Image coding/decoding method and apparatus therefor

A method of encoding an image by an apparatus, comprising:

• determining an intra prediction mode of a current block;
• configuring reference samples based on blocks neighboring to the current block;
• performing an intra prediction for the current block based on the reference samples and the intra prediction mode to obtain prediction samples of the current block;
• filtering the prediction samples of the current block;
• and
• obtaining residual samples for the current block based on the prediction samples and original samples of the current block,
• wherein the filtering the prediction samples comprises:
• filtering the prediction samples based on the intra prediction mode and further based on only a width among the width and a height of the current block, when the intra prediction mode is one between mode 2 and mode 10 in an intra prediction method in which mode 0 to mode 66 are defined;
• and
• filtering the prediction samples based on the intra prediction mode and further based on only the height among the width and the height of the current block, when the intra prediction mode is one between mode 59 and mode 66 in the intra prediction method.

A non-transitory decoder-readable storage medium for storing encoded picture information generated by performing the steps of:

• determining an intra prediction mode of a current block;
• configuring reference samples based on blocks neighboring to the current block;
• performing an intra prediction for the current block based on the reference samples and the intra prediction mode to obtain prediction samples of the current block;
• filtering the prediction samples of the current block;
• and
• obtaining residual samples for the current block based on the prediction samples and original samples of the current block,
• wherein the filtering the prediction samples comprises:
• filtering the prediction samples based on the intra prediction mode and further based on only a width among the width and a height of the current block, when the intra prediction mode is one between mode 2 and mode 10 in an intra prediction method in which mode 0 to mode 66 are defined;
• and
• filtering the prediction samples based on the intra prediction mode and further based on only the height among the width and the height of the current block, when the intra prediction mode is one between mode 59 and mode 66 in the intra prediction method.