FIELD: image processing.
SUBSTANCE: invention relates to a shared list for prediction when encoding and decoding video. Methods and devices for constructing a list of merge candidates for intraframe block copying (IBC) mode are proposed, and they comprise the following steps: inserting the block vector of the left neighbour block of the current block into the initial merge list of the current block, when the left neighbour block is available and the left neighbour block uses IBC mode; inserting the block vector of the aforementioned neighbour block of the current block into the initial merge list, when the aforementioned neighbour block is available, the aforementioned neighbour block uses the IBC mode, and the block vector of the aforementioned neighbour block is not the same as the block vector of the left neighbour block; inserting the block vector of the last candidate in the history-based motion vector predictor (HMVP) into the initial merge list when the block vector of the aforementioned neighbour block is not the same as the block vector of the last HMVP candidate, and when the block vector of the left neighbour block is not the same as the block vector of the latest HMVP candidate; obtaining a block vector of the current block corresponding to the initial merge list after the above insertion processes, and a merge candidate index for the current block.
EFFECT: increased compression ratio with little or no loss of image quality.
16 cl, 10 dwg, 2 tbl
