Sk Telecom Company, Ltd.

Jaehoon Choi

Jeongyeon Lim

Sunyeon Kim

Gyumin Lee

Byeungwoo Jeon

Haekwang Kim

Joohee Moon

Yunglyul Lee

Jongki Han

Dongwon Kim

Yoonsik Choe

Yonggoo Kim

Yungho Choi

Daeyeon Kim

Jinwoo Jeong

Sungwook Hong

Jeonghoon Seo

Juock Lee

Jechang Jeong

Chanwon Seo

Kioh Kim

Youngjoe Yoo

Disclosed is a method for encoding a motion vector by using spatial division, the method comprises: aggregating predicted motion vector candidates of a current block into a plurality of groups; selecting representative predicted motion vectors for respective groups by selecting one of aggregated predicted motion vector candidates within the respective groups as representative predicted motion vector; selecting single representative predicted motion vector from the representative predicted motion vectors for the respective groups as a predicted motion vector; and encoding a differential vector representing difference between a current motion vector of the current block and a selected predicted motion vector.

Method and apparatus for motion vector encoding/decoding using spatial division, and method and apparatus for image encoding/decoding using same

An apparatus for encoding image information using a tree structure, performs a method by: encoding a partition flag indicating whether each node, starting from a node of an uppermost layer of the tree structure, is divided into nodes of a lower layer; encoding image information of a block corresponding to a node which is not further divided; and encoding additional information including first information on a minimum block size and second information on a difference between the minimum block size and a maximum block size, the difference between the minimum block size and the maximum block size being a value of a log scale, wherein the first and second information are used for identifying the maximum block size corresponding to the node of the uppermost layer.

Encoding/decoding method and apparatus using a tree structure

A method for reconstructing information on transform coefficients of a current block by a tree structure, includes: decoding a bitstream to reconstruct information on a size of the current block and information on a minimum subblock size; determining the size of the current block based on the information on the size of the current block; determining the minimum subblock size based on the information on the minimum subblock size; and reconstructing the information on transform coefficients of each of one or more subblocks by dividing the current block in the determined size into the one or more subblocks by the tree structure, wherein the current block is divided into the subblocks which are not smaller than the minimum subblock size.

A method for reconstructing image information divided by a tree structure from a bitstream, includes: decoding the bitstream to reconstruct additional information, the additional information including first information on a minimum block size and second information on a difference between the minimum block size and a maximum block size, wherein the difference between the minimum block size and the maximum block size is a value of a log scale; reconstructing a partition flag indicating whether or not each node, starting from a node of an uppermost layer of the tree structure, is divided into nodes of a lower layer, the node of the uppermost layer identified based on the first and second information; and reconstructing image information of a block corresponding to a node which is not further divided.

The present disclosure relates to a method and apparatus for interpolating a reference picture and a method and apparatus for encoding/decoding a video using the same. The apparatus for interpolating the reference picture selects a plurality of filters for interpolating the reference picture and generates a reference picture having a target precision through a multi-stage filtering of the reference picture by using a plurality of filters. The compression efficiency of the video may be improved by interpolating a reference picture through the determination of a filter of a filter coefficient for interpolating the reference picture according to characteristics of the video and interpolating the reference picture through a multi-stage filtering or adaptively changing resolutions of motion vectors in the unit of predetermined areas.

Method and apparatus for interpolating reference picture and method and apparatus for encoding/decoding image using same

The present disclosure relates to an inter prediction method and apparatus using adjacent pixels, and a video encoding method and apparatus using the same. The inter prediction method for a predictive encoding includes: determining a current motion vector by estimating a motion of a current block; generating a reference block indicated by the current motion vector; calculating a motion compensation coefficient or an average compensation coefficient by using pixels neighboring the current block and pixels neighboring reference block; generating a changed reference block reflecting the motion compensation coefficient or the average compensation coefficient in the reference block; and determining the changed reference block as a predicted block of the current block. The present disclosure reduces a difference between an actual block and a predicted block by more accurately predicting the block to be encoded, thereby improving the compression efficiency.

Inter prediction method and apparatus using adjacent pixels, and image encoding/decoding method and apparatus using same

The present disclosure relates to extracting correlation parameters between color planes for prediction by extracting optimum correlation parameters between the color planes using neighboring blocks when a prediction screen is generated through the use of the correlation between the color planes in video encoding. The technology includes neighboring block searching unit responsive to a second block of a reconstructed previous plane corresponding to a first block to be encoded of a current plane, for searching for a third block belonging to neighboring blocks of the second block and having smallest difference in pixel value from the second block; correlation parameter calculator for calculating correlation parameters between the third block and a fourth block reconstructed of the current plane and corresponding to the third block, based on the third block and the fourth block, and predictor for predicting the first block based on the second block and calculated correlation parameters.

Device and method for extracting correlation parameters between colour planes for prediction, and a recording medium for the same

The present disclosure provides a motion vector encoding/decoding method and apparatus using a motion vector resolution combination, and an image encoding/decoding method and apparatus using the same. A motion vector encoding apparatus include: an encoding cost calculator for calculating an encoding cost according to a motion vector resolution for each motion vector resolution combination including one or more motion vector resolutions; a resolution combination determiner for selecting a motion vector resolution combination by using the encoding cost calculated for each motion vector resolution combination; and a motion information encoder for outputting encoded motion vector data generated by encoding a motion vector determined according to the motion vector resolution combination selected, as a bitstream. Accordingly, an efficient motion vector resolution combination is selected adaptively and a motion vector is determined and decoded based on the motion vector resolution combination, thus making it possible to improve compression efficiency.

