Motion information prediction method and apparatus for distortion due to projection formation conversion

A method of encoding an image, the method comprising:

• determining whether to refine motion vectors of blocks in a current sequence;
• determining a motion vector of a current block in the current sequence;
• refining the motion vector of the current block in response to that the motion vectors of the blocks in the current sequence are determined to be refined;
• and
• encoding motion vector refinement information of the current sequence, the motion vector refinement information indicating whether to refine the motion vectors of the blocks in the current sequence,
• wherein the motion vector is refined according to a size of the current block.

A non-transitory computer readable recording medium storing a bitstream that is received and decoded by an image decoding method and is used to reconstruct an image,

• wherein the bitstream comprises motion vector prediction information of a current sequence,
• the motion vector prediction information of the current sequence indicates whether to refine motion vectors of blocks in a current sequence,
• the motion vector of the current block is refined based on the motion vector refinement information of the current sequence, and
• the refined motion vector of the current block is used to reconstruct the current block,
• wherein the motion vector is refined according to a size of the current block.