Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Huawei Technologies Co., Limited

Snaptrack Incorporated

Shuai Wan

Junyan Huo

Fuzheng Yang

Yanzhuo Ma

Xinwei Li

Wei Zhang

Haixin Wang

Qihong Ran

Yu Sun

Lei Wei

Zhecheng Wang

Zexing Sun

Jinkun Guo

Ze Guo

Jianglin Wang

Sujun Zhang

Lihui Yang

Mingze Wang

Qingpeng Xie

Qiang Gao

Wenhan Qiao

Ruipeng Qiu

Sixin Lin

Lianhuan Xiong

Xiaobin Ding

Na Dai

Zhang Chen

Wei Jun Zhang

Zhong Luo

Xiaoyan Chai

Yilin Chang

Provided are a method for predicting a colour component, an encoder and a decoder. The method includes: a first reference sample set of a colour component to be predicted of a current block is determined; a reference sample subset is determined from the first reference sample set, where the reference sample subset includes one or more candidate samples selected from the first reference sample set; and a model parameter of a prediction model is calculated according to positions of reference samples in the reference sample subset, where the prediction model is configured to perform prediction processing on the colour component to be predicted of the current block.

Image component prediction method, encoder, decoder, and storage medium

A method for intra prediction includes: obtaining multiple previously reconstructed neighbouring blocks corresponding to a current processing block; determining prediction modes, that are signalled in a bitstream, corresponding to neighbouring blocks of the multiple previously reconstructed neighbouring blocks, to obtain multiple first prediction modes; if the multiple first prediction modes comprise at least two directional modes, taking directional modes comprised in the multiple first prediction modes as first prediction directions; performing, according to a preset operation rule, operation on multiple first prediction directions of the first prediction directions to obtain second prediction directions; obtaining a prediction mode set according to the second prediction directions and the multiple first prediction modes; and performing intra prediction on the current processing block based on the prediction mode set.

Methods for intra prediction, encoder and decoder

A point cloud decoding method includes that: a decoder decodes a bitstream, and determines a mode parameter; in response to the mode parameter indicating to use a spatial scalability mode, the decoder determines geometric center coordinates of a current node, and determines, in the point cloud, geometric center coordinates of neighbouring nodes of the current node based on the geometric center coordinates of the current mode; the decoder determines local spatial coordinate means corresponding to the current node based on the geometric center coordinates of the current node and the geometric center coordinates of the neighbouring nodes; and the decoder determines reconstructed geometric information of the current node based on the local spatial coordinate means. Further, a decoder and a non-transitory computer-readable storage medium are also provided.

Point cloud decoding method, decoder, and non-transitory computer-readable storage medium

Embodiments of the present application provide an inter prediction method, an encoder, a decoder, and a storage medium. The method comprises: determining a prediction mode parameter of a current block; when the prediction mode parameter indicates that the current block determines an inter prediction value by using a geometrical partition mode (GPM), constructing a merge candidate list of the current block; constructing a GPM motion information candidate list according to first motion information in the merge candidate list of the current block; and determining an inter prediction value of the current block according to the GPM motion information candidate list.

Inter prediction method, encoder, decoder, and storage medium

Provided are a method for determining a prediction direction, a decoder and a computer storage medium. The method is implemented by a decoder. The method includes that: a Direct Mode (DM) in a chroma intra prediction mode of a block to be decoded is acquired (S); and an index number of a prediction direction in a DM derived mode is determined based on an offset N and an index number M of a prediction direction in the DM to determine the DM derived mode (S).

Method for determining prediction direction, decoder, and computer storage medium

A geometry reconstruction method performed by a decoder includes that a neighbouring node of a current node is determined based on location information of the current node; a factor of impact of the neighbouring node in direction along a preset axis on the current node is determined based on attribute information of the neighbouring node; a weight of the neighbouring node of the current node is determined; and coordinates of the current node after geometry reconstruction are determined based on the weight of the neighbouring node and the factor of impact of the neighbouring node in direction along the preset axis on the current node.

Geometry reconstruction method, decoder and computer storage medium

A method for intra prediction includes: determining occupancy information of a first number of neighboring nodes of a coded node; determining occupancy information of a second number of neighboring nodes of the coded node based on a position association between at least one neighboring node of the coded node and a child node of the coded node, where the first number is greater than the second number; determining an occupancy number corresponding to the second number of neighboring nodes based on the occupancy information of the second number of neighboring nodes; and determining an occupancy prediction result of the child node of the coded node based on the occupancy number. A decoder and a method for intra prediction performed by the decoder are also provided.

