Method and apparatus for processing video signal

A method of encoding a video, the method comprising:

• obtaining a prediction sample at a target location in a current block based on a weighted sum of a first prediction sample and a second prediction sample when an intra prediction mode of the current block is a Planar mode, the first prediction sample being obtained by using at least one reference sample having a same y-coordinate as the target location and the second prediction sample being obtained by using at least one reference sample having a same x-coordinate as the target location;
• obtaining a residual sample of the current block by subtracting the prediction sample from an original sample;
• and
• obtaining a transform coefficient by performing a transform on the residual sample,
• wherein if the target location is included in a first region of the current block, the prediction sample is obtained by further usage of a first value derived based on both a top reference sample and a left reference sample, and
• wherein if the target location is included in a second region of the current block, the prediction sample is obtained by further usage of a second value derived based on one of the top reference sample and the left reference sample.

A non-transitory computer-readable medium for storing compressed video data associated with a video signal, the compressed video data comprising:

• information for determining an intra prediction mode of a current block, and
• information for a residual coefficient of the current block,
• wherein a prediction sample at a target location in the current block is obtained based on a weighted sum of a first prediction sample and a second prediction sample when the intra prediction mode is a Planar mode, the first prediction sample being obtained by using at least one reference sample having a same y-coordinate as the target location and the second prediction sample being obtained by using at least one reference sample having a same x-coordinate as the target location;
• wherein a residual sample of the current block is obtained based on the residual coefficient of the current block,
• wherein a reconstruction sample of the current block is obtained based on the prediction sample and the residual sample,
• wherein if the target location is included in a first region of the current block, the prediction sample is obtained by further usage of a first value derived based on both a top reference sample and a left reference sample, and
• wherein if the target location is included in a second region of the current block, the prediction sample is obtained by further usage of a second value derived based on one of the top reference sample and the left reference sample.