Picture partitioning-based coding method and device
An image decoding method performed by a decoding device according to the present disclosure comprises the steps of: receiving a bitstream containing at least one of segmentation information of a current picture and prediction information for a current block included in the current picture; deriving a first segmentation structure of the current picture, which is based on multiple tiles, on the basis of the segmentation information of the current picture including at least one of information of the number of width-parsing columns, information of the last width, information of the number of height-parsing rows, and information of the last height; deriving a block predicted for the current block, on the basis of the prediction information for the current block contained in one of the multiple tiles; and generating reconstruction samples for the current block on the basis of the predicted block.
1 . An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including partition information, prediction information and residual information from a bitstream;
deriving a plurality of tiles in a current picture based on the partition information, wherein the partition information includes information on a tile column width and information on a tile row height for an uniform tile spacing;
deriving prediction samples for a current block included in one tile of the plurality of tiles based on the prediction information;
deriving transform coefficients for the current block based on the residual information;
deriving residual samples for the current block based on the transform coefficients; and
generating reconstructed samples for the current block based on the prediction samples and the residual samples, wherein width values of tile columns that the uniform tile spacing is applied are derived based on the information on the tile column width,
wherein height values of tile rows that the uniform tile spacing is applied are derived based on the information on the tile row height, and
wherein the information on the tile column width and the information on the tile row height are included in a picture parameter set (PPS).
2 . An image encoding method performed by an encoding apparatus, the method comprising:
partitioning a current picture into a plurality of tiles;
generating partition information for the current picture based on the plurality of tiles, wherein the partition information includes information on a tile column width and information on a tile row height for an uniform tile spacing;
deriving prediction samples by performing a prediction on a current block included in one tile of the plurality of tiles;
generating prediction information related to the prediction for the current block;
deriving residual samples for the current block based on the prediction samples;
generating residual information related to the residual samples; and
encoding image information including the partition information, the prediction information, and the residual information,
wherein width values of tile columns that the uniform tile spacing is applied are derived based on the information on the tile column width,
wherein height values of tile rows that the uniform tile spacing is applied are derived based on the information on the tile row height, and
wherein the information on the tile column width and the information on the tile row height are included in a picture parameter set (PPS).
3 . A transmission method of data for an image, the method comprising:
obtaining a bitstream for the image, wherein the bitstream is generated based on partitioning a current picture into a plurality of tiles;
generating partition information for the current picture based on the plurality of tiles, wherein the partition information includes information on a tile column width and information on a tile row height for an uniform tile spacing;
deriving prediction samples by performing a prediction on a current block included in one tile of the plurality of tiles;
generating prediction information related to the prediction for the current block;
deriving residual samples for the current block based on the prediction samples;
generating residual information related to the residual samples; and
encoding image information including the partition information, the prediction information, and the residual information, and
transmitting the data comprising the bitstream to an image decoding apparatus,
wherein width values of tile columns that the uniform tile spacing is applied are derived based on the information on the tile column width,
wherein height values of tile rows that the uniform tile spacing is applied are derived based on the information on the tile row height, and
wherein the information on the tile column width and the information on the tile row height are included in a picture parameter set (PPS).