Interaction between pairwise average merging candidates and ibc

Abstract

A method of decoding visual information from a coded representation of the visual information includes determining that a block being decoded representing a portion of an encoded picture of visual information is coded using a motion candidate associated with a motion vector, wherein the motion vector is derived as a weighted average of a plurality of motion vectors, wherein all of the plurality of motion vectors refer to a same picture type, and wherein a first picture type represents a current picture and a second picture type represents a reference pictures different from the current picture and decoding the block being decoded by using the motion candidate.

What is claimed is: 
     
         1 . A method of coding video data, comprising:
 determining, for a conversion between a current video block of a video and a bitstream representation of the video, a motion candidate associated with a motion vector, wherein the motion vector is derived based on a weighted average of a plurality of motion vectors, wherein all the plurality of motion vectors refer to a reference picture not identical to the current picture which includes the current video block; and   performing the conversion based on the determining.   
     
     
         2 . The method of  claim 1 , comprising applying equal weights to all the plurality of motion vectors. 
     
     
         3 . The method of  claim 1 , wherein the motion candidate is a motion vector of a pair-wise average merge candidate in inter prediction mode. 
     
     
         4 . The method of  claim 3 , wherein the motion candidate of the pair-wise merge candidate is derived based on a weighted average of a first motion vector of a first merge candidate and a second motion vector of a second merge candidate. 
     
     
         5 . The method of  claim 1 , wherein instead of plurality of motion vectors referring to a reference picture not identical to the current picture, all the plurality of motion vectors refer to the reference picture identical to the current picture. 
     
     
         6 . The method of  claim 1 , wherein the motion candidate is a motion vector of a sub-block in a block coded with the spatial-temporal motion vector prediction (STMVP) mode. 
     
     
         7 . The method of  claim 1 , wherein the conversion includes encoding the current video block into the bitstream representation. 
     
     
         8 . The method of  claim 1 , wherein the conversion includes decoding the current video block from the bitstream representation. 
     
     
         9 . An apparatus for coding video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
 determining, for a conversion between a current video block of a video and a bitstream representation of the video, a motion candidate associated with a motion vector, wherein the motion vector is derived based on a weighted average of a plurality of motion vectors, wherein all the plurality of motion vectors refer to a reference picture not identical to the current picture which includes the current video block; and   performing the conversion based on the determining.   
     
     
         10 . The apparatus of  claim 9 , comprising applying equal weights to all the plurality of motion vectors. 
     
     
         11 . The apparatus of  claim 9 , wherein the motion candidate is a motion vector of a pair-wise average merge candidate in inter prediction mode. 
     
     
         12 . The apparatus of  claim 11 , wherein the motion candidate of the pair-wise merge candidate is derived based on a weighted average of a first motion vector of a first merge candidate and a second motion vector of a second merge candidate. 
     
     
         13 . The apparatus of  claim 9 , wherein instead of plurality of motion vectors referring to a reference picture not identical to the current picture, all the plurality of motion vectors refer to the reference picture identical to the current picture. 
     
     
         14 . The apparatus of  claim 9 , wherein the motion candidate is a motion vector of a sub-block in a block coded with the spatial-temporal motion vector prediction (STMVP) mode. 
     
     
         15 . The apparatus of  claim 9 , wherein the conversion includes encoding the current video block into the bitstream representation. 
     
     
         16 . The apparatus of  claim 9 , wherein the conversion includes decoding the current video block from the bitstream representation. 
     
     
         17 . A non-transitory computer-readable storage medium storing instructions that cause a processor to:
 determine, for a conversion between a current video block of a video and a bitstream representation of the video, a motion candidate associated with a motion vector, wherein the motion vector is derived based on a weighted average of a plurality of motion vectors, wherein all the plurality of motion vectors refer to a reference picture not identical to the current picture which includes the current video block; and   perform the conversion based on the determining.   
     
     
         18 . The non-transitory computer-readable storage medium of  claim 17 , the motion candidate is a motion vector of a pair-wise average merge candidate in inter prediction mode. 
     
     
         19 . A non-transitory computer-readable recording medium storing a bitstream representation which is generated by a method performed by a video processing apparatus, wherein the method comprises:
 determining, for a conversion between a current video block of a video and a bitstream representation of the video, a motion candidate associated with a motion vector, wherein the motion vector is derived based on a weighted average of a plurality of motion vectors, wherein all the plurality of motion vectors refer to a reference picture not identical to the current picture which includes the current video block; and   generating the bitstream representation from the current video block based on the determining.   
     
     
         20 . The non-transitory computer-readable storage medium of  claim 19 , the motion candidate is a motion vector of a pair-wise average merge candidate in inter prediction mode.