Huawei Technologies Co., Limited

Qualcomm Incorporated

Google Inc.

Future Wei Technologies, Inc.

Jianle Chen

Marta Karczewicz

Xiang Yang Li

Semih Esenlik

Anand Meher Kotra

Ye-Kui Wang

Li Feng Zhang

Wei-Jung Chien

Haitao Yang

Han Gao

Biao Wang

Vadim Seregin

Yin Zhao

Krishnakanth Rapaka

Xin Zhao

Fnu Hendry

Zhijie Zhao

Alexey Konstantinovich Filippov

Vasily Alexeevich Rufitskiy

Huanbang Chen

Sergey Yurievich Ikonin

Hsiao-Chiang Chuang

Kai Zhang

Ying Hai Chen

Yi-Wen Chen

Roman Igorevich Chernyak

Joel Sole Rojals

Wei Pu

Timofey Mikhailovich Solovyev

Hongbin Liu

Rajan Laxman Joshi

Liwei Guo

Alexander Alexandrovich Karabutov

Xiang Ma

Yu-Chen Sun

Hongtao Wang

Vladyslav Zakharchenko

Amir Said

Woo-Shik Kim

Feng Zou

Sungwon Lee

Elena Alexandrovna Alshina

Jiali Fu

Lian Zhang

Xianglin Wang

Adarsh Krishnan Ramasubramonian

Yuqun Fan

Huameng Fang

Maxim Borisovitch Sychev

F N U Hendry

Ivan Krasnov

Xiang Li

Muhammed Zeyd Coban

Chao Pang

Victor Alexeevich Stepin

Chengjie Tu

Dmitry Yurievich Kuryshev

Han Huang

Cheng-Teh Hsieh

Done Bugdayci Sansli

Venkata Meher Satchit Anand Kotra

Kangying Cai

Auke Joris Wiggers

Dana Kianfar

Debargha Mukherjee

Dmytro Rusanovskyy

In Suk Chong

Dejun Zhang

Nan Hu

Shan Gao

Yan Zhang

Yung-Hsuan Chao

Jiafeng Zhu

Mohammed Golam Sarwer

Weiwei Xu

Ting Fu

Georgy Aleksandrovich Zhulikov

Birendra Kathariya

Wei Wang

Dejung Zhang

Jeffrey Moguillansky

Jie Shen

Rachel Barker

Wei Wei

Ying Chen

The present disclosure relates to the field of picture processing. Especially, the disclosure deals with improving the prediction of a block of a picture when decoding or encoding. A method of coding a block of a picture, comprising: obtaining an indication parameter for a current coding block. The indication parameter represents whether a multi-hypothesis prediction is applied to the current coding block. When the indication parameter represents that the multi-hypothesis prediction is applied to the current coding block, coding the current coding block according to a planar mode.

Encoder, decoder and corresponding methods of most probable mode list construction for blocks with multi-hypothesis prediction

A method for inverse quantization of a current block of a picture is provided. The method is performed by a decoder, and the picture comprises a luminance component and a chrominance component, where the luminance component and the chrominance component are partitioned into multiple blocks. The method includes obtaining one or more existing quantization parameter (QP) values from a received bitstream, wherein the one or more existing QP values are associated with a current block in the chrominance component; determining a QP value for the current block in the chrominance component based on the one or more existing QP values; performing inverse quantization on the current block in the chrominance component using the determined QP value.

Apparatus and method for inverse quantization

This application provides a motion vector obtaining method and apparatus. The method includes: determining a target offset vector of a block and identifier information of a target picture, wherein the block comprises at least one sub-block; determining a location of the sub-block; determining, as a target location coordinate value of a collocated sub-block, a location coordinate value obtained by performing a clipping operation on an initial location coordinate value in a range, wherein the initial location coordinate value is based on the location of the sub-block and the target offset vector; and obtaining a motion vector of the sub-block based on a motion vector corresponding to the target location coordinate value. Thus, a range of the target offset vector is limited, so that a quantity of memory read times can be reduced in a process of obtaining the motion vector of the collocated sub-block.

Motion vector obtaining method and apparatus

A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a flag and a picture including a sub-picture with a sub-picture boundary. The sub-picture is decoded. Filtering operations are performed across the sub-picture boundary when the flag is set to a first value. The filtering operations across the sub-picture boundary are omitted when the flag is set to a second value. The sub-picture is forwarded for display as part of a decoded video sequence.

