Surface grid reconstruction method and system based on point cloud data and related equipment

A technology of point cloud data and surface mesh, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as inability to realize 3D surface reconstruction, lack of features of measured objects, etc., and achieve the effect of improving accuracy and wide application

Active Publication Date: 2019-04-23
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

However, in the existing technology, slices of fixed thickness are used to fit point cloud data or simply fit each slice to obtain the contour surface, which may miss some features of the measured object, and cannot achieve accurate 3D surface reconstruction

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  • Surface grid reconstruction method and system based on point cloud data and related equipment
  • Surface grid reconstruction method and system based on point cloud data and related equipment
  • Surface grid reconstruction method and system based on point cloud data and related equipment

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Embodiment Construction

[0067] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0068] In order to solve the shortcomings of the equal-spaced slicing method in the traditional method, the present invention uses the density information of the three-dimensional point cloud in the vertical direction to provide an uneven-spaced segmentation strategy, and at the same time uses the alpha-shape algorithm and the cubic Bay The Searle curve fitting gives a more accurate cross-sectional profile, which makes the reconstruction effect more ideal.

[0069] figure 1 is a schematic diagram of the main steps of the embodiment of the surface mesh reconstruction method based on point cloud data of the present invention. like figure 1 As ...

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Abstract

The invention relates to the technical field of three-dimensional surface reