METHOD AND DEVICE FOR PROCESSING VIDEO SIGNAL BY USING SUBBLOCK-BASED MOTION COMPENSATION

摘要

Disclosed is a video signal processing method and device for encoding or decoding a video signal. Specifically, the video signal processing method may comprise the steps of: acquiring a first syntax element indicating whether a subblock-based merging mode is applied to a current block; acquiring a second syntax element indicating whether a merging mode using motion vector difference is applied to the current block, when the first syntax element indicates that the subblock-based merging mode is not applied to the current block; acquiring a third syntax element indicating a candidate to be used in inter-prediction for the current block, among candidates contained in a mergence candidate list for the current block, when the second syntax element indicates that the merging mode using motion vector difference is applied to the current block; acquiring information related to the motion vector difference; deriving a motion vector for the current block by adding the motion vector difference to a motion vector for the candidate indicated by the third syntax element; and generating a prediction block for the current block by using the motion vector for the current block.