Sub-picture level filtering in video coding

A method and image processing device are provided, including a deblocking filter. The deblocking filter modifies values of at most MA samples of the first image block as first filter output values, the at most MA samples being located at a column of the first image block that is perpendicular to and adjacent to the horizontal block edge; and modifies values of at most MB samples of the second image block as second filter output values, the at most MB samples being located at a column of the second image block that is perpendicular to and adjacent to the horizontal block edge. At most a number MA of sample values of the first image block adjacent to the block edge are modified and at most a number MB of sample values of the second image block adjacent to the block edge are modified, wherein MA<MB.

Apparatus and method for deblocking filter in video coding

The present disclosure provides an encoding apparatus and a decoding apparatus, as well as an encoding method and a decoding method. In particular, the present disclosure relates to block partitioning and signaling the partitioning parameters in a bitstream. An override flag in a slice header indicates whether or not a block is to be partitioned according to a first partition constraint information. The override flag is included in the bitstream and the block is partitioned accordingly.

Video encoder, a video decoder and corresponding methods with improved block partitioning

A method of decoding a coded video bitstream implemented by a video decoder is disclosed. The method includes determining that a coded video sequence (CVS) of the coded video bitstream includes a video coding layer (VCL) network abstraction layer (NAL) unit having a gradual decoding refresh (GDR) network abstraction layer (NAL) unit type (GDR_NUT), the VCL NAL unit having the GDR_NUT containing a GDR picture; initiating decoding of the CVS at the GDR picture; and generating an image according to the CVS as decoded. A corresponding method of encoding is also disclosed.

Gradual decoding refresh in video coding

The present disclosure relates generally to video coding and picture partitioning methods. In particular, the disclosure is concerned with relations between partition constraint elements, by setting partitioning rules for different picture partitioning methods. The disclosure provides devices and corresponding methods for generating or processing a bitstream including encoded pictures, particularly for setting and including partition constraint element into the bitstream. One of the devices is configured to determine a minimum luma size of a leaf block resulting from quadtree splitting (MinQtSizeY), determine a maximum luma size of a coding block where partitioning using a binary tree splitting is allowed (MaxBtSizeY) based on the MinQtSizeY, and include information for the determined MinQtSizeY into the bitstream.

Relation between partition constraint elements

A method of decoding is provided. The method includes receiving a video bitstream including a picture unit (PU), where the PU includes a picture header (PH) network abstraction layer (NAL) unit preceding a first video coding layer (VCL) NAL unit, and decoding a coded picture from the PU to obtain a decoded picture.

Signaling of picture header in video coding

A method of decoding is provided. The method includes receiving a video bitstream including a picture unit (PU), where a gradual decoding refresh (GDR) flag in a picture header (PH) of the PU has a first value to specify that a picture associated with the PH is a GDR picture; and decoding the GDR picture from the PU to obtain a decoded picture.

Embodiments provide methods and devices (encoder and/or decoder) of coding a picture. A History Based Motion Vector Prediction (HMVP) list for a current Coding Tree Unit (CTU) row within a tile of a picture is initialized and a CTU of the current CTU row is processed based on the initialized HMVP list.

Encoder, a decoder and corresponding methods using history based motion vector prediction

The present invention relates to method and apparatus for motion vector derivation for affine based inter prediction of chroma subblocks based on chroma format. The method includes: determining chroma scaling factors in horizontal and vertical directions based on chroma format information, wherein the chroma format information indicates a chroma format of a current picture which the current image block belongs to; determining a set (S) of luma subblocks of the luma block based on values of the chroma scaling factors; determining a motion vector for a chroma subblock of the chroma block based on motion vectors of one or more luma subblocks in the set (S) of luma subblocks.

Method and apparatus for affine based inter prediction of chroma subblocks

Devices and methods of directional intra prediction for chroma component of a picture are provided. The method includes obtaining an initial intra prediction mode of the chroma component based on a value of a luma intra prediction mode (intraPredModeY) by using a first look up table (LUT), deriving a chroma intra prediction mode (intraPredModeC) from a second LUT by using the initial intra prediction mode of the chroma component. The chroma component has different subsampling ratios in horizontal and vertical directions. The second LUT has 67 entries, indices for the second LUT are 0-66, and each index is associated with an angle of an intra prediction direction. The method further includes obtaining an angle parameter for the chroma component based on the chroma intra prediction mode intraPredModeC; and obtaining predicted samples of the chroma component based on the angle parameter.

Method and apparatus for chroma intra prediction in video coding

The present disclosure provides a coding method, wherein the coding includes decoding or encoding, and the method comprises determining whether a current coding unit is predicted by application of combined inter-intra prediction (CHIP); and in response to determining that the current coding unit is predicted by application of CIIP, setting a boundary strength of a boundary of the current coding unit to a first value.

Encoder, a decoder and corresponding methods of deblocking filter adaptation

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San Diego, CA, United States of America

Jianle Chen