| CPC H04N 19/593 (2014.11) [H04N 19/105 (2014.11); H04N 19/109 (2014.11); H04N 19/11 (2014.11); H04N 19/132 (2014.11); H04N 19/139 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/196 (2014.11); H04N 19/52 (2014.11)] | 15 Claims |
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1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including index information for deriving a block vector through bitstream;
deriving a prediction mode for a current block in a current picture as an intra block copy (IBC) prediction mode;
deriving a candidate list for the IBC prediction mode based on the image information, wherein the candidate list includes block vector candidates for a reference block in the current picture;
deriving the block vector for the current block based on the candidate list for the IBC prediction mode and the index information;
generating prediction samples of the current block based on the block vector; and
generating reconstructed samples based on the prediction samples,
wherein the image information comprises information on a maximum number of the block vector candidates included in the candidate list for the IBC prediction mode and information on a maximum number of motion vector candidates included in a candidate list for an inter prediction mode,
wherein the information on the maximum number of the block vector candidates included in the candidate list for the IBC prediction mode is different from the information on the maximum number of the motion vector candidates included in the candidate list for the inter prediction mode,
wherein the information on the maximum number of the block vector candidates included in the candidate list for the IBC prediction mode is obtained independently of a slice type, and
wherein the information on the maximum number of the block vector candidates included in the candidate list for the IBC prediction mode is obtained based only on whether the IBC prediction mode is enabled.
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