Interaction between ibc and dmvr

Abstract

Devices, systems and methods for applying intra-block copy (IBC) in video coding are described. In general, methods for integrating IBC with existing motion compensation algorithms for video encoding and decoding are described. In a representative aspect, a method for video encoding using IBC includes determining whether a current block of the current picture is to be encoded using a motion compensation algorithm, and encoding, based on the determining, the current block by selectively applying an intra-block copy to the current block. In a representative aspect, another method for video encoding using IBC includes determining whether a current block of the current picture is to be encoded using an intra-block copy, and encoding, based on the determining, the current block by selectively applying a motion compensation algorithm to the current block.

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, that a first technique is applied for the current video block; and   performing the conversion by applying the first technique and by excluding applying a second technique;   wherein one of the first and the second techniques corresponds to an intra-block copy (IBC) technique, and the other of the first and the second techniques corresponds to a Decoder-side Motion Vector Refinement (DMVR) technique.   
     
     
         2 . The method of  claim 1 , wherein in response to the IBC technique being applied during the conversion, a prediction of the current video block is derived based on sample values from a same video slice with the current video block, and wherein the sample values are determined by block vectors. 
     
     
         3 . The method of  claim 1 , wherein in response to the DMVR technique being applied during the conversion, a refined motion vector for the current video block is derived based on a cost calculation between prediction samples of the current video block in different reference pictures of the current video block. 
     
     
         4 . The method of  claim 3 , wherein the cost calculation is based on a sum of absolute difference (SAD). 
     
     
         5 . The method of  claim 1 , further comprising:
 in response to at least one of reference pictures of the current video block is a current picture which includes the current video block, excluding applying the DMVR technique for the current video block during the conversion.   
     
     
         6 . The method of  claim 1 , wherein the first technique corresponds to the IBC technique, and the second technique corresponds to the DMVR technique. 
     
     
         7 . The method of  claim 1 , wherein the first technique corresponds to the DMVR technique, and the second technique corresponds to the IBC technique. 
     
     
         8 . The method of  claim 1 , wherein the conversion includes encoding the current video block into the bitstream representation. 
     
     
         9 . The method of  claim 1 , wherein the conversion includes decoding the current video block from the bitstream representation. 
     
     
         10 . 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, that a first technique is applied for the current video block; and   performing the conversion by applying the first technique and by excluding applying a second technique;   wherein one of the first and the second techniques corresponds to an intra-block copy (IBC) technique, and the other of the first and the second techniques corresponds to a Decoder-side Motion Vector Refinement (DMVR) technique.   
     
     
         11 . The apparatus of  claim 10 , wherein in response to the IBC technique being applied during the conversion, a prediction of the current video block is derived based on sample values from a same video slice with the current video block, and wherein the sample values are determined by block vectors. 
     
     
         14 . The apparatus of  claim 10 , wherein in response to the DMVR technique being applied during the conversion, a refined motion vector for the current video block is derived based on a cost calculation between prediction samples of the current video block in different reference pictures of the current video block. 
     
     
         15 . The apparatus of  claim 14 , wherein the cost calculation is based on a sum of absolute difference (SAD). 
     
     
         16 . The apparatus of  claim 10 , further comprising:
 in response to at least one of reference pictures of the current video block is a current picture which includes the current video block, excluding applying the DMVR technique for the current video block during the conversion.   
     
     
         17 . The apparatus of  claim 10 , wherein the conversion includes encoding the current video block into the bitstream representation. 
     
     
         18 . The apparatus of  claim 10 , wherein the conversion includes decoding the current video block from the bitstream representation. 
     
     
         19 . A non-transitory computer-readable storage medium storing instructions that cause a processor to:
 determining, for a conversion between a current video block of a video and a bitstream representation of the video, that a first technique is applied for the current video block; and   performing the conversion by applying the first technique and by excluding applying a second technique;   wherein one of the first and the second techniques corresponds to an intra-block copy (IBC) technique, and the other of the first and the second techniques corresponds to a Decoder-side Motion Vector Refinement (DMVR) technique.   
     
     
         20 . 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, that a first technique is applied for the current video block; and   generating the bitstream representation from the current video block by using the first technique and by excluding applying a second technique;   wherein one of the first and the second techniques corresponds to an intra-block copy (IBC) technique, and the other of the first and the second techniques corresponds to a Decoder-side Motion Vector Refinement (DMVR) technique.