Image encoding/decoding method and device, and recording medium having bitstream stored thereon

An image encoding method, the method comprising:

• deriving a motion vector of a current block based on a merge inter mode, wherein the motion vector of the current block includes a first motion vector in a first direction and a second motion vector in a second direction, the first motion vector is derived based on a first inter prediction mode, and the second motion vector is derived based on a second inter prediction mode;
• correcting the motion vector of the current block, wherein the correction is performed on at least one of the first motion vector or the second motion vector,
• based on the motion vector of the current block,
• generating a first prediction block in the first direction and a second prediction block in the second direction;
• and
• based on the first prediction block and the second prediction block, generating a prediction block of the current block.

A method for transmitting data for image information, the method comprising:

• deriving a motion vector of a current block based on a merge inter mode, wherein the motion vector of the current block includes a first motion vector in a first direction and a second motion vector in a second direction, the first motion vector is derived based on a first inter prediction mode, and the second motion vector is derived based on a second inter prediction mode,
• correcting the motion vector of the current block, wherein the correction is performed on at least one of the first motion vector or the second motion vector,
• based on the motion vector of the current block,
• generating a first prediction block in the first direction and a second prediction block in the second direction;
• based on the first prediction block and the second prediction block, generating a prediction block of the current block;
• generating a bitstream by encoding the current block based on the prediction block of the current block;
• and
• transmitting data including the bitstream.