Method and apparatus for encoding/decoding video using split layer
The present invention relates to a method and an apparatus for encoding/decoding a video using a split layer. The video encoding/decoding method generates an encoded image data by encoding a current block partitioned into a plurality of subblocks, generates an encoded partition information data by encoding partition information of the current block, generates a bitstream including the encoded image data and the encoded partition information data, and then reconstructs the video image from the generated bitstream. According to the present disclosure, when encoding a high resolution video with variable sized blocks, various block shapes may be used for the encoding, and efficient encoding and decoding of the block partition information can improve the compression efficiency.
1. A method performed by a video encoding apparatus for encoding a video in a unit of blocks, the method comprising:
encoding, into a bitstream, a first information indicating a minimum block size and a second information indicating an enlarging ratio relative to the minimum block size; and
dividing a square current block having a maximum block size into one or more subblocks which are equal to or larger than the minimum block size by a tree structure, and encoding, into the bitstream, partition information of the current block divided by the tree structure, wherein the maximum block size is identical to a size enlarged from the minimum block size by the enlarging ratio,
wherein the encoding of the partition information comprises:
encoding, into 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,
wherein the partition flag indicating whether a node, which corresponds to a block having the minimum subblock size, is divided is not encoded into 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 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 encoded by a binary arithmetic coding.
5. A video encoding apparatus of encoding a video in a unit of blocks, the apparatus comprising a microprocessor configured to:
encode, into a bitstream, a first information indicating a minimum block size and a second information indicating an enlarging ratio relative to the minimum block size;
divide a square current block having a maximum block size into one or more subblocks which are equal to or larger than the minimum block size by a tree structure, wherein the maximum block size is identical to a size enlarged from the minimum block size by the enlarging ratio, and
encode, into the bitstream, partition information related to dividing the current block into the one or more subblocks,
by encoding 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 s wherein the partition flag indicating whether a node, which corresponds to a block having the minimum subblock size, is divided is not encoded into 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 encoded by a binary arithmetic coding.