Method and apparatus for encoding/decoding images using a prediction method adopting in-loop filtering

A video encoding method performed by a video encoding apparatus, the method comprising:

• generating a prediction block by performing an intra prediction on a current block, the intra prediction being performed by using an intra prediction mode relating to the current block and neighboring pixels adjacent to the current block;
• determining, based on a direction of the intra prediction mode, both whether to perform filtering on at least one predicted pixel adjacent to a boundary of the prediction block and a location of the at least one predicted pixel on which the filtering is performed;
• performing the filtering on the at least one predicted pixel adjacent to the boundary of the prediction block when the filtering is determined to be performed based on the direction of the intra prediction mode;
• generating a residual block by subtracting the filtered prediction block from the current block;
• and
• encoding the residual block by performing transformation and quantization on coefficients of the residual block.

A non-transitory computer-readable recording medium storing a bitstream that is generated by a video encoding method performed by a video encoding apparatus, the method comprising:

• generating a prediction block by performing an intra prediction on a current block, the intra prediction being performed by using an intra prediction mode relating to the current block and neighboring pixels adjacent to the current block;
• determining, based on a direction of the intra prediction mode, both whether to perform filtering on at least one predicted pixel adjacent to a boundary of the prediction block and a location of the at least one predicted pixel on which the filtering is performed;
• performing the filtering on the at least one predicted pixel adjacent to the boundary of the prediction block when the filtering is determined to be performed based on the direction of the intra prediction mode;
• generating a residual block by subtracting the filtered prediction block from the current block;
• and
• encoding the residual block by performing transformation and quantization on coefficients of the residual block.

A non-transitory computer-readable recording medium storing a bitstream that is received and decoded by a video decoding apparatus to reconstruct a current block included in an image, the bitstream comprising:

• quantized coefficients of the current block;
• and
• prediction information of the current block,
• wherein the quantized coefficients of the current block are inverse-quantized and inverse-transformed to generate a residual block,
• the prediction information is used to generate a prediction block of the current block by performing an intra prediction on the current block, the intra prediction being performed by using an intra prediction mode relating to the current block and neighboring pixels adjacent to the current block,
• both whether to perform filtering on at least one predicted pixel adjacent to a boundary of the prediction block and a location of the at least one predicted pixel on which the filtering is performed are determined based on a direction of the intra prediction mode,
• the at least one predicted pixel adjacent to the boundary of the prediction block is filtered when the filtering is determined to be performed based on the direction of the intra prediction mode, and
• the residual block and the filtered prediction block are added to reconstruct the current block.