Apparatus and method for encoding and decoding image by using reference block

A method for image encoding, the method comprising:

• determining at least one of a first reference block in a current picture encoded before a current block or a second reference block in a previous picture encoded before the current block, based on template matching;
• identifying a corresponding location of a pre-determined location within the current block from at least one of the first reference block or the second reference block;
• generating a prediction block by performing intra prediction on the current block according to an intra prediction mode used to encode a sample at the identified corresponding location;
• and
• encoding the current block using the prediction block.

A non-transitory computer-readable medium having a bitstream recorded thereon,

• wherein the bitstream includes a result of encoding a current block, and
• the result of encoding the current block is generated by:
• determine at least one of a first reference block in a current picture encoded before the current block or a second reference block in a previous picture encoded before the current block, based on template matching;
• identify a corresponding location of a pre-determined location within the current block from at least one of the first reference block or the second reference block;
• generate a prediction block by performing intra prediction on the current block according to an intra prediction mode used to encode a sample at the identified corresponding location;
• and
• encode the current block using the prediction block.