Method and apparatus for processing video signal

A method of encoding a video, the method comprising:

• obtaining a prediction sample of a transform block by performing intra prediction;
• obtaining a residual sample the transform block;
• determining whether a transform is skipped for the transform block;
• obtaining a transform coefficient of the transform block by applying or skipping the transform for the transform block;
• and
• quantizing the transform coefficient of the transform block,
• wherein when it is determined that the transform is not skipped for the transform block, obtaining the transform coefficient comprises:
• determining a transform type of the transform block based on a transform set;
• and
• performing the transform based on the determined transform type, and
• wherein a transform skip flag specifying whether the transform is skipped or not is not encoded into a bitstream when a coding block including the transform block is partitioned into vertically or horizontally, and
• wherein when the coding block including the transform block is partitioned into vertically or horizontally, skipping the transform for the transform block is not allowed.

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

• information on a residual coefficient of a transform block generated by encoding a residual sample being a difference between an original sample and a prediction sample of the transform block,
• wherein the prediction sample of the transform block is obtained by performing intra prediction,
• wherein the residual sample of the transform block is obtained by applying or skipping an inverse-transform for the transform block,
• wherein whether to skip the inverse-transform for the transform block or not is determined based on a value of a transform skip flag,
• wherein when it is determined not to skip the inverse-transform for the transform block, the inverse-transform is performed based on
• a transform type of the transform block, the transform type being determined based on a transform set,
• wherein the transform skip flag, specifying whether the inverse-transform is skipped for the transform block or not, is not included in the compressed data when a coding block including the transform block is partitioned into vertically or horizontally, and
• wherein when the coding block including the transform block is partitioned into vertically or horizontally, skipping the inverse-transform for the transform block is not allowed.