Lg Electronics Inc.

Samsung Electronics Co., Ltd.

Intellectual Discovery Co., Ltd.

Samsung Display Co., Ltd.

Samsung Electro-mechanics Co., Ltd.

Electronics and Telecommunications Research Institute

Kwangwoon University Industry-Academic Collaboration Foundation

Beijing Xiaomi Mobile Software Co., Ltd.

Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Dolby Laboratories Licensing Corporation

Vivo Mobile Communication Co., Ltd.

Vieworks Co., Ltd.

Imagis Co., Ltd.

Maru Lsi Co., Ltd.

Jung Hak Nam

Hyeong Moon Jang

Dong Gyu Sim

Nae Ri Park

Ling Li

Hyo Min Choi

Seung Hwan Kim

Sang Cheol Park

Hyun Ho Jo

Ha Hyun Lee

Jung Won Kang

Jin Seong Heo

Jin Soo Choi

Jin Woong Kim

Young Jun Park

Gug Rae Jo

Young Key Kim

Eun Sung Lee

Jaehyun Lim

Won Cheol Jung

Byung Hee Sohn

Hyung Ho Jo

Dae Young Lee

Jungeun Lee

Hae In Kim

Hendry Hendry

Sunmi Yoo Yoo

Mu Gyeom Kim

Seong Min Wang

Jea Won Lee

Tae Woo Kim

Byeong Hoon Cho

Doo Ho Yoo

Moonmo Koo

Jangwon Choi

Seung Won Park

Hyun Eok Shin

Yong Joo Lee

Gyung Min Baek

Joon Yong Park

Dae-Hwan Jang

Kang Soo Han

Sangwon Chae

Jung Il Kim

Moon Jung An

Heung Bok Ryu

Kyeong Hye Kim

Teack Yong Nam

Sung Gil Gu

Sangwook Lee

Jin Su Park

Seethal Paluri

Jae Hoon Lee

Dae-Young Lee

Hyun Joo Lee

Sang Gab Kim

Ji Hun Kim

Ki Hyun Kim

Joo Hyung Lee

Byung Du Ahn

Taewoo Kim

Yun Jong Yeo

Sang Won Shin

Jung-Eun Lee

Su Jin Choi

Gugrae Jo

Dae Hwan Jang

Yong Soo Kang

Eunji Kim

Ji-Yoon Park

Chunghyo Jung

Su Kyoung Yang

Seung In Baek

Hyung Bin Cho

Jin Young Bae

Eun Jung Kim

Yun Hee Lee

Kyoung Ryoul Seo

Youn Ho Han

Young Eun Park

Hyun Ji Ha

Jae Sun Lee

Sunmi Yoo

Ju Chul Park

Hyeon Hwan Kim

Hye Suk Jo

Yong Gun Lee

Sangik Bang

An image encoding/decoding apparatus and method are provided. An image decoding method performed by an image decoding apparatus according to the present disclosure may comprise deriving a motion shift of a current block using motion information of a neighboring block of the current block, determining a collocated block of the current block using the motion shift, deriving a motion vector for at least one control point (CP) of the determined collocated block, and deriving at least one control point motion vector (CPMV) of the current block using the motion vector for the at least one CP.

Image encoding/decoding method and device using affine TMVP, and method for transmitting bit stream

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a chroma array type of a current image, determining an adaptive loop filter (ALF) indicator of a chroma component based on the chroma array type, and performing ALF filtering with respect to a reconstructed image based on a value of the ALF indicator. The value of the ALF indicator may be determined to be a predetermined value without being obtained from a bitstream, based on the chroma array type being a predetermined type, and the value of the ALF indicator may be obtained from the bitstream, based on the chroma array type being not the predetermined type.

Image encoding/decoding method and device for signaling filter information on basis of chroma format, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method comprises determining whether a current entry in a reference picture list structure is an inter-layer reference picture (ILRP) entry, determining whether a current layer including a current picture has a plurality of direct reference layers, based on the current entry being the ILRP entry, acquiring a layer index of the current entry for a direct reference layer list from a bitstream, based on the current layer having a plurality of direct reference layers, and determining a direct reference layer including the current entry based on the layer index. The obtaining of the layer index may be skipped based on the current layer not having a plurality of direct reference layers.

Method and device for image encoding/decoding based on layer index of ILRP, and recording medium for storing bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise deriving a prediction sample of a current block based on motion information of the current block, determining whether prediction refinement with optical flow (PROF) applies to the current block, deriving, based on that the PROF applies to the current block, a difference motion vector for each sample position in the current block, deriving a gradient for each sample position in the current block, deriving a PROF offset based on the difference motion vector and the gradient, and deriving a refined prediction sample for the current block based on the PROF offset.

