Huawei Technologies Co., Limited

Future Wei Technologies, Inc.

Huawei Technoloiges Co., Ltd.

Huanbang Chen

Haitao Yang

Jianle Chen

Sixin Lin

Shan Gao

Fan Liang

Elena Alexandrovna Alshina

Lian Zhang

Xiang Ma

Yin Zhao

Sergey Yurievich Ikonin

Roman Igorevich Chernyak

Jiali Fu

Alexander Alexandrovich Karabutov

Timofey Mikhailovich Solovyev

Maxim Borisovitch Sychev

Alexey Konstantinovich Filippov

Vasily Alexeevich Rufitskiy

Hong Zhang

Shan Liu

Jiantong Zhou

Ting Fu

Xu Chen

Weiwei Xu

Han Gao

Jianhua Zheng

Sriram Sethuraman

Yuqun Fan

Jeeva Raj A

Sagar Kotecha

Jay Nitin Shingala

Fan Mu

Nan Song

A method for coding a video implemented in an encoder or a decoder including the enhanced interpolation filter, EIF, for motion compensation, the method comprising: i) determining control point motion vectors, CPMVs, for a block according to affine inter-prediction, the block being an affine block or a sub-block of the affine block; ii) for a predefined sub-block size determining a reference area for a sub-block with the predefined sub-block size according to values of the CPMVs; iii) comparing the determined reference area with a predefined threshold; iv) applying EIF for motion compensation, comprising deriving the pixel-based motion vector field for the block; wherein if the determined reference area is larger than the threshold, deriving the pixel-based motion vector field for the block further comprises motion vector clipping, wherein motion vector clipping range is determined based on motion model of the block and the size of the block.

Affine motion model restrictions for memory bandwidth reduction of enhanced interpolation filter

A video decoding method includes obtaining a to-be-entropy-decoded syntax element in a current block by parsing a received bitstream, where the to-be-entropy-decoded syntax element includes a syntax element 1 or a syntax element 2 in the current block, obtaining a context model corresponding to the to-be-entropy-decoded syntax element, where both of a context model corresponding to the syntax element 1 and a context model corresponding to the syntax element 2 are determined from the same preset context model set, entropy decoding the to-be-entropy-decoded syntax element based on the context model corresponding to the to-be-entropy-decoded syntax element, and obtaining a reconstructed image of the current block based on the syntax element obtained by entropy decoding.

Video decoding method and video decoder

The present invention relates to the field of video image processing, and provides a filtering method and an apparatus, to resolve a problem that subjective quality and objective quality of an image deteriorate because filtering processing cannot be performed on internal blocks of a non-translational motion prediction unit.

Filtering method for removing blocking artifact and apparatus

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

Image encoding and decoding methods, apparatuses and computer-readable media are described. An example decoding method include: determining a first decoded unit from two decoded units on a left side of a to-be-decoded unit and a second decoded unit from three decoded units above the to-be-decoded unit; calculating first and second motion vector predictors (MVPs) of M control points of the to-be-decoded unit based on motion vectors of control points of the first and the second decoded units, respectively; generating a first and a second motion vector group based on the first and the second MVPs of the M control points, respectively; determining a target motion vector group from motion vector groups comprising the first motion vector group and the second motion vector group; and predicting the to-be-decoded unit based on the target motion vector group.

Image decoding and encoding method and apparatus based on units of a same motion prediction mode obtained by two independent sequences

A video data inter prediction method is provided, which includes: determining a candidate motion information list of a current picture block, where the candidate motion information list includes at least one first candidate motion information group, at least one second candidate motion information group, the first candidate motion information group is a motion information group determined based on motion information of preset locations on a first neighboring picture block of the current picture block and a motion model of the first neighboring picture block, the second candidate motion information group is a set of motion information of at least two sample locations that are respectively neighboring to at least two preset locations on the current picture block; determining target motion information from the candidate motion information list; and performing inter prediction on the current picture block based on the target motion information.

Video data inter prediction based on control points

A picture prediction method and a related apparatus are disclosed. A picture prediction method includes: determining K1 pixel samples in a picture block x, and determining a candidate motion information unit set corresponding to each pixel sample in the K1 pixel samples, where the candidate motion information unit set corresponding to each pixel sample includes at least one candidate motion information unit; determining a merged motion information unit set i including K1 motion information units, where each motion information unit in the merged motion information unit set i is selected from at least a part of motion information units in candidate motion information unit sets corresponding to different pixel samples in the K1 pixel samples; and predicting a pixel value of the picture block x by using a non-translational motion model and the merged motion information unit set i.

