Method and device for video coding using template-based prediction

A method of encoding a current block by a video encoding device, the method comprising:

• determining a distance index (adjacent_idx) that indicates a distance between the current block and a template region;
• determining the template region based on the distance between the current block and the template region, and a shape of the template region;
• searching for an optimal template in a search region by using the template region and based on template matching, wherein the search region is defined within a reconstructed region of the current block;
• and
• generating a prediction block of the current block from a reference block corresponding to the optimal template.

A computer-readable recording medium storing a bitstream generated by a video encoding method, the video encoding method comprises:

• determining a distance index (adjacent_idx) that indicates a distance between a current block and a template region;
• determining the template region based on the distance between the current block and the template region, and a shape of the template region;
• searching for an optimal template in a search region, by using the template region and based on template matching, wherein the search region is defined within a reconstructed region of the current block;
• and
• generating a prediction block of the current block from a reference block corresponding to the optimal template.