Sk Telecom Company, Ltd.

Joong Gunn Park

Byeungwoo Jeon

Yunglyul Lee

Haekwang Kim

Joohee Moon

Jeongyeon Lim

Jongki Han

Juock Lee

Sungwon Lim

Jung Youp Yang

Ryeonghee Kwon

Hoyoung Lee

Kwanghyun Won

Jaehwan Kim

Mincheol Park

Jungyoup Yang

Hyun Wook Kim

Chanwon Seo

Seok Keon Lee

Oh Chan Kwon

A video encoding apparatus includes: an inter prediction unit to determine a motion parameter of a current block and generate a predicted block of the current block, by performing a motion estimation on the current block; and an optimal mode determining unit to set a prediction mode of the current block as a SKIP mode when (i) the motion parameter of the current block is identical to a motion parameter of a candidate block among a plurality of candidate blocks and (ii) all-zero coefficients result from a transform and a quantization performed on a residual data block representing the difference between the current block and the predicted block.

Method and apparatus for encoding and decoding video using skip mode

A video decoding method performed by a video decoding apparatus includes: generating a quantized frequency transform block by decoding a bitstream; reconstructing a residual block by inversely quantizing and inversely transforming the quantized frequency transform block; generating a prediction block corresponding to a current block; reconstructing the current block by adding the generated prediction block to the reconstructed residual block; and performing a deblocking filtering with respect to a boundary between subblocks within a frame including the reconstructed current block, by allowing numbers of filtered pixels in a first block of the subblocks and a second block of the subblocks that engage in the filtering to be different depending on one or more predetermined criterion.

Encoding/decoding apparatus and method using flexible deblocking filtering

An apparatus for encoding images includes: a predictor to determine a prediction unit (PU) mode among a plurality of PU modes indicating types of partition of a current coding unit (CU) into one or more prediction units (PUs), and generate a predicted block of the current CU by performing an intra prediction or an inter prediction for each PU of the determined PU mode, wherein a size of the current CU is 2N&#xd7;N, and the plurality of PU modes includes 2N&#xd7;hN or hN&#xd7;N PU mode in which the current CU is partitioned into PUs respectively having a size of 2N&#xd7;hN or hN&#xd7;N, h being a fractional number smaller than 1; a subtractor to subtract the predicted block from the current CU to generate a residual block; a transformer to transform the residual block into a frequency domain to generate a frequency one or more transform blocks.

Method and apparatus for effective encoding/decoding using detailed predictive unit

An apparatus for encoding images includes: a predictor to determine a prediction unit (PU) mode among a plurality of PU modes indicating types of partition of a current coding unit (CU) into one or more prediction units (PUs), and generate a predicted block of the current CU by performing an intra prediction or an inter prediction for each PU of the determined PU mode, wherein a size of the current CU is 2N&#xd7;2N, and the plurality of PU modes includes 2N&#xd7;hN or hN&#xd7;2N PU mode in which the current CU is partitioned into PUs respectively having a size of 2N&#xd7;hN or hN&#xd7;2N, h being a fractional number smaller than 1; a subtractor to subtract the predicted block from the current CU to generate a residual block; a transformer to transform the residual block into a frequency domain to generate a frequency one or more transform blocks.

A video encoding apparatus includes: a predictor to generate a predicted block of a current block corresponding to a predicted motion vector and a differential motion vector; and an entrophy encoder to encode an index for use in identifying the predicted motion vector of the current block and the differential motion vector in a bitstream, where the predicted motion vector of the current block corresponds to a motion vector identified by the index in an inter prediction mode, and where the index corresponds to at least one of representative blocks determined using neighboring blocks of the current block, in consideration of priorities of block positions.