Picture prediction method and related apparatus

An inter prediction method includes determining whether a non-rectangular inter prediction mode is allowed for a group of blocks; obtaining one or more inter prediction mode parameters and weighted prediction parameters for the group of blocks; and obtaining prediction value of a current block based on the one or more inter prediction mode parameters and weighted prediction parameters, wherein one of the inter prediction mode parameters indicates reference picture information for the current block, and wherein the group of blocks comprises the current block.

Method and apparatus of harmonizing weighted prediction with non-rectangular merge modes

Embodiments of this application discloses bi-directional inter prediction methods and apparatuses. One method includes: determining a reference picture index iof a first reference picture list as a first reference picture index corresponding to a current block, determining a reference picture index iof a second reference picture list as a second reference picture index corresponding to the current block, and predicting the current block based on the first reference picture index and the second reference picture index, wherein the current picture comprises the current block.

Bi-directional inter prediction method and apparatus

The present disclosure relates to video encoding and decoding, and in particular, a method for inter prediction for a block in a frame of a video signal includes: constructing a history-based motion information candidate list, wherein the list is an ordered list comprising N history-based motion information candidates Hcontaining motion information of N preceding blocks preceding the block, wherein each history-based motion information candidate comprises: one or more motion vectors (MVs), one or more reference picture indices corresponding to the MVs, and an interpolation filter index; adding one or more history-based motion information candidates from the history-based motion information candidate list into a motion information candidate list for the block; and deriving motion information for the block based on the motion information candidate list.

Method and apparatus for deriving an interpolation filter index for a current block

This application provides a video picture prediction method and apparatus, to resolve a problem in a conventional technology that a length of a coded video sequence is increased. The first type of identifier may be added to a bitstream. The first type of identifier is used to indicate whether an affine motion model-based inter prediction mode is enabled for a video picture. For a video picture or a picture block included in the slice for which the affine motion model does not need to be used, a parameter, related to the affine motion model, of the picture block may not need to be transmitted. On a decoder side, during decoding of the picture block, the parameter related to the affine motion model does not need to be parsed. This can reduce load of a decoder, increase a processing speed, and decrease a processing time.

Video picture prediction method and apparatus

An intra prediction method includes obtaining respective intra prediction modes or texture distributions of P reconstructed picture blocks in a surrounding region of a current block; obtaining, based on the respective intra prediction modes or texture distributions of the P reconstructed picture blocks, Q priori candidate intra prediction modes of the current block and Q probability values; obtaining, based on M probability values corresponding to M priori candidate intra prediction modes, M weighting factors corresponding to the M priori candidate intra prediction modes; separately performing intra prediction based on the M priori candidate intra prediction modes to obtain M predicted values; and obtaining a predicted value of the current block based on a weighted summation of the M predicted values and the corresponding M weighting factors.

Intra prediction method and apparatus

The present disclosure relates to moving picture processing, and in particular, to cases where non-rectangular partitioning modes are used for inter-prediction in a combination with weighted prediction (WP) for coding fades. Non-rectangular modes refer to those inter-prediction modes, in which case a current block is partitioned/sliced in a non-rectangular way (slices). Such modes may be triangular (TMP) or geometric (GEO) prediction. The aim of the disclosure is to harmonize non-rectangular partitioning modes with WP by way of disabling TMP/GEO when WP is applied. This may be accomplished by checking whether all reference pictures for a current slice are disabled, and if this is the case to disable the slice-level WP for non-rectangular prediction units. Whether the reference pictures are disabled may be determined based on conditions applied on set values, for example, of luma/chroma flags, which refer to the reference pictures.

Method and apparatus of harmonizing triangular merge mode with weighted prediction

The present disclosure relates to an apparatus, an encoder, a decoder and corresponding methods for prediction refinement with optical flow (PROF) for an affine coded block, in which when a plurality of optical flow decision conditions are fulfilled for the affine coded block, performing a PROF process for a current sub-block of the affine coded block to obtain refined prediction sample values of the current sub-block of the affine coded block. After the sub-block based affine motion compensation is performed, a prediction sample value of the current sample of the current sub-block is refined by adding a delta prediction value. Thus, it allows for a better trade-off between coding complexity and prediction accuracy.

Method and apparatus for prediction refinement with optical flow for an affine coded block

A video picture prediction method and apparatus are provided, to provide a manner of determining a maximum length of a candidate motion vector list corresponding to a subblock merge mode. The method includes: parsing a first indicator from a bitstream; if the first indicator indicates that a candidate mode used to inter predict the to-be-processed block includes an affine mode, parsing a second indicator from the bitstream, where the second indicator is used to indicate a maximum length of a first candidate motion vector list, and the first candidate motion vector list is constructed for the to-be-processed block, a subblock merge prediction mode is used for the to-be-processed block; and determining the maximum length of the first candidate motion vector list based on the second indicator.

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Shenzhen, China

Huanbang Chen