Intra prediction method and apparatus

An image encoding method performed by an image encoding apparatus, comprising:

• determining an intra-prediction direction for a current block among a plurality of intra-prediction directions;
• deriving a first prediction value for the current block by performing prediction based on the intra-prediction direction using, as a first reference sample, at least one of neighboring samples adjacent to the current block;
• deriving a second prediction value for the current block by using, as a second reference sample, a reference sample positioned in the current block;
• and
• deriving a final prediction value for the current block by using values obtained by applying a first weight to the first prediction value and applying a second weight to the second prediction value,
• wherein the first weight and the second weight are determined based on which intra-prediction direction of the plurality of intra-prediction directions is determined as the intra-prediction direction for the current block.

A non-transitory computer-readable recording medium comprising a bitstream that is generated by an image encoding method, the image encoding method comprising:

• determining an intra-prediction direction for a current block among a plurality of intra-prediction directions;
• deriving a first prediction value for the current block by performing prediction based on the intra-prediction direction using, as a first reference sample, at least one of neighboring samples adjacent to the current block;
• deriving a second prediction value for the current block by using, as a second reference sample, a reference sample positioned in the current block;
• and
• deriving a final prediction value for the current block by using values obtained by applying a first weight to the first prediction value and applying a second weight to the second prediction value,
• wherein the first weight and the second weight are determined based on which intra-prediction direction of the plurality of intra-prediction directions is determined as the intra-prediction direction for the current block.