Samsung Electronics Co., Ltd.

Tencent America LLC

Anish Tamse

Minwoo Park

Minsoo Park

Seungsoo Jeong

Kiho Choi

Yinji Piao

Narae Choi

Woongil Choi

Gahyun Ryu

Chanyul Kim

Jin-young Lee

Yin-Ji Piao

Yumi Sohn

Yin-ji Piao

Shan Liu

Elena Alshina

Min-woo Park

Kwangpyo Choi

Xiang Yang Li

Alexander Alshin

Woong-il Choi

Seung-soo Jeong

Xiaozhong Xu

Guichun Li

Xiang Li

Ki-ho Choi

Jinyoung Lee

Provided are a video decoding method and apparatus which, during video encoding and decoding processes, determine whether a current block is in contact with an upper boundary of a largest coding unit including the current block, when it is determined that the current block is in contact with the upper boundary of the largest coding unit, determine an upper reference line of the current block as one reference line, when it is determined that the current block is not in contact with the upper boundary of the largest coding unit, determine the upper reference line of the current block based on N reference lines, and use the determined upper reference line.

Method and device for video decoding, and method and device for video encoding

An image decoding method may include: obtaining, from a sequence parameter set of a bitstream, information indicating a plurality of first reference image lists for an image sequence including a current image; obtaining, from a group header of the bitstream, an indicator for a current block group including a current block in the current image; obtaining a second reference image list by modifying a first reference image list indicated by the indicator, from among the plurality of first reference image lists, into the second reference image list; and prediction-decoding a lower block of the current block based on a second reference image included in the second reference image list.

Apparatuses for encoding and decoding image, and methods for encoding and decoding image thereby

Provided is an image decoding method including determining a plurality of coding units in a chroma image by hierarchically splitting the chroma image, based on a split shape mode of blocks in the chroma image of a current image, and decoding the current image, based on the plurality of coding units in the chroma image. In this regard, the determining of the plurality of coding units in the chroma image may include, when a size or an area of a chroma block from among a plurality of chroma blocks to be generated by splitting a current chroma block in the chroma image is equal to or smaller than a preset size or a preset area, not allowing splitting of the current chroma block based on a split shape mode of the current chroma block, and determining at least one coding unit included in the current chroma block.

Method and apparatus for image encoding, and method and apparatus for image decoding

A video decoding method includes, determining a center motion vector of a current block by using a base motion vector of the current block based on affine model-based inter-prediction being performed in the current block, determining a reference range of an area to be referred to, with respect to the current block, based on a size of the current block, based on a reference area having a size of the reference range with respect to a point in a reference picture of the current block, the point being indicated by a central motion vector of the current block, deviating from or including a boundary of the reference picture, changing the reference area by parallelly translating the reference area into a current picture, and determining prediction samples of sub-blocks of the current block in the changed reference area from the reference picture.

Video decoding method and apparatus, and video encoding method and apparatus for performing inter prediction according to affine model

Provided is a video decoding method including obtaining identification information of a first tile and identification information of a last tile from a bitstream, wherein the first and last tiles are included in a first slice, determining an index difference between the first tile and the last tile, based on a result of comparing the identification information of the first tile with the identification information of the last tile, determining the number of tiles included in the first slice, by using the index difference between the first tile and the last tile, and decoding a plurality of tiles included in the first slice according to an encoding order by using the number of tiles included in the first slice, the identification information of the first tile, and the identification information of the last tile.

Video encoding method and decoding method using tiles and slices, and video encoding device and decoding device using tiles and slices

An image decoding method including: obtaining, from a bitstream, information related to a triangle prediction mode for a current block; splitting the current block into two triangular partitions, according to the information related to a triangle prediction mode; generating a merge list for a triangle prediction mode, according to a merge list generation method in a regular merge mode; selecting a motion vector for the two triangular partitions according to information indicating the motion vector from among motion vectors included in the merge list; obtaining, from a reference image, prediction blocks corresponding to the two triangular partitions, based on the motion vector; and reconstructing the current block, based on a final prediction block.

Image encoding device and image decoding device using triangular prediction mode, and image encoding method and image decoding method performed thereby

A video decoding method includes predicting a current block according to an intra prediction mode of the current block, determining whether to apply position dependent intra prediction filtering to the current block according to the intra prediction mode of the current block, when the position dependent intra prediction filtering is applied to the current block, determining at least one of an upper reference sample, a left reference sample, an upper weight, and a left weight for the position dependent intra prediction filtering of a current sample of the current block according to the intra prediction mode of the current block, and applying the position dependent intra prediction filtering to the current sample of the current block according to at least one of the upper reference sample, the left reference sample, the upper weight, and the left weight.

Encoding method and device thereof, and decoding method and device thereof

A video decoding method and device for determining whether a prediction mode of a current block is an affine mode; splitting, when the prediction mode of the current block is the affine mode, a luma block of the current block into a plurality of sub luma blocks having a square shape based on a predefined sub block size; determining a mean luma motion vector for four neighboring sub luma blocks among the plurality of sub luma blocks, by using a motion vector of an upper-left sub luma block of the four sub luma blocks and a motion vector of a lower-right sub luma block of the four sub luma blocks; determining the mean luma motion vector to be a motion vector of a current sub chroma block corresponding to the four sub luma blocks; and performing prediction on the current sub chroma block by using the determined motion vector, in a video encoding and decoding process are suggested.

Video decoding method and device, and video encoding method and device

Provided is a video decoding method including: determining an inter prediction mode of a current block when the current block is inter-predicted; determining at least one reference sample location to be referred to by the current block, based on the inter prediction mode of the current block; determining filter information to be applied to at least one reconstructed reference sample corresponding to the at least one reference sample location, based on the inter prediction mode of the current block; performing filtering on the at least one reconstructed reference sample, based on the filter information; and decoding the current block by using prediction samples generated via the filtering.

Encoding method and apparatus therefor, and decoding method and apparatus therefor

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Suwon-si, South Korea

Anish Tamse