Method and apparatus for processing video data
A method and device for decoding video data are disclosed. More specifically, a method of decoding video data may comprise: configuring a block vector candidate list of a current block to which an intra block copy (IBC) prediction mode is applied, the IBC mode referring to another block in a current picture; and generating a prediction sample of the current block based on a block vector included in the block vector candidate list. Configuring the block vector candidate list comprises: configuring the block vector candidate list from a spatial neighboring block to which the IBC prediction mode is applied; and modifying the block vector candidate list based on an history-based motion vector prediction (HMVP) candidate to which the IBC prediction mode is applied when a number of current candidates of the block vector candidate list is smaller than a maximum candidate number.
1. A method of processing video data, comprising:
determining whether a first prediction mode is applied to a current block, the first prediction mode referring to another block in a current picture;
configuring a block vector candidate list of the current block based on the first prediction mode being applied to the current block; and
generating a prediction sample of the current block based on a block vector included in the block vector candidate list,
wherein configuring the block vector candidate list comprises:
configuring the block vector candidate list only based on a spatial neighboring block to which the first prediction mode is applied, an history-based motion vector prediction (HMVP) candidate to which the first prediction mode is applied, and a zero vector by adding a block vector of the spatial neighboring block, the HMVP candidate, and the zero vector to the block vector candidate list in an order of the block vector of the spatial neighboring block, the HMVP candidate, and the zero vector.
2. The method of claim 1 , wherein the zero vector is added to the block vector candidate list until a number of current candidates of the block vector candidate list becomes a maximum candidate number.
3. The method of claim 1 , wherein the spatial neighboring block includes at least one of a left side neighboring block, a left-bottom neighboring block, a top side neighboring block, or a top-right neighboring block.
4. The method of claim 1 , wherein a temporal neighboring candidate and a pairwise candidate generated based on a combination of block vectors included in the block vector candidate list are not included in the block vector candidate list.
5. A method of encoding video data, comprising:
determining whether to apply a first prediction mode to a current block, the first mode referring to another block in a current picture;
configuring a block vector candidate list of the current block based on the first prediction mode being applied to the current block;
generating a prediction sample of the current block based on a block vector included in the block vector candidate list; and
encoding information related to a prediction of the current block,
wherein configuring the block vector candidate list comprises:
configuring the block vector candidate list only based on a spatial neighboring block to which the first prediction mode is applied, an history-based motion vector prediction (HMVP) candidate to which the first prediction mode is applied, and a zero vector by adding a block vector of the spatial neighboring block, the HMVP candidate, and the zero vector to the block vector candidate list in an order of the block vector of the spatial neighboring block, the HMVP candidate, and the zero vector.
6. The method of claim 5 , wherein the zero vector is added to the block vector candidate list until a number of current candidates of the block vector candidate list becomes a maximum candidate number.
7. The method of claim 5 , wherein the spatial neighboring block includes at least one of a left side neighboring block, a left-bottom neighboring block, a top side neighboring block, or a top-right neighboring block.
8. The method of claim 5 , wherein a temporal neighboring candidate and a pairwise candidate generated based on a combination of block vectors included in the block vector candidate list are not included in the block vector candidate list.
9. A transmission method for data comprising a bitstream for an image, the method comprising:
obtaining the bitstream for the image; and
transmitting the data comprising the bitstream,
wherein the bitstream is generated by performing steps of:
determining whether to apply a first prediction mode to a current block, the first mode referring to a block different from the current block in a current picture;
configuring a block vector candidate list of the current block based on the first prediction mode being applied to the current block;
generating a prediction sample of the current block based on a block vector included in the block vector candidate list; and
encoding information related to a prediction of the current block,
wherein configuring the block vector candidate list comprises:
configuring the block vector candidate list only based on a spatial neighboring block to which the first prediction mode is applied, an history-based motion vector prediction (HMVP) candidate to which the first prediction mode is applied, and a zero vector by adding a block vector of the spatial neighboring block, the HMVP candidate, and the zero vector to the block vector candidate list in an order of the block vector of the spatial neighboring block, the HMVP candidate, and the zero vector.