Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Huawei Technologies Co., Limited

Honor Device Co., Ltd.

Snaptrack Incorporated

Vivo Mobile Communication Co., Ltd.

Fuzheng Yang

Shuai Wan

Junyan Huo

Yanzhuo Ma

Xinwei Li

Wei Zhang

Haixin Wang

Qihong Ran

Yu Sun

Lei Wei

Zexing Sun

Jinkun Guo

Zhecheng Wang

Jianglin Wang

Qingpeng Xie

Qiang Gao

Sixin Lin

Lina Sun

Dong Li

Shan Gao

Wei Xiao

Peiyun Di

Liang Zhou

Lianhuan Xiong

Haitao Yang

Wei Jun Zhang

Hui Yuan

Yuqun Fan

Sujun Zhang

Ze Guo

Lihui Yang

Xiaoyan Chai

Wenhan Qiao

Mingze Wang

Ruipeng Qiu

Chang Huang

Yilin Chang

Xiaobin Ding

Na Dai

Jiarun Song

Huameng Fang

Ke Zhang

Zhong Luo

Tian Chen

Liangliang Jiang

Zhuoyi Lv

Tengya Tian

Wenjie Zou

Xiaoxian Liu

Ziqiang Xu

Yuxin Du

Zhang Chen

Suhua Li

Xuemin Li

Youguang Yu

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

A method for coding includes: obtaining original point cloud data; creating an adaptive prediction list of the depth information of the point cloud; and predictively coding the depth information of the point cloud based on the adaptive prediction list, to obtain codestream information. According to the present invention, an adaptively updated prediction list of the depth information is created, and an optimal prediction mode is selected from the list to predict the depth information of the point cloud.

Method and apparatus for predictively coding and decoding depth information of point cloud

Disclosed are a point cloud encoding and decoding method and device based on a two-dimensional regularization plane projection. The encoding method includes: acquiring original point cloud data; performing two-dimensional regularization plane projection on the original point cloud data to obtain a two-dimensional projection plane structure; obtaining a plurality of pieces of two-dimensional image information according to the two-dimensional projection plane structure; and encoding the plurality of pieces of two-dimensional image information to obtain code stream information.

Point cloud encoding and decoding method and device based on two-dimensional regularization plane projection

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

This application discloses a point cloud encoding processing method and apparatus and a point cloud decoding processing method and apparatus. The point cloud encoding processing method of embodiments of this application includes: determining sparsity level information of a target point cloud; and in a case that the sparsity level information indicates the target point cloud being a sparse point cloud and a node to be encoded corresponding to the target point cloud satisfies an isolated point encoding condition, enabling an isolated point encoding mode.

Point cloud encoding processing method and apparatus and point cloud decoding processing method and apparatus

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

An encoding method includes: obtaining original point cloud data; transforming coordinates of the original point cloud data to obtain a coordinate transformation residual; establishing a relationship between azimuth information of a point cloud and the coordinate transformation residual; determining an encoding rule for the coordinate transformation residual based on the relationship between the azimuth information of the point cloud and the coordinate transformation residual; and encoding the coordinate transformation residual according to the encoding rule, to obtain data rate information.

Method and apparatus for encoding/decoding point cloud coordinate transformation residual

The present invention discloses a method and an apparatus for 2D regularized planar projection of a point cloud. The method includes: obtaining original point cloud data; initializing a planar structure of 2D projection of the point cloud; calculating horizontal azimuth information of the point cloud based on the original point cloud data; and determining a mapping relationship between the original point cloud data and the planar structure of 2D projection based on the horizontal azimuth information, to obtain a planar structure of 2D regularized projection of the point cloud. In the present invention, a large-scale point cloud may be projected to a 2D regularized planar structure without 2D local search. Therefore, complexity of an algorithm can be reduced, time spent on 2D regularized planar projection of the point cloud can be reduced, and algorithm performance can be improved.

Method and apparatus for 2D regularized planar projection of point cloud

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

A method for coding includes: obtaining original point cloud data; creating an adaptive prediction list of the attribute information of the point cloud; selecting a prediction mode from the adaptive prediction list and predicting the attribute information of the point cloud, to obtain a predicted residual; and coding the prediction mode and the predicted residual, to obtain codestream information.

Method and apparatus for predictively coding and decoding attribute information of point cloud

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

Growing community of inventors

Guangdong, China

Fuzheng Yang