Video signal processing method and device

Abstract

An image decoding method according to the present invention can comprise the steps of: deriving first reference samples located at the upper end and on the left side of a current block; deriving second reference samples located on the right side and at the lower end of the current block; and acquiring a prediction sample for the current block on the basis of the first reference samples and the second reference samples, wherein the second reference samples can be derived on the basis of the first reference samples and temporary prediction samples generated by performing temporary intra prediction on the current block on the basis of a temporary intra prediction mode.

1 . A method of decoding an image, the method comprising:
 deriving first reference samples located at a top and a left of a current block;   deriving second reference samples located at a right and a bottom of the current block; and   obtaining a prediction sample for the current block based on the first reference samples and the second reference samples,   wherein the second reference samples are derived based on temporary prediction samples generated by performing temporary intra prediction on the current block based on the first reference samples and a temporary intra prediction mode.   
     
     
         2 . The method of  claim 1 , wherein the second reference sample is derived by copying a temporary prediction sample located at a boundary of the current block. 
     
     
         3 . The method of  claim 1 , wherein the second reference sample is derived based on a temporary prediction sample located at a boundary of the current block and a neighboring temporary prediction sample adjacent to the temporary prediction sample. 
     
     
         4 . The method of  claim 1 , wherein the prediction sample is obtained based on a weighted sum operation of the first reference sample and the second reference sample, and
 wherein the weight used in the weighted sum operation is determined based on a position of the prediction sample, a position of the first reference sample, and a position of the second reference sample.   
     
     
         5 . The method of  claim 1 , wherein the first reference sample and the second reference sample are placed in a direction indicated by an intra prediction mode of the current block in a prediction target sample. 
     
     
         6 . The method of  claim 1 , wherein one of the first reference sample and the second reference sample is placed in a direction indicated by an intra prediction mode of the current block in a prediction target sample, and the other is placed in a direction opposite to the direction indicated by the intra prediction mode. 
     
     
         7 . The method of  claim 1 , wherein the temporary intra prediction mode is a planar or a DC mode. 
     
     
         8 . A method of encoding an image, the method comprising:
 deriving first reference samples located at a top and a left of a current block;   deriving second reference samples located at a right and a bottom of the current block; and   obtaining a prediction sample for the current block, based on the first reference samples and the second reference samples,   wherein the second reference samples are derived based on temporary prediction samples generated by performing temporary intra prediction on the current block based on the first reference samples and a temporary intra prediction mode.   
     
     
         9 . The method of  claim 8 , wherein the second reference sample is derived by copying a temporary prediction sample located at a boundary of the current block. 
     
     
         10 . The method of  claim 8 , wherein the second reference sample is derived based on a temporary prediction sample located at a boundary of the current block and a neighboring temporary prediction sample adjacent to the temporary prediction sample. 
     
     
         11 . The method of  claim 8 , wherein the prediction sample is obtained based on a weighted sum operation of the first reference sample and the second reference sample, and
 wherein the weight used in the weighted sum operation is determined based on a position of the prediction sample, a position of the first reference sample, and a position of the second reference sample.   
     
     
         12 . The method of  claim 8 , wherein the first reference sample and the second reference sample are placed in a direction indicated by an intra prediction mode of the current block in a prediction target sample. 
     
     
         13 . The method of  claim 8 , wherein one of the first reference sample and the second reference sample is placed in a direction indicated by an intra prediction mode of the current block in a prediction target sample, and the other is placed in a direction opposite to the direction indicated by the intra prediction mode. 
     
     
         14 . The method of  claim 8 , wherein the temporary intra prediction mode is a planar or a DC mode. 
     
     
         15 . An apparatus for decoding an image, the apparatus comprising:
 an intra prediction unit to derive first reference samples located at a top and a left of a current block, derive second reference samples located at a right and a bottom of the current block, and obtain a prediction sample for the current block based on the first reference samples and the second reference samples,   wherein the second reference samples are derived based on temporary prediction samples generated by performing temporary intra prediction on the current block based on the first reference samples and a temporary intra prediction mode.