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

An image encoding method, the method comprising:

• partitioning a current block into a plurality of sub-regions;
• determining a control point vector of a current sub-region among the plurality of sub-regions;
• determining a motion vector of the current sub-region based on the control point vector;
• and
• generating a prediction sample of the current block based on the motion vector of the current sub-region.

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

• obtaining a bitstream for the image information, wherein the bitstream is generated based on partitioning a current block into a plurality of sub-regions,
• determining a control point vector of a current sub-region among the plurality of sub-regions,
• determining a motion vector of the current sub-region based on the control point vector,
• generating a prediction sample of the current block based on the motion vector of the current sub-region,
• generating a bitstream by encoding the current block based on the prediction sample of the current block;
• and
• transmitting the data including the bitstream.