Image decoding method and apparatus based on affine motion prediction using constructed affine MVP candidates in image coding system

摘要

An image decoding method performed by a decoding apparatus according to the present invention includes obtaining motion prediction information for a current block from a bitstream, generating an affine MVP candidate list for the current block, and the affine MVP candidate list deriving CPMVPs for the CPs of the current block based on deriving CPMVs for the CPs of a block, and deriving prediction samples for the current block based on the CPMVs.