Intra prediction method and device
The present invention relates to an intra prediction method and apparatus. The image decoding method according to the present invention may comprise decoding information on intra prediction; and generating a prediction block by performing intra prediction for a current block based on the information on intra prediction. The information on intra prediction may include information on an intra prediction mode, and the intra prediction mode may include a curved intra prediction mode.
1. A decoding apparatus for image decoding, the apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain a coding block by partitioning an image;
determine whether a size of the coding block belongs to a predetermined range;
determine a split type for the coding block based on whether the size of the coding block belong to the predetermined range;
derive a current block split from the coding block based on the split type for the coding block; and
reconstruct the current block,
wherein based on that the size of the coding block belongs to the predetermined range, the split type for the coding block represents that the coding block is split into two or four equal-sized subblocks based on quad-tree split or binary-tree split,
wherein based on that the size of the coding block is equal to a first size, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized subblocks, and
wherein based on that the size of the coding block is equal to a second size, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.
2. The apparatus of claim 1 , wherein based on that the size of the coding block is 128×128 or 256×256, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized sub-blocks.
3. The apparatus of claim 1 , wherein based on that the size of the coding block is 16×16, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.
4. An encoding apparatus for image encoding, the apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain a coding block by partitioning an image;
determine whether a size of the coding block belongs to a predetermined range;
determine a split type for the coding block based on whether the size of the coding block belong to the predetermined range;
derive a current block split from the coding block based on the split type for the coding block, encode information for the current block,
wherein based on that the size of the coding block belongs to the predetermined range, the split type for the coding block represents that the coding block is split into two or four equal-sized subblocks based on quad-tree split or binary-tree split,
wherein based on that the size of the coding block is equal to a first size, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized subblocks, and
wherein based on that the size of the coding block is equal to a second size, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.
5. The apparatus of claim 4 , wherein based on that the size of the coding block is 128×128 or 256×256, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized sub-blocks.
6. The apparatus of claim 4 , wherein based on that the size of the coding block is 16×16, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.
7. An apparatus for transmitting image data, the apparatus configured to:
obtain a bitstream generated based on an image encoding method, wherein the image encoding method comprises obtaining a coding block by partitioning an image, determining whether a size of the coding block belongs to a predetermined range, determining a split type for the coding block based on whether the size of the coding block belong to the predetermined range, deriving a current block split from the coding block based on the split type for the coding block, and encoding information for the current block; and
transmit the image data comprising the bitstream,
wherein based on that the size of the coding block belongs to the predetermined range, the split type for the coding block represents that the coding block is split into two or four equal-sized subblocks based on quad-tree split or binary-tree split,
wherein based on that the size of the coding block is equal to a first size, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized subblocks, and
wherein based on that the size of the coding block is equal to a second size, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.
8. The apparatus of claim 7 , wherein based on that the size of the coding block is 128×128 or 256×256, the split type for the coding block is implicitly determined as that the coding block is split into the four equal-sized sub-blocks.
9. The apparatus of claim 7 , wherein based on that the size of the coding block is 16×16, the split type for the coding block is implicitly determined as that the coding block is split into the two equal-sized sub-blocks.