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Point cloud geometrical information inter-frame encoding and decoding method

A technology of geometric information and inter-frame coding, which is applied in the field of codec, can solve the problems that the correlation in the time domain cannot remove redundant information, and there is no inter-frame technology.

Active Publication Date: 2021-03-26
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current AVS point cloud coding platform, there is no inter-frame technology, only the above-mentioned intra-frame technology, so only spatial correlation can be used to remove redundant information, and temporal correlation cannot be used to remove redundant information.

Method used

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  • Point cloud geometrical information inter-frame encoding and decoding method
  • Point cloud geometrical information inter-frame encoding and decoding method
  • Point cloud geometrical information inter-frame encoding and decoding method

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Embodiment 1

[0064] refer to image 3 , in the AVS encoding process, the inter-frame technology, so that an inter-frame encoding method with point cloud geometric information provided by the embodiment of the present invention can inter-frame predict the point cloud of the current frame before performing entropy encoding, and then perform entropy encoding.

[0065] like Figure 4 As shown, a method for inter-frame coding of point cloud geometric information provided by an embodiment of the present invention includes:

[0066] S1a, obtaining the frame point cloud before the current frame point cloud as the reference frame point cloud of the current frame point cloud;

[0067] Wherein, the point cloud of the frame before the point cloud of the current frame may be the point cloud of the previous frame of the point cloud of the current frame, or a frame of the point cloud of the previous N frames, and the present invention does not limit it here.

[0068] S2a, performing voxelization proces...

Embodiment 2

[0086] As an optional embodiment of the present invention, for each node to be coded in the first octree structure, when the occupancy of the reference node corresponding to the node to be coded is occupied, the acquisition and reference node The steps of the occupancy situation of the adjacent first neighbor node include:

[0087] For each node to be encoded in the first octree structure, when the occupancy of the reference node corresponding to the node to be encoded is occupied, the occupancy of the first neighbor node coplanar with the reference node is acquired.

Embodiment 3

[0089] As an optional embodiment of the present invention, for each node to be encoded in the first octree structure, when the occupancy of the reference node corresponding to the node to be encoded is occupied, the acquisition and reference Before the step of the first neighbor node adjacent to the node, the point cloud geometric information interframe coding method also includes:

[0090] Step a: For each node to be encoded in the first octree structure, determine whether the reference node corresponding to the node to be encoded is occupied, if not, then obtain the coplanar, collinear, copoint and The occupancy of any or combined second neighbor nodes in the co-plane of the parent node of the coding node;

[0091] Step b: Determine the context model of the occupancy code of the node to be encoded based on the occupancy situation of the second neighbor node.

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Abstract

The embodiment of the invention provides a point cloud geometrical information inter-frame encoding and decoding method. The method comprises the following steps: acquiring a frame point cloud in front of a current frame point cloud as a reference frame point cloud; making octree division on the current frame point cloud and the reference frame point cloud respectively, then dividing divided nodes, making iterative division until leaf nodes are ended to acquire a first octree structure of the current frame point cloud and a second octree structure of the reference frame point cloud; obtainingthe occupation condition of each reference node, and when the occupation condition of the reference node corresponding to the coding node is occupied, obtaining the occupation condition of a first neighbor node of the reference node; and determining a context model of a to-be-coded node placeholder code based on the placeholder condition, and performing entropy coding according to the context model to obtain a binary code stream. When the inter-frame prediction is occupied, the inter-frame context model is used for entropy coding, otherwise, the intra-frame context model is used for entropy coding, and motion compensation is not needed, so that the inter-frame coding and decoding complexity can be reduced, and the geometric entropy coding performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of encoding and decoding, and in particular relates to an inter-frame encoding and decoding method of point cloud geometric information. Background technique [0002] With the continuous development of point cloud technology, the compression coding of point cloud data has become an important research issue. At present, the domestic digital audio and video codec technology standard working group (AVS, Audio Video coding Standard Workgroup of China) and the moving picture experts group (MPEG, Moving Picture Experts Group) in the International Organization for Standardization are both formulating standards for point cloud coding. At this stage, the point cloud encoding process of AVS is as follows: figure 1 As shown in Fig. 1, coordinate transformation is first performed on the geometric information, so that all point clouds are contained in a bounding box (bounding box). Then quantize. This step of quantizat...

Claims

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Application Information

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IPC IPC(8): H04N19/159H04N19/13H04N19/91H04N19/96
CPCH04N19/159H04N19/96H04N19/91H04N19/13
Inventor 张伟杨付正聂佳明陈天
Owner XIDIAN UNIV
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