Syntax design method and apparatus for performing coding using syntax

摘要

An image decoding method performed by the decoding apparatus according to the present disclosure includes an affine flag indicating whether affine prediction can be applied to a current block based on a bitstream, and a temporal motion vector based on a subblock of the current block. Decoding a sub-block TMVP flag indicating whether a predictor is available, a group indicating whether to apply a predetermined merge mode to the current block based on the decoded affine flag and the decoded sub-block TMVP flag Determining whether to decode a determined merge mode flag, deriving prediction samples for the current block based on the determination as to whether to decode the predetermined merge mode flag, and the prediction for the current block And generating reconstructed samples for the current block based on samples.