Video signal processing method and device

Abstract

According to the present invention, there is provided a method of decoding an image, the method including: partitioning a current block into multiple sub-blocks; performing intra prediction on a first sub-block among the multiple sub-blocks by using a first sub reference sample line; and performing intra prediction on a second sub-block among the multiple sub-blocks by using a second sub reference sample line. Herein, an intra prediction mode of the first sub-block and an intra prediction mode of the second sub-block are the same.

1 . A method of decoding an image, the method comprising:
 partitioning a current block into multiple sub-blocks;   performing intra prediction on a first sub-block among the multiple sub-blocks by using a first sub reference sample line; and   performing intra prediction on a second sub-block among the multiple sub-blocks by using a second sub reference sample line,   wherein an intra prediction mode of the first sub-block and an intra prediction mode of the second sub-block are the same.   
     
     
         2 . The method of  claim 1 , wherein a partition type of the current block is determined on the basis of at least one among a size, a shape, and an intra prediction mode of the current block. 
     
     
         3 . The method of  claim 1 , wherein the second sub reference sample line includes a reference sample included in a line not adjacent to the second sub-block. 
     
     
         4 . The method of  claim 3 , wherein the reference sample is included in a line adjacent to a top or a left side of the current block. 
     
     
         5 . The method of  claim 1 , wherein the second sub reference sample line includes a first reference sample included in the first sub-block, and a second reference sample derived by adding offset to the first reference sample. 
     
     
         6 . The method of  claim 5 , wherein the offset is acquired on the basis of offset between the first reference sample and a neighboring reference sample adjacent to the first reference sample. 
     
     
         7 . The method of  claim 1 , wherein the second sub reference sample line includes a first reference sample included in the first sub-block, and a third reference sample derived by adding offset to a second reference sample included in a line adjacent to the first sub-block. 
     
     
         8 . A method of encoding an image, the method comprising:
 partitioning a current block into multiple sub-blocks;   performing intra prediction on a first sub-block among the multiple sub-blocks by using a first sub reference sample line; and   performing intra prediction on a second sub-block among the multiple sub-blocks by using a second sub reference sample line,   wherein an intra prediction mode of the first sub-block and an intra prediction mode of the second sub-block are the same.   
     
     
         9 . The method of  claim 8 , wherein a partition type of the current block is determined on the basis of at least one among a size, a shape, and an intra prediction mode of the current block. 
     
     
         10 . The method of  claim 8 , wherein the second sub reference sample line includes a reference sample included in a line not adjacent to the second sub-block. 
     
     
         11 . The method of  claim 10 , wherein the reference sample is included in a line adjacent to a top or a left side of the current block. 
     
     
         12 . The method of  claim 8 , wherein the second sub reference sample line includes a first reference sample included in the first sub-block, and a second reference sample derived by adding offset to the first reference sample. 
     
     
         13 . The method of  claim 12 , wherein the offset is acquired on the basis of offset between the first reference sample and a neighboring reference sample adjacent to the first reference sample. 
     
     
         14 . The method of  claim 8 , wherein the second sub reference sample line includes a first reference sample included in the first sub-block, and a third reference sample derived by adding offset to a second reference sample included in a line adjacent to the first sub-block. 
     
     
         15 . An apparatus for decoding an image, the apparatus comprising:
 an intra prediction module partitioning a current block into multiple sub-blocks, performing intra prediction on a first sub-block among the multiple sub-blocks by using a first sub reference sample line, and performing intra prediction on a second sub-block among the multiple sub-blocks by using a second sub reference sample line,   wherein an intra prediction mode of the first sub-block and an intra prediction mode of the second sub-block are the same.