Method and apparatus for encoding/decoding video using split layer
A method performed by an apparatus of decoding a video in the unit of blocks, includes: extracting and decoding a first information corresponding to a minimum block size and a second information corresponding to a difference between the minimum block size and a maximum block size, from a bitstream; calculating the maximum block size based on the first information corresponding to the minimum block size and the second information corresponding to the difference; decoding, from the bitstream, partition information of a square current block having the derived maximum block size to identify one or more subblocks in the current block which have sizes equal to or larger than the minimum block size; decoding a prediction mode information of each of the subblocks, the prediction mode information indicating whether a subblock is inter-predicted or intra-predicted; and reconstructing each of the subblocks in the current block by predicting each of the subblocks.
1. A method of decoding a video in the unit of blocks at a video decoding apparatus, the method comprising:
extracting and decoding a first information indicating a minimum block size and a second information indicating an enlarging ratio relative to the minimum block size, from a bitstream encoded by a video encoding apparatus, wherein the first and second information are values of log scale;
setting a maximum block size to a size enlarged from the minimum block size by the enlarging ratio, and setting a size of a square current block to be decoded as the maximum block size; and
reconstructing one or more subblocks in the current block which has the maximum block size, by decoding, from the bitstream, partition information of the current block by a tree structure, wherein the subblocks in the current block have sizes equal to or larger than the minimum block size,
wherein the decoding of the partition information comprises:
reconstructing, from the bitstream, a partition flag indicating whether or not each node of the tree structure, starting from a node of an uppermost layer corresponding to the current block, is divided into four nodes of a lower layer; and
identifying blocks corresponding to nodes which are not further divided as the subblocks in the current block,
wherein the partition flag indicating whether a node, which corresponds to a block having the minimum subblock size, is divided is not included in the bitstream.
2. The method of claim 1 , wherein the maximum block size is determined from among 16*16, 32*32 and 64*64.
3. The method of claim 1 , wherein when a node of the tree structure is divided into nodes of a lower layer, a block corresponding to the node is divided into four equal-sized square blocks corresponding to the nodes of the lower layer.
4. The method of claim 1 , wherein the partition flag is decoded by a binary arithmetic coding.
5. A video decoding apparatus of decoding a video in the unit of blocks, the apparatus comprising a microprocessor configured to:
extract and decode a first information indicating a minimum block size and a second information indicating an enlarging ratio relative to the minimum block size, from a bitstream encoded by a video encoding apparatus, wherein the first and second information are values of log scale,
set a maximum block size to a size enlarged from the minimum block size by the enlarging ratio, and set a size of a square current block to be decoded as the maximum block size; and
reconstructing one or more subblocks in the current block which has the maximum block size, by decoding, from the bitstream, partition information of the current block by a tree structure, wherein the subblocks in the current block have sizes equal to or larger than the minimum block size,
wherein the microprocessor is configured to decode the partition information by:
reconstructing, from the bitstream, a partition flag indicating whether or not each node of the tree structure, starting from a node of an uppermost layer corresponding to the current block, is divided into four nodes of a lower layer; and
identifying blocks corresponding to nodes which are not further divided as the subblocks in the current block,
wherein the partition flag indicating whether a node, which corresponds to a block having the minimum subblock size, is divided is not included in the bitstream.
6. The apparatus of claim 5 , wherein the maximum block size is determined from among 16*16, 32*32 and 64*64.
7. The apparatus of claim 5 , wherein when a node of the tree structure is divided into nodes of a lower layer, a block corresponding to the node is divided into four equal-sized square blocks corresponding to the nodes of the lower layer.
8. The apparatus of claim 5 , wherein the partition flag is decoded by a binary arithmetic coding.