Method and apparatus for affine-based inter prediction of chroma subblocks

摘要

The present invention relates to a motion vector derivation method and apparatus for affine-based inter prediction of a chroma subblock based on a chroma format, the chroma motion vector derivation method comprising: chroma in a horizontal direction and a vertical direction based on chroma format information determining a scaling factor, wherein the chroma format information indicates a chroma format of a current picture to which the current picture block belongs; determining a set (S) of luma subblocks of the luma block based on the value of the chroma scaling factor; determining a motion vector for a chroma subblock of the chroma block based on a motion vector of one or more luma subblocks in the set (S) of the luma subblock.