Image encoding/decoding method and device, and recording medium storing bitstream

Abstract

Provided are an image encoding/decoding method and device. An image decoding method according to the present invention comprises the steps of: determining an intra prediction mode of a current block; and generating a prediction block of the current block by performing prediction on the basis of the intra prediction mode of the current block. An intra prediction mode for a luminance block of the current block is derived by means of a most probable mode (MPM) list comprises a plurality of MPM candidates. The MPM list can be constructed independently from as to whether a plurality of reference sample lines are used and whether a divided prediction is performed by means of a sub-block.

1 - 19 . (canceled) 
     
     
         20 . A video decoding method, comprising:
 deriving a prediction mode of a current block based on a bitstream; and   generating a prediction block of the current blocking by performing a prediction based on the prediction mode of the current block.   
     
     
         21 . The video decoding method of  claim 20 , wherein:
 whether the current block is partitioned or not is determined using block partition information,   a direction of partitioning for the current block is determined using partition direction information,   whether the block partition information is signaled via the bitstream is determined according to whether a horizontal size and a vertical size of the current block are smaller than or equal to a predetermined size.   
     
     
         22 . The video decoding method of  claim 21 , wherein:
 an intra prediction mode of the current block is applied to a plurality of sub-blocks commonly in a case that the current block is partitioned.   
     
     
         23 . The video decoding method of  claim 20 , wherein:
 the prediction is an intra prediction.   the intra prediction is performed using a Most Probable Mode (MPM) list, and   the intra prediction is performed using one of 5 candidates of the MPM list.   
     
     
         24 . The video decoding method of  claim 23 , wherein:
 the intra prediction doesn't use a Planar mode in a case that a reference sample line index for the current block is not 0.   
     
     
         25 . The video decoding method of  claim 23 , wherein:
 an intra prediction mode of the intra prediction is determined based on a ratio of a horizontal length of the current block and a vertical length of the current block.   
     
     
         26 . The video decoding method of  claim 23 , wherein:
 an intra prediction mode of the intra prediction is determined, and   the determined intra prediction mode is changed in a case that a horizontal length of the current block and a vertical length of the current block are different from each other.   
     
     
         27 . The video decoding method of  claim 23 , wherein:
 the prediction mode is an intra prediction which uses a reference sample adjacent to the current block,   the intra prediction is performed using one of a plurality of candidates of a Most Probable Mode (MPM) list, and   a Planar mode is not included in the plurality of the candidates.   
     
     
         28 . The video decoding method of  claim 20 , wherein:
 the prediction is an intra prediction,   the intra prediction is performed using information related with the prediction, and   a Planar mode is used for the intra prediction and a Most Probable Mode (MPM) list is not derived in a case that a specific prediction method is used according to the information related with the prediction.   
     
     
         29 . The video decoding method of  claim 20 , wherein:
 the prediction is a combination of an intra prediction and an Inter prediction, and   only a specific intra prediction mode is used for the intra prediction.   
     
     
         30 . The video decoding method of  claim 29 , wherein:
 a Most Probable Mode (MPM) list for the prediction is not derived in a cased that the combination is used.   
     
     
         31 . The video decoding method of  claim 20 , wherein:
 the prediction is an intra prediction using a DC mode,   a reference sample of the intra prediction is constructed using a reference sample line selected from a plurality of reference sample lines.   
     
     
         32 . The video decoding method of  claim 20 , wherein:
 the prediction is position information-based prediction using a reconstructed sample block comprised in a current picture comprising the current block as a prediction block of the current block,   the reconstructed sample block is determined based on location information,   the location information is information related to a difference between a location of the current block and a location of the reconstructed sample block,   whether to apply the location information-based prediction is determined according to a size of the current block.   
     
     
         33 . The video decoding method of  claim 32 , wherein:
 availability information indicating whether the location information-based prediction is available at a higher level of the current block is signaled, and   a flag indicating whether the location information-based prediction is used for the current block is signaled in a case that the location information-based prediction is available for the higher level of the current block.   
     
     
         34 . The video decoding method of  claim 20 , wherein:
 the current block is a chroma block,   the prediction is inter-component prediction using a signal of a luma block corresponding to the chroma block, and   whether the inter-component prediction is performed is determined based on a size of the chroma block.   
     
     
         35 . The video decoding method of  claim 20 , wherein:
 the current block is a chroma block,   the prediction is inter-component prediction using a signal of a luma block corresponding to the chroma block,   whether the inter-component prediction is performed is determined based on a coding parameter for the current block, and   the coding parameter comprises at least one of a slice type of the current block, information for a partitioning using a tree for the current block and intra partitioning information for the current block.   
     
     
         36 . The video decoding method of  claim 35 , wherein:
 a flag indicating whether the inter-component prediction is performed is signaled via the bitstream in a case that the coding parameter satisfies a predetermined condition.   
     
     
         37 . The video decoding method of  claim 36 , wherein:
 the flag is signaled for a Coding Unit (CU).   
     
     
         38 . A video encoding method, comprising:
 deriving a prediction mode of a current block; and   generating a prediction block of the current blocking by performing a prediction based on the prediction mode of the current block, wherein   a bitstream indicating the prediction mode is generated.   
     
     
         39 . A non-transitory computer readable recording medium storing a bitstream, the bitstream comprising:
 information for deriving a prediction mode for a current block;   wherein the prediction mode of the current block is derived using the information, and   a prediction block of the current block is generated by performing a prediction based on the prediction mode of the current block.