Method and device for encoding/decoding image, and recording medium having stored bitstream

Abstract

The present invention relates to an image encoding/decoding method. The image decoding method includes splitting a coding tree unit (CTU) into at least one coding unit (CU) according to a block splitting structure and performing CU-based decoding, in which the block partition structure is configured such that at least one of binary tree splitting and ternary tree splitting is performed after quadtree splitting is performed.

1 . A method of decoding a video, the method comprising:
 decoding residual coefficients of a current block;   performing an inverse-quantization for the residual coefficients of the current block; and   performing an inverse-transform for inverse-quantized residual coefficients, resulting from the inverse-quantization, of the current block,   wherein residual coefficients included in a remaining region excluding a top-left region of the current block have a value of 0.   
     
     
         2 . The method of  claim 1 , wherein a size of the top-left region is adaptively determined based on a size of the current block. 
     
     
         3 . The method of  claim 1 , wherein the inverse-quantization is performed by multiplying a scaling factor to a residual coefficient, and
 wherein the scaling factor is determined differently in units of a region of a predetermined size.   
     
     
         4 . The method of  claim 1 , wherein the inverse-transform comprises an inverse-secondary transform and an inverse-primary transform. 
     
     
         5 . The method of  claim 1 , wherein the current block is one of a plurality of blocks generated by splitting a parent node coding block, and
 wherein when the parent node coding block crosses both a lower boundary and a right boundary of a picture, the parent node coding block is implicitly split by quad-tree partitioning.   
     
     
         6 . A method of encoding a video, the method comprising:
 obtaining residual samples of a current block;   performing a transform for the residual samples of the current block;   performing a quantization for transformed coefficients, resulting from the transform, of the current block; and   encoding residual coefficients, resulting from the quantization, into a bitstream,   wherein residual coefficients included in a remaining region excluding a top-left region of the current block are set to 0.   
     
     
         7 . A method of encoding a video, the method comprising:
 obtaining residual samples of a current block;   performing a transform for the residual samples of the current block;   performing a quantization for transformed coefficients, resulting from the transform, of the current block; and   encoding residual coefficients, resulting from the quantization, into a bitstream,   wherein residual coefficients included in a remaining region excluding a top-left region of the current block are set to 0.   
     
     
         8 . A non-transitory computer-readable storage medium storing compressed video data generated by an encoding method, wherein the encoding method comprises:
 obtaining residual samples of a current block;   performing a transform for the residual samples of the current block;   performing a quantization for transformed coefficients, resulting from the transform, of the current block; and   encoding residual coefficients, resulting from the quantization, into a bitstream, wherein residual coefficients included in a remaining region excluding a top-left region of the current block are set to 0.