Sk Telecom Company, Ltd.

Juock Lee

Byeungwoo Jeon

Joohee Moon

Yunglyul Lee

Haekwang Kim

Jeongyeon Lim

Hyoungmee Park

Dongwon Kim

Sunyeon Kim

Jongki Han

Mincheol Park

Jinhan Song

Kibaek Kim

Joong Gunn Park

Sungwon Lim

Gyumin Lee

Jaehoon Choi

The present disclosure relates to a method and apparatus for improving the encoding efficiency by adaptively changing the resolution of the motion vector in the inter prediction encoding and inter prediction decoding of a video. The apparatus includes: a predicted motion vector calculator for calculating a predicted motion vector of a current block to be encoded using motion vectors of one or more surrounding blocks; and a skip mode encoder for encoding a result of performing a prediction of the current block and information indicating that the current block is a skip block when the predicted motion vector satisfies a skip condition, wherein at least one motion vector among the motion vectors of the surrounding blocks and the motion vector of the current block has a resolution different from resolutions of the other motion vectors.

Method and apparatus for encoding/decoding images using adaptive motion vector resolution

The present disclosure relates to a method and apparatus for improving the encoding efficiency by adaptively changing the resolution of the motion vector in the inter prediction encoding and inter prediction decoding of a video. The video encoding/decoding apparatus includes: a video encoder for determining a motion vector resolution of each area or motion vector of a video and performing an inter prediction encoding of the video by using a motion vector according to the motion vector resolution determined for each area or motion vector; and a video decoder for reconstructing a resolution by extracting resolution information from a bitstream, and then performing an inter prediction decoding by using a motion vector according to the motion vector resolution of each reconstructed area or motion vector.

A video encoding/decoding apparatus and method are disclosed. The video encoding/decoding apparatus includes: a video encoder for generating predicted subblocks by predicting subblocks into which macroblock is divided, generating residual subblocks by subtracting predicted subblocks from subblocks, generating quantized transform coefficients by transforming and quantizing residual subblocks by using transform selected according to subblock size, and generating encoded video data by using different context tables according to the macroblock and subblocks when using CABAC to encode the quantized transform coefficients; and a video decoder for reconstructing information of partition type, motion, transform type and quantized transform coefficients by decoding encoded data by using a CABAC and different context tables according to a macroblock and subblocks, reconstructing residual subblocks by inverse-quantizing/inverse-transforming the quantized transform coefficients by using a transform identified by the transform type information, generating predicted subblocks, reconstructing the subblocks, and reconstructing the macroblock based on the subblocks.

Video encoding/decoding apparatus and method using batch mode together with skip mode

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.

Method and apparatus for encoding/decoding video using split layer

A video encoding/decoding apparatus includes a video encoder for encoding block mode information indicating whether a block mode of a block to be encoded in a macroblock is a skip mode, partition mode information and skip motion information including index information, encoding at least one of transform type information, CBP information, and delta quantization parameter information of the block according to a combination of the block mode information and the partition mode information, and encoding coefficient information of the block based on the encoded information of the block, and a video decoder for decoding a bitstream to reconstruct block mode information indicating whether a block mode of a block to be decoded is a skip mode, partition mode information indicating whether block is divided into subblocks, and skip motion information including index information, and reconstructing block based on the reconstructed information by using reconstructed skip motion information.

Method for decoding images based on block mode information

A method performed by a video decoding apparatus, includes: identifying a current block to be decoded by dividing a maximum size block; decoding, from a bitstream, block mode information indicating whether a block mode of the current block to be decoded is a skip mode; when the block mode information indicates that the block mode of the current block is the skip mode, decoding, from the bitstream, a skip motion information of the current block and determining a motion vector of the current block based on the skip motion information, predicting the current block using the determined motion vector current block, and reconstructing the current block directly from the predicted block, without decoding information on residual signals of the current block from the bitstream.

Apparatus and method for encoding/decoding images

A method performed by a video encoding apparatus, includes: encoding block mode information indicating whether a block mode of a current block to be decoded is a skip mode; when the block mode of the current block is the skip mode, encoding a skip motion information of the current block without encoding information on residual signals of the current block, wherein the skip motion information is used for determining a motion vector of the current block; and when the block mode of the current block is not the skip mode, encoding prediction information of the current block, and encoding partition information of a tree structure related to dividing the current block into one or more subblocks, and thereby encoding information on residual signals of the subblocks.

A video decoding method, includes: reconstructing a syntax corresponding to at least one of a first block, a second block and a third block, wherein the first block is generated by dividing a frame for decoding, the second block corresponds to a unit of a prediction and is generated by dividing the first block, and the third block corresponds to a unit of transformation and is generated by dividing the first block in a tree structure; and reconstructing a prediction block corresponding to at least one of the first block, the second block and the third block, wherein the second block includes a batch mode flag for indicating whether a batch mode is used.

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Seoul, South Korea

Juock Lee