Method and apparatus for predictive encoding/decoding of motion vector

A video encoding method includes: when an inter prediction mode corresponds to a merge mode, checking for whether predetermined candidate adding conditions are satisfied; adding into a merge candidate set including merge candidates corresponding to neighboring blocks of a current block, a combined bi-predictive motion parameter, the combined bi-predictive motion parameter generated by combining a list 0 motion parameter of a first available candidate block and a list 1 motion parameter of a second available candidate block, when the predetermined candidate adding conditions are satisfied; and predicting the current block in the merge mode by using a motion parameter corresponding to a merge candidate selected from the merge candidate set, to generate a predicted block for the current block, wherein the merge candidate set corresponds to a maximum number of the merge candidates, the maximum number of the merge candidates corresponding to information on the number of the merge candidates.

Method and apparatus for video encoding/decoding using improved merge

A video decoding method includes decoding a bitstream including generating a quantized frequency transform block from the bitstream, reconstructing a residual block by inversely quantizing and inversely transforming the quantized frequency transform block, generating a prediction block by predicting a current block to be reconstructed, reconstructing the current block by adding the generated prediction block to the reconstructed residual block and performing a deblocking filtering with respect to a boundary between subblocks within a frame including the reconstructed current block, by allowing numbers of filtered pixels in a first block of the subblocks and a second block of the subblocks that engage in the filtering to be different depending on one or more predetermined criterion.

A video encoding method for reducing encoding error by using a loop filter is provided, the method including: generating a reconstructed image from encoded data of an original image; determining one or more regions on which the loop filter is applied in the reconstructed image; transforming the original image and the reconstructed image which correspond to each region of the determined one or more regions from a spatial domain into a frequency domain; determining loop filter coefficients for said each region by comparing the transformed original image and the transformed reconstructed image; loop-filtering the reconstructed image based on the loop filter coefficients for said each region; and encoding information on the loop filter coefficients for said each region.

Method and apparatus for encoding/decoding image by using adaptive loop filter on frequency domain using conversion

A video decoding apparatus for predicting a current block to be decoded, includes: a bitstream decoder to extract an index for use in identifying a predicted motion vector of the current block and a differential motion vector from a bitstream; and a predictor to generate a predicted block of the current block based on the predicted motion vector and the extracted differential motion vector, wherein the predicted motion vector of the current block is determined to be a motion vector identified by the extracted index in a motion estimation mode of an inter prediction mode, and wherein the extracted index corresponds to one or more representative blocks determined using neighboring blocks of the current block, in consideration of priorities of block positions.

A video encoding apparatus includes: a parameter calculator to calculate a brightness compensation parameter based on one or more first pixels adjacent to a current block and one or more second pixels adjacent to a motion prediction block obtained by using a prediction motion vector, the one or more second pixels being located in locations corresponding to the one or more first pixels; a target pixel selector to select one or more target pixels for a brightness compensation from pixels in a prediction block determined by a motion vector of the current block, by using pixels adjacent to the motion prediction block; and a predictive encoder to generate a compensated prediction block of the prediction block by applying the brightness compensation parameter to the selected one or more target pixels and to perform a predictive encoding on the generated compensated prediction block.

Apparatus and method for coding and decoding image

A video encoding apparatus for predicting a motion vector of a current block to be encoded is to determine one or more representative blocks from neighboring blocks of the current block according to priorities of the neighboring blocks; and encode the motion vector of the current block by using, as a predicted motion vector of the current block, a first motion vector selected from motion vectors of the determined one or more representative blocks and a second motion vector of at least one block within a reference picture.

A video decoding method includes: extracting a merge flag and a merge index from a bitstream; when the merge flag indicates a merge mode, checking for whether predetermined candidate adding conditions are satisfied, and adding into a merge candidate set including the merge candidates corresponding to neighboring blocks of a current block, a combined bi-predictive motion parameter, the combined bi-predictive motion parameter generated by combining a listmotion parameter of a first available candidate block and a listmotion parameter of a second available candidate block, when the predetermined candidate adding conditions are satisfied; and generating a predicted block of the current block by using a motion parameter corresponding to a merge candidate selected from the merge candidate set, the merge candidate selected by the extracted merge index.

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Suwon Si, South Korea

Joong Gunn Park