Image encoding/decoding method and device for performing prof, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a prediction mode of a current block, generating a prediction block of the current block based on intra block copy (IBC) prediction mode information, based on the prediction mode of the current block being an IBC prediction mode, determining a size of a transform block of the current block based on a color component of the current block, generating a residual block of the current block based on the size of the transform block; and reconstructing the current block based on the prediction block and the residual block of the current block.

Image encoding/decoding method and device using maximum transform size restriction of chroma component encoding block, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises deriving a first flag specifying whether to perform weighted prediction on a current block and a weight index BcwIdx of bi-prediction with CU-level weight (BCW) for the current block, determining whether to perform default weighted prediction or explicit weighted prediction on the current block based on the first flag and BcwIdx, and generating a prediction block for the current block by performing the determined method.

Image encoding/decoding method and device for performing prediction, and method for transmitting bitstream involving weighted prediction and bi-directional optical flow

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure comprises determining whether a prediction mode of a current block is an intra block copy (IBC) mode based on information on the prediction mode of the current block, based on the prediction mode of the current block being an IBC mode, deriving motion information of the current block based on motion information of a corresponding block corresponding to the current block, and generating a prediction block for the current block, by performing IBC prediction based on the derived motion information of the current block. Based on absence of motion information of the corresponding block, the motion information of the current block is derived based on default motion information.

Image encoding/decoding method and device using IBC prediction, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises deriving a prediction sample of a current block based on motion information of the current block, deriving a reference picture resampling (RPR) condition for the current block, determining whether prediction refinement with optical flow (PROF) applies to the current block based on the RPR condition, and deriving a refined prediction sample for the current block by applying PROF to the current block.

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a prediction mode of a current block, generating a prediction block of the current block based on inter prediction mode information, based on the prediction mode of the current block being an inter prediction mode, generating a residual block of the current block based on a transform block of the current block, and reconstructing the current block based on the prediction block and the residual block of the current bloc.

Method and apparatus for encoding/decoding video using maximum size limitation of chroma transform block, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises constructing a merge candidate list for a current block based on a prediction mode of the current block, deriving motion information of the current block based on the merge candidate list, and generating a prediction block of the current block based on the motion information. Information on a maximum number of merge candidates included in the merge candidate list may be obtained through a sequence parameter set, and, based on the prediction mode being a subblock-based merge mode, the maximum number of merge candidates may be determined based on whether an affine mode is available for the current block.

Image encoding/decoding method and apparatus, and method of transmitting bitstream using sequence parameter set including information on maximum number of merge candidates

An image coding/decoding method and device are provided. The image decoding method carried out by the image decoding device, according to the present disclosure, may comprise the steps of: determining the number of tiles in a current picture on the basis that the segmentation of the current picture is not restricted; on the basis that the number of tiles in the current picture is a plurality, acquiring from a bitstream, a first flag representing whether tile boundary filtering is available; and, on the basis of the value of the first flag, determining whether to carry out filtering for the boundaries of the tiles belonging to the current picture.

Image coding/decoding method and device for selectively signaling filter availability information, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include obtaining a current block by splitting an image, determining a prediction mode of the current block, generating an intra prediction block of the current block, based on the prediction mode of the current block being an intra prediction mode, generating a residual block of the current block, and reconstructing the current block based on the prediction block and the residual block of the current block.

Image encoding/decoding method, apparatus and method for transmitting bitstream using maximum transform size setting of chroma block

The present invention relates to a method and an apparatus for interlayer prediction, and the method for interlayer prediction, according to the present invention, comprises the steps of: deciding whether to apply an interlayer prediction to an enhancement layer; and performing a prediction on a current block of the enhancement layer based on reference information that is generalized and generated from a reference picture, which is decoded, of a reference layer, when the interlayer prediction is applied, wherein the reference layer information can be encoding information of a reference block, which corresponds to a current block of the enhancement layer, from the reference layer, and residual information.

Method for coding and decoding scalable video and apparatus using same

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise obtaining palette information and palette index prediction information of a current block from a bitstream, based on a palette mode applying for the current block, constructing a palette predictor for the current block based on the palette information and constructing a palette table for the current block based on the palette predictor, generating a palette index map for the current block based on the palette index prediction information, and decoding the current block based on the palette table and the palette index map, The palette predictor may be selectively updated based on a split structure of the current block.

Image encoding/decoding method and device using palette mode, and method for transmitting bitstream

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise deriving a prediction sample of a current block based on motion information of the current block, determining whether bi-directional optical flow (BDOF) applies to the current block, based on that the BDOF applies to the current block, deriving a gradient for a current subblock in the current block, deriving motion refinement (v, v) for the current subblock based on the gradient, deriving a BDOF offset based on the gradient and the motion refinement, and deriving a refined prediction sample for the current block based on the prediction sample of the current block and the BDOF offset.

Image encoding/decoding method and device for performing BDOF, and method for transmitting bitstream

Growing community of inventors

Seoul, South Korea

Jung Hak Nam