Method for encoding/decoding using division information
A method and an apparatus for encoding/decoding an image according to the present invention may determine a reference area that is a pre-reconstructed area spatially adjacent to a current block on the basis of reference information for specifying the position of a reference area used for predicting a current block and may predict the current block on the basis of the reference area.
1. A method for decoding video data, with a decoding apparatus, the method comprising:
receiving, first division information indicating whether to divide a current block into a plurality of sub-blocks from a bitstream, the first division information being related to sub-block-based intra prediction;
dividing, in response to the first division information indicating that the current block is divided into the plurality of sub-blocks, the current block into the plurality of sub-blocks; and
obtaining, based on an intra prediction mode of the current block, a prediction block of the current block by performing the sub-block-based intra prediction in units of the sub-blocks,
wherein, based on second division information signaled from the bitstream, the current block is divided into the plurality of sub-blocks in only one of a vertical direction or a horizontal direction,
wherein a number of the plurality of sub-blocks resulting from dividing the current block is adaptively determined based on whether a size of the current block is less than a threshold size pre-defined in a decoding apparatus,
wherein, in response to the size of the current block being less than the threshold size, the number of the sub-blocks is determined equal to 2,
wherein, in response to the size of the current block being greater than or equal to the threshold size, the number of the sub-blocks is determined equal to 4, and
wherein the threshold size is defined as 8×8.
2. A method for encoding video data, with an encoding apparatus, the method comprising:
dividing a current block into a plurality of sub-blocks;
obtaining, based on an intra prediction mode of the current block, a prediction block of the current block by performing sub-block-based intra prediction in units of the sub-blocks; and
encoding first division information indicating whether to divide the current block into the plurality of sub-blocks into a bitstream, the first division information being related to the sub-block-based intra prediction,
wherein the current block is divided into the plurality of sub-blocks in only one of a vertical direction or a horizontal direction,
wherein, based on a division direction of the current block, second division information is encoded into the bitstream,
wherein a number of the plurality of sub-blocks resulting from dividing the current block is adaptively determined based on whether a size of the current block is less than a threshold size pre-defined in a encoding apparatus,
wherein, in response to the size of the current block being less than the threshold size, the number of the sub-blocks is determined equal to 2,
wherein, in response to the size of the current block being greater than or equal to the threshold size, the number of the sub-blocks is determined equal to 4, and
wherein the threshold size is defined as 8×8.
3. A method of transmitting a bitstream generated by an encoding method, the encoding method comprising:
dividing a current block into a plurality of sub-blocks;
obtaining, based on an intra prediction mode of the current block, a prediction block of the current block by performing sub-block-based intra prediction in units of the sub-blocks; and
encoding first division information indicating whether to divide the current block into the plurality of sub-blocks into the bitstream, the first division information being related to the sub-block-based intra prediction,
wherein the current block is divided into the plurality of sub-blocks in only one of a vertical direction or a horizontal direction,
wherein, based on a division direction of the current block, second division information is encoded into the bitstream,
wherein a number of the plurality of sub-blocks resulting from dividing the current block is adaptively determined based on whether a size of the current block is less than a threshold size pre-defined in an encoding apparatus,
wherein, in response to the size of the current block being less than the threshold size, the number of the sub-blocks is determined equal to 2,
wherein, in response to the size of the current block being greater than or equal to the threshold size, the number of the sub-blocks is determined equal to 4, and
wherein the threshold size is defined as 8×8.