Method and apparatus for processing intra-prediction-based video signal

A video encoding method, comprising:

• determining a prediction mode of a current block from among an intra mode, an inter mode, and an intra block copy mode;
• determining an intra prediction mode of the current block in response to the prediction mode of the current block being the intra mode;
• generating prediction pixels in the current block by performing a DC intra prediction on the current block based on at least one of neighboring pixel of the current block in response to the intra prediction mode of the current block being a DC mode;
• and
• filtering a prediction pixel in the current block by a weighting filter, and
• wherein, the filtered prediction pixel by the weighting filter is determined based on a weighted sum of the top reference pixel, the left reference pixel and the prediction pixel, and
• the left reference pixel of the prediction pixel is included in a same row as the prediction pixel and the top reference pixel of the prediction pixel is included in a same column as the prediction pixel,
• the prediction pixel is filtered by the weighting filter in response to at least one of a first weight for the top reference pixel and a second weight for the left reference pixel greater than zero,
• the first weight is determined to be zero in response to a distance from the top reference pixel greater than a predetermined value and the second weight is determined to be zero in response to a distance from the left reference pixel greater than the predetermined value,
• the predetermined value is determined based on a size of the current block.

A computer-readable recording medium storing a bitstream which is received and decoded by a video decoding method to reconstruct an image,

• wherein the bitstream comprises information indicating an intra prediction mode of a current block, and
• the video decoding method configured to:
• determining a prediction mode of the current block from among an intra mode, an inter mode, and an intra block copy mode;
• determining the intra prediction mode of the current block in response to the prediction mode of the current block being the intra mode;
• generate prediction pixels in the current block by performing a DC intra prediction on the current block based on at least one of neighboring pixels of the current block in response to the intra prediction mode of the current block being a DC mode;
• and
• filter a prediction pixel in the current block by a weighting filter, and
• wherein, the filtered prediction pixel by the weighting filter is determined based on a weighted sum of the top reference pixel, the left reference pixel and the prediction pixel, and
• the left reference pixel of the prediction pixel is included in a same row as the prediction pixel and the top reference pixel of the prediction pixel is included in a same column as the prediction pixel,
• the prediction pixel is filtered by the weighting filter in response to at least one of a first weight for the top reference pixel and a second weight for the left reference pixel greater than zero,
• the first weight is determined to be zero in response to a distance from the top reference pixel greater than a predetermined value and the second weight is determined to be zero in response to a distance from the left reference pixel greater than the predetermined value,
• the predetermined value is determined based on a size of the current block.