block Obtaining a third syntax element; Obtaining information related to the motion vector difference; Deriving a motion vector of the current block by adding the motion vector difference to a motion vector of a candidate indicated by the third syntax element; And generating a prediction block of the current block by using the motion vector of the current block.