Image encoding/decoding method and device

Abstract

The present invention relates to an image encoding/decoding method and device. In an image decoding method and device according to an embodiment of the present invention, a reconstructed pixel region within an image to which a current block to be decoded belongs is selected; a motion vector of the reconstructed pixel region is derived on the basis of the reconstructed pixel region and a reference image of the current block; and the derived motion vector is selected as a motion vector of the current block.

1 . An image decoding method comprising:
 determining more than one sub-block of a current block including a first sub-block and a second sub-block;   obtaining a first prediction block for the first sub-block based on a first motion vector;   obtaining a second prediction block for the second sub-block based on a second motion vector; and   determining a final prediction block of the current block based on the first prediction block and the second prediction block,   wherein a boundary prediction sample adjacent to a boundary between the first sub-block and the second sub-block in the final prediction block is determined based on a weighted sum of a first prediction sample in the first prediction block and a second prediction sample in the second prediction block.   
     
     
         2 . The image decoding method of  claim 1 , wherein,
 the first motion vector and the second motion vector are determined based on a motion vector candidate list including a spatial motion vector candidate, and   the motion vector candidate is determined from neighboring blocks of the current block.   
     
     
         3 . The image decoding method of  claim 1 , wherein the first motion vector is determined not to be identical to the second motion vector. 
     
     
         4 . The image decoding method of  claim 1 , wherein,
 the first sub-block is adjacent to a neighboring block of the current block, and   the second sub-block is not adjacent to the neighboring block of the current block.   
     
     
         5 . The image decoding method of  claim 1 , further comprising:
 decoding, from a bitstream, first information indicating whether the current block is partitioned to the more than one sub-block, and   wherein, the more than one sub-block is determined in response to the first information indicating the current block is partitioned to the more than one sub-block.   
     
     
         6 . The image decoding method of  claim 1 , further comprising:
 decoding, from a bitstream, second information indicating shapes of the more than one sub-block, and   wherein, the more than one sub-block is determined based on the shapes of the more than one sub-block that are indicated by the second information.   
     
     
         7 . The image decoding method of  claim 1 , wherein, a first weight and a second weight for the weighted sum of the first prediction sample the second prediction sample are determined based on a location of the boundary prediction sample. 
     
     
         8 . The image decoding method of  claim 7 , wherein, the first weight and the second weight are determined based on a distance from a boundary to the boundary prediction sample. 
     
     
         9 . An image encoding method comprising:
 determining more than one sub-block of a current block including a first sub-block and a second sub-block;   obtaining a first prediction block for the first sub-block based on a first motion vector;   obtaining a second prediction block for the second sub-block based on a second motion vector; and   determining a final prediction block of the current block based on the first prediction block and the second prediction block,   wherein a boundary prediction sample adjacent to a boundary between the first sub-block and the second sub-block in the final prediction block is determined based on a weighted sum of a first prediction sample in the first prediction block and a second prediction sample in the second prediction block.   
     
     
         10 . The image encoding method of  claim 9 , wherein,
 the first motion vector and the second motion vector are determined based on a motion vector candidate list including a spatial motion vector candidate, and   the motion vector candidate is determined from neighboring blocks of the current block.   
     
     
         11 . The image encoding method of  claim 9 , wherein, the first motion vector is determined not to be identical to the second motion vector. 
     
     
         12 . The image encoding method of  claim 9 , wherein,
 the first sub-block is adjacent to a neighboring block of the current block, and   the second sub-block is not adjacent to the neighboring block of the current block.   
     
     
         13 . The image encoding method of  claim 9 , further comprising:
 generating first information indicating whether the current block is partitioned to the more than one sub-block.   
     
     
         14 . The image encoding method of  claim 9 , further comprising:
 generating second information indicating shapes of the more than one sub-block.   
     
     
         15 . The image encoding method of  claim 9 , wherein, a first weight and a second weight for the weighted sum of the first prediction sample the second prediction sample are determined based on a location of the boundary prediction sample. 
     
     
         16 . The image encoding method of  claim 15 , wherein, the first weight and the second weight are determined based on a distance from a boundary to the boundary prediction sample. 
     
     
         17 . A non-transitory computer-readable medium storing a bitstream to be decoded according to an image decoding method, the image decoding comprising:
 determining more than one sub-block of a current block including a first sub-block and a second sub-block;   obtaining a first prediction block for the first sub-block based on a first motion vector;   obtaining a second prediction block for the second sub-block based on a second motion vector; and   determining a final prediction block of the current block based on the first prediction block and the second prediction block,   wherein a boundary prediction sample adjacent to a boundary between the first sub-block and the second sub-block in the final prediction block is determined based on a weighted sum of a first prediction sample in the first prediction block and a second prediction sample in the second prediction block.