Methods for intra prediction, and encoder

Provided are a method for constructing a Morton code, an encoder, decoder and computer storage medium. The encoder determines geometric information of a current point in a point cloud; determines an index value corresponding to a coordinate component according to the coordinate component in the geometric information; determines a Morton code component corresponding to the coordinate component according to the index value and a Morton code lookup table; determines a Morton code of the current point according to the Morton code component. The encoder analyzes a bitstream to determine geometric information of a current point in a point cloud; determines an index value corresponding to a coordinate component according to the coordinate component in geometric information; determines a Morton code component corresponding to the coordinate component according to the index value and a Morton code lookup table; determines a Morton code of the current point according to Morton code component.

Method for constructing morton codes, encoder, decoder, and storage medium

A method for picture prediction, an encoder, and a decoder are provided. The method includes the following. An initial predicted value of a colour component to-be-predicted of a current block in a picture is obtained through a prediction model. The initial predicted value is filtered and a target predicted value of the colour component to-be-predicted of the current block is obtained.

Method for picture prediction, encoder, and decoder

A method for intra prediction and a decoder are provided. The method includes the following operations. At least one neighbouring block of a current block is determined. A first intra prediction mode index of the at least one neighbouring block is determined. An intra prediction mode list is constructed based on the first intra prediction mode index of the at least one neighbouring block. A first intra prediction mode index of the current block is determined based on the intra prediction mode list. A width to height ratio of the current block is obtained, and the first intra prediction mode index is mapped to a second intra prediction mode index according to the width to height ratio. Prediction is performed for the current block based on a target intra prediction mode, and a prediction block is obtained.

Intra prediction method and device and computer-readable storage medium

A method and device for intra prediction are provided. The method includes: when determining that a current level obtained by partitioning an input point cloud is lower than a target level, obtaining occupation information of a first number of neighbouring nodes of a current node; extracting occupation information of a second number of neighbouring nodes from the occupation information of the first number of neighbouring nodes, the first number being greater than the second number, and the second number of neighbouring nodes being in an association relationship with a child node of the current node, and performing intra prediction on occupation information of the child node of the current node based on the occupation information of the second number of neighbouring nodes to obtain a first prediction result.

Method and device for intra prediction

Disclosed are a point cloud encoding and decoding method, and a decoder. The method includes: acquiring geometric information and attribute information of an input point cloud; determining a maximum allowable value of a sampling period when the input point cloud is subjected to level-of-detail (LOD) division; determining a preset value of the sampling period on the basis of the maximum allowable value of the sampling period; processing the input point cloud according to the preset value of the sampling period and the geometric information, so as to obtain at least one refinement layer and at least one detail layer; and encoding the attribute information by using the at least one refinement layer and the at least one detail layer, so as to generate a code stream, and writing the preset value of the sampling period into the code stream.

Point cloud encoding and decoding method, and decoder

A transform method includes: determining a prediction mode parameter of a current block; determining a MIP parameter when the prediction mode parameter indicates that MIP is used for the current block to determine an intra prediction value; determining the intra prediction value of the current block according to the MIP parameter, and calculating a residual value between the current block and the intra prediction value; performing a first transform on the residual value to obtain a first coefficient matrix; determining a scanning order of LFNST coefficients used for the current block according to the MIP parameter when an LFNST is used for the current block; constructing an input coefficient matrix of the LFNST based on the first coefficient matrix according to the scanning order of LFNST coefficients; and performing an LFNST processing on the input coefficient matrix to obtain a transform coefficient matrix of the current block.

Transform method, encoder, decoder, and storage medium

A method for decoding a picture, a method for encoding a picture, an encoder, and a decoder are provided. The method for encoding a picture includes (i) determining a width and a height of a coding block in the picture; (ii) if the width and the height are equal to N, where N is a positive integer power of 2, determining a matrix-based intra prediction (MIP) size identifier indicating that an MIP prediction size equal to N; (iii) deriving a group of reference samples of the coding block; and (iv) deriving an MIP prediction of the coding block based on the group of reference samples and an MIP matrix corresponding to the MIP size identifier.

Growing community of inventors

Guangdong, China

Shuai Wan