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 of decoding a video in 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;
setting a maximum block size to a size enlarged from the minimum block size by the enlarging ratio;
setting a size of a square current block to be decoded as the maximum block size and decoding, from the bitstream, partition information of a square current block having the maximum block size by a tree structure to thereby 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 from the bitstream, the prediction mode information indicating whether each of the subblocks is inter-predicted or intra-predicted;
and
reconstructing each of the subblocks in the current block by predicting each of the subblocks according to corresponding prediction mode information,
wherein the decoding of the partition information comprises:
reconstructing 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.
2. The method of claim 1 , wherein when a node is divided into one or more 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.
3. The method of claim 1 , wherein the partition flag is decoded by a binary arithmetic coding.