Motion vector encoding/decoding method and apparatus using a motion vector resolution combination, and image encoding/decoding method and apparatus using same

A video encoding apparatus using an inter-prediction includes: a video encoder to determine a current motion vector of a current block, predict the current block by using the determined current motion vector, and encode a residual block representing a difference between the predicted block and the current block; and a motion vector encoder to determine a candidate predicted motion vector set based on motion information of neighboring blocks of the current block, select a predicted motion vector of the current motion vector from among the two candidate predicted motion vectors in the candidate predicted motion vector set, and encode a differential vector representing a difference between the current motion vector and the selected predicted motion vector and a predicted motion vector index indicating the selected predicted motion vector among the two candidate predicted motion vectors.

Method and apparatus for encoding/decoding a motion vector by selecting a set of predicted candidate motion vectors, and method and apparatus for image encoding/decoding using the same

The present disclosure provides a video encoding apparatus and encoding method thereof, video decoding apparatus and decoding method thereof, and directional intra-prediction method to be used therefor. The video encoding apparatus includes a main mode search unit for searching for main mode for a current block from among directional intra-prediction modes; a sub mode search unit for searching for sub modes formed by inclining indicated orientation of found main mode by main mode search unit by a predetermined offset in both clockwise and counterclockwise directions; a predicted block generator for generating predicted block of the current block from neighboring blocks of the current block based on found main mode by the main mode search unit and found sub modes by the sub mode search unit; a differentiator for calculating differential between the current block and the predicted block; and an encoder for encoding calculated differential by the differentiator.

Video encoding device and encoding method thereof, video decoding device and decoding method thereof, and directional intra-prediction method to be used thereto

A method of encoding a motion vector includes: selecting one of a plurality of predicted candidate motion vector sets by using motion information of neighboring blocks of a current block; selecting one of predicted candidate motion vectors within a selected predicted candidate motion vector set, as a predicted motion vector; encoding a differential motion vector representing a difference between a current motion vector or motion vector of the current block and a selected predicted motion vector; and encoding a predicted motion vector index indicating the selected predicted motion vector. As a motion vector is encoded after selecting an efficient predicted candidate motion vector set, the size of a differential vector to be encoded can be reduced without necessarily encoding additional information to indicate which set of predicted candidate motion vectors has been selected, resulting in improved compression efficiency of motion vectors and in turn the improved video compression efficiency.

The present disclosure provides an encoding/decoding method using a tree structure. The encoding method for encoding image information includes: grouping predetermined areas having the image information into a plurality of groups, and generating a node value of each layer up to an uppermost layer by determining a minimum value or a maximum value of information to be encoded within grouped areas as information on the grouped areas; and encoding a difference value between the node value of each layer and a node value of an upper layer or a difference value between the node value of each layer and a value determined based on a preset criterion. Accordingly, the encoding efficiency and in turn the video compression efficiency are improved by using the tree structure in the encoding of various pieces of image information and the decoding of the resultant encoded data.

Encoding / decoding method and apparatus using a tree structure

An apparatus for encoding image information using a tree structure performs a method by: encoding a partition flag indicating whether each node, starting from a node of an uppermost layer of the tree structure, is divided into nodes of a lower layer; encoding image information of a block corresponding to a node which is not further divided; and encoding additional information including first information on a minimum block size and second information on a difference between the minimum block size and a maximum block size, wherein the first and second information are used for identifying the maximum block size corresponding to the node of the uppermost layer.

The present disclosure relates to technology for generating an efficient predicted image by using a correlation between color planes in encoding of a multi-plane video. An apparatus for encoding a multi-plane video including two or more color planes by using a bi-prediction includes: an intra-predictor for generating a first predicted block by performing an intra-prediction on a current block of a current plane; an inter-plane predictor for generating a second predicted block by performing an inter-plane prediction; a dual-plane predictor for generating a third predicted block based on the first predicted block and the second predicted block; an optimum mode determiner for selecting one optimum predicted block having a highest encoding efficiency from the first to third predicted blocks; and an encoder or a decoder for encoding or decoding the current block based on a selected optimum predicted block.

Apparatus and method for encoding/decoding multi-plane images using bi-prediction and recording medium using same

The present disclosure provides a video encoding/decoding method including: selectively frequency transforming a first residual block generated by subtracting a predicted block from a current block, generating a first quantized block for the first residual block or the frequency transformed first residual block, generating a second quantized block, if the first quantized block is a quantized first residual block from quantizing the first residual block, through selectively performing a secondary prediction on the quantized first residual block by using a secondary predicted motion vector set, encoding information on whether the frequency transforming is performed and selectively encoding information on the secondary prediction, encoding the first quantized block or the second quantized block into a bitstream, and decoding the same.

Growing community of inventors

Gyeonggi-do, South Korea

Jaehoon Choi