Sk Telecom Company, Ltd.

Hyoungmee Park

Byeungwoo Jeon

Joohee Moon

Yunglyul Lee

Haekwang Kim

Jeongyeon Lim

Juock Lee

Jongki Han

Jinhan Song

Kibaek Kim

Dongwon Kim

Sunyeon Kim

Mincheol Park

Chanwon Seo

Daeyeon Kim

Min Jae Kim

Hayoon Kim

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.

Video encoding/decoding method using motion information candidate group for batch mode

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.

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.

A video decoding apparatus includes: a decoder to determine a size of a minimum block unit among block units in which quantization parameter information is decoded from a bitstream, determine a current block to be decoded by dividing a block larger than 16&#xd7;16 into one or more blocks, decode, from the bitstream, a skip information and the motion information for deriving the motion vector of the current block without decoding information on residual signals of the current block, and decode, from the bitstream, prediction information of the current block and quantized transform coefficients of the current block; and a video reconstructor to determine the motion vector of the current block using the decoded motion information, reconstruct residual signals from the quantized transform coefficients by inversely quantizing the quantized transform coefficients using a quantization parameter, and reconstruct the current block based on the prediction information and the reconstructed residual signals.

Video encoding/decoding apparatus and method

A video encoding/decoding apparatus and method are disclosed. The video encoding/decoding apparatus includes: a video encoder for encoding a differential value between a quantization parameter value of a macroblock of a video and a quantization parameter value of a subblock in an extended macroblock based on additional information on the macroblock and the subblock; and a video decoder for reconstructing a differential value of a quantization parameter encoded by the video encoder, reconstructing a residual block based on a reconstructed differential value of the quantization parameter, and reconstructing the video based on the residual block reconstructed.

Image encoding/decoding device and method

Video encoding/decoding apparatus includes video encoder and video decoder. Video encoder generates predicted subblocks by predicting subblocks into which macroblock is divided, generates residual subblocks by subtracting predicted subblocks from subblocks, generates quantized transform coefficients by transforming and quantizing residual subblocks by using transform selected according to size of subblock, generates encoded video data by encoding quantized transform coefficients, and selectively calculates and determines encoding cost when determining encoding mode for at least one of motion vector, transform type, prediction mode, and block type for subblocks. Video decoder reconstructs partition type information, motion information, transform type information, and quantized transform coefficients by decoding encoded data, reconstructs residual subblocks by inverse-quantizing and inverse-transforming quantized transform coefficients by using transform identified by transform type information, generates predicted subblocks by predicting subblocks identified according to partition type information by using motion information, and reconstructs subblocks by adding predicted subblocks and residual subblocks.

Video encoding/decoding apparatus and method using motion information candidate group for batch mode

A method performed by a motion vector encoding apparatus for encoding a motion vector includes: determining a first motion vector and a second motion vector relating to a current block to be encoded; determining predicted motion vectors of the first motion vector and the second motion vector, respectively; calculating a first differential motion vector and a second differential motion vector; the first differential motion vector corresponding to a difference between the first motion vector and the predicted motion vector of the first motion vector, the second differential motion vector corresponding to a difference between the second motion vector and the predicted motion vector of the second motion vector; and encoding the first differential motion vector and the second differential motion vector, wherein the first motion vector and the second motion vector have different resolutions.

Method and device for encoding/decoding motion vector

A video encoding apparatus using a tree structure, includes: a splitter to generate a partition flag indicating whether each block, starting from a block corresponding to an uppermost layer of the tree structure, is divided into four blocks of a lower layer; and an encoder to encode, into a bitstream, the partition flag and prediction type information on a block which is not further divided in the tree structure, wherein, when a block of a first layer is divided into four blocks of a second layer which is a lower layer of the first layer, the encoder is configured to encode the partition flag for each of the four blocks of the second layer in a predetermined order.

Method and apparatus for encoding/decoding image using variable-size macroblocks

A video decoding apparatus for reconstructing residual signals of a current block to be decoded by using a tree structure, includes: a decoder to decode, from a bitstream, prediction type information on the current block to be decoded, and divide, by the tree structure, the current block into one or more subblocks of which information on residual signals is to be reconstructed, by decoding, from the bitstream, a partition flag which indicates whether a block corresponding thereto is divided into blocks of a lower layer in the tree structure, wherein blocks which are not further divided are identified as the subblocks of which information on the residual signals is to be reconstructed; and a reconstructor to reconstruct information on residual signals of each of the subblocks from the bitstream.

Growing community of inventors

Suwon-si, South Korea

Hyoungmee Park