Intra prediction device and method involving matrix-based intra prediction
An image decoding method includes obtaining image information including residual information and prediction-related information through a bitstream, deriving transform coefficients based on the residual information, generating residual samples for a current block based on the transform coefficients, deriving an intra prediction mode for the current block based on the prediction-related information, generating prediction samples for the current block based on the intra prediction mode, generating reconstructed samples for the current block based on the prediction samples and the residual samples, wherein the image information includes flag information related to whether an intra prediction mode type for the current block is a matrix-based intra prediction (MIP), wherein the intra prediction mode type for the current block is determined as the MIP based on the flag information, and wherein the prediction samples for the current block are generated based on MIP samples.
1. A decoding apparatus for an image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain image information including residual information and prediction-related information through a bitstream;
generate residual samples for a current block based on the residual information;
generate prediction samples for the current block based on the prediction-related information; and
generate reconstructed samples for the current block based on the prediction samples and the residual samples,
wherein the image information includes flag information related to whether an intra prediction mode type for the current block is a matrix-based intra prediction (MIP), wherein for the current block of which size is equal to 64×8, the flag information related to whether the intra prediction mode type for the current block is the MIP is included in the image information,
wherein whether the intra prediction mode type for the current block is the MIP is determined based on the flag information,
wherein a value of the flag information being equal to 1 is related to representing that the intra prediction mode type for the current block is the MIP, and a value of the flag information being equal to 0 is related to representing that the intra prediction mode type for the current block is not the MIP,
wherein based on the value of the flag information being equal to 1, the image information includes MIP mode information, wherein the MIP mode information is related to an MIP mode applied to the current block and the MIP mode is used to derive an MIP matrix for the current block,
wherein the MIP matrix is derived based on (i) a width and a height of the current block for the MIP and (ii) the MIP mode information, and
wherein the prediction samples for the current block are generated based on the MIP matrix.
2. An encoding apparatus for an image encoding, the encoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
determine whether a matrix-based intra prediction (MIP) is applied to a current block;
generate prediction samples for the current block based on the determination that the MIP is applied to the current block;
generate prediction-related information based on the determination that the MIP is applied to the current block;
generate residual samples for the current block based on the prediction samples;
generate residual information based on residual samples; and
encode image information including the prediction-related information and the residual information,
wherein the prediction-related information includes flag information related to whether an intra prediction mode type for the current block is the MIP, wherein for the current block of which size is equal to 64×8, the flag information related to whether the intra prediction mode type for the current block is the MIP is included in the image information,
wherein whether the intra prediction mode type for the current block is the MIP is determined based on the flag information,
wherein a value of the flag information being equal to 1 is related to representing that the intra prediction mode type for the current block is the MIP, and a value of the flag information being equal to 0 is related to representing that the intra prediction mode type for the current block is not the MIP,
wherein based on the value of the flag information being equal to 1, the image information includes MIP mode information, wherein the MIP mode information is related to an MIP mode applied to the current block and the MIP mode is used to derive an MIP matrix for the current block,
wherein the MIP matrix is derived based on (i) a width and a height of the current block and (ii) the MIP mode information, and
wherein the prediction samples for the current block are generated based on the MIP matrix.
3. An apparatus for transmitting data for an image, the apparatus comprising:
at least one processor configured to obtain a bitstream for the image, wherein the bitstream is generated based on determining whether a matrix-based intra prediction (MIP) is applied to a current block, generating prediction samples for the current block based on the determination that the MIP is applied to the current block, generating prediction-related information based on the determination that the MIP is applied to the current block, generating residual samples for the current block based on the prediction samples, generating residual information based on residual samples, encoding image information including the prediction-related information and the residual information; and
a transmitter configured to transmit the data comprising the bitstream,
wherein the prediction-related information includes flag information related to whether an intra prediction mode type for the current block is the MIP, wherein for the current block of which size is equal to 64×8, the flag information related to whether the intra prediction mode type for the current block is the MIP is included in the image information,
wherein whether the intra prediction mode type for the current block is the MIP is determined based on the flag information,
wherein a value of the flag information being equal to 1 is related to representing that the intra prediction mode type for the current block is the MIP, and a value of the flag information being equal to 0 is related to representing that the intra prediction mode type for the current block is not the MIP,
wherein based on the value of the flag information being equal to 1, the image information includes MIP mode information, wherein the MIP mode information is related to an MIP mode applied to the current block and the MIP mode is used to derive an MIP matrix for the current block,
wherein the MIP matrix is derived based on (i) a width and a height of the current block and (ii) the MIP mode information, and
wherein the prediction samples for the current block are generated based on the MIP matrix.