Sk Telecom Company, Ltd.

Joohee Moon

Byeungwoo Jeon

Yunglyul Lee

Haekwang Kim

Jeongyeon Lim

Jongki Han

Sunyeon Kim

Jinhan Song

Juock Lee

Dongwon Kim

Hyoungmee Park

HaYoon Kim

Mincheol Park

Daeyeon Kim

Jungyoup Yang

Kwanghyun Won

Kibaek Kim

Joong Gunn Park

Chanwon Seo

Gyumin Lee

Jaehoon Choi

Sungwook Hong

Hayoon Kim

Kioh Kim

Sungwon Lim

Jeong Pil Kim

Ryeonghee Kwon

Hyundong Kim

Hyemin Jun

Jeonghoon Seo

Donghoon Han

Jung Youp Yang

Jaehee Cho

Hoyoung Lee

Jaehwan Kim

Kihun Han

Jaehee Kwak

Dongkyun Kim

Min Jae Kim

Jie Jia

Youngjoe Yoo

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 provides a method and apparatus for subband-coding a frequency conversion unit and a video encoding/decoding method a video encoding/decoding apparatus using the same. The method and the apparatus for subband-coding the frequency conversion unit include generating an encoding stream by splitting the frequency conversion unit into one or more frequency domains, generating frequency domain encoding information according to whether there is a non-zero frequency coefficient in each frequency domain, scanning the frequency coefficient of each frequency domain to generate a frequency domain frequency coefficient stream, and binarizing and encoding the frequency domain encoding information and the scanned frequency domain frequency coefficient stream.

Method and device for subband coding frequency conversion unit, and method and device for image encoding/decoding using same

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 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 method performed by an apparatus for decoding a video, includes: generating a predicted block by predicting a current block to be decoded; reconstructing frequency coefficients in a frequency conversion unit by decoding a bitstream, to generate a frequency conversion block having a size of the frequency conversion unit; inversely transforming the frequency conversion block by using a transform size identical to the size of the frequency conversion unit, to reconstruct a residual block; and adding the reconstructed residual block to the predicted block.

A video decoding method using an inter prediction, includes: reconstructing a first differential motion vector and a second differential motion vector of a current block by decoding encoded data; deriving a first predicted motion vector and a second predicted motion vector of the current block from one or more neighboring blocks of the current block; generating a first motion vector of the current block by adding the first candidate motion vector to the first differential motion vector, and a second motion vector of the current block by adding the second candidate motion vector to the second differential motion vector; generating a predicted block of the current block by using the first and second motion vectors; reconstructing a residual block by decoding residual signals included in the encoded data; and adding each pixel value of the predicted block to a corresponding pixel value of the residual block.

Method and apparatus for encoding/decoding the motion vectors of a plurality of reference pictures, and apparatus and method for image encoding/decoding using same

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Seoul, South Korea

Joohee Moon