Image decoding method and device therefor
AssigneeLG Electronics Inc.
InventorsNaeri PARK, Jaehyun LIM, Junghak NAM, Jangwon CHOI
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Abstract
An image decoding method performed by a decoding device, according to the present disclosure, comprises the steps of: deriving an intra block copy (IBC) mode as a prediction mode of a current block; deriving one or more block vectors and/or scaling information for the IBC mode; deriving a revised reference block for the current block by using the one or more block vectors and/or the scaling information in a current picture; deriving a prediction sample of the current block on the basis of the revised reference block; and generating a reconstructed picture on the basis of the prediction sample.
Claims15
An apparatus for decoding an image, the apparatus comprising:
- a memory;
- and
- at least one processor coupled to the memory, the at least one processor configured to:
- derive an intra block copy (IBC) mode as a prediction mode of a current block;
- derive a revised reference block for the current block in a current picture;
- derive a prediction sample of the current block based on the revised reference block;
- and
- generate a reconstructed picture based on the prediction sample,
- wherein whether affine prediction is applied to the current block is determined,
- wherein, based on the affine prediction being applied to the current block, block vector information and an affine angle index of the current block are obtained through a bitstream, and
- wherein the revised reference block for the current block is derived based on the block vector information and the affine angle index of the current block.
An apparatus for encoding an image, the apparatus comprising:
- a memory;
- and
- at least one processor coupled to the memory, the at least one processor configured to:
- derive an intra block copy (IBC) mode as a prediction mode of a current block;
- derive a revised reference block for the current block in a current picture;
- derive a prediction sample of the current block based on the revised reference block;
- and
- encode image information including prediction mode information of the current block,
- wherein whether affine prediction is applied to the current block is determined,
- wherein, based on the affine prediction being applied to the current block, block vector information and an affine angle index of the current block are derived, and
- wherein the revised reference block for the current block is derived based on the block vector information and the affine angle index of the current block.
An apparatus for transmitting data for image, the apparatus comprising:
- at least one processor configured to obtain a bitstream of image information including prediction mode information of a current block;
- and
- a transmitter configured to transmit the data including the bitstream of the image information which includes the prediction mode information,
- wherein the prediction mode information is encoded by deriving an intra block copy (IBC) mode as a prediction mode of the current block, deriving a revised reference block for the current block in a current picture, and deriving a prediction sample of the current block based on the revised reference block,
- wherein whether affine prediction is applied to the current block is determined,
- wherein, based on the affine prediction being applied to the current block, block vector information and an affine angle index of the current block are derived, and
- wherein the revised reference block for the current block is derived based on the block vector information and the affine angle index of the current block.
Dependencies are inferred from the claim text.