Apparatus and method for encoding and decoding image based on reference block

An method for image encoding, the method comprising:

• determining a first reference block in a first reference image and a second reference block in a second reference image corresponding to a current block;
• determining weight information for combining the first reference block and the second reference block based on a current reference template of the current block, a first reference template of the first reference block, and a second reference template of the second reference block;
• generating a prediction block of the current block by combining the first reference block and the second reference block using the weight information;
• and
• encoding the current block using the prediction block.

A non-transitory computer-readable medium having stored thereon instructions that, when executed by at least one processor individually or collectively, cause the at least one processor to:

• determine a first reference block in a first reference image and a second reference block in a second reference image corresponding to a current block;
• obtain a current reference template indicating a reference template of the current block, a first reference template indicating a reference template of the first reference block, and a second reference template indicating a reference template of the second reference block;
• determine weight information for combining the first reference block and the second reference block, based on the current reference template, the first reference template, and the second reference template;
• generate a prediction block of the current block based on a combination the first reference block and the second reference block according to the weight information;
• and
• encode the current block based on the prediction block to generate motion information of the current block to be stored in the non-transitory computer-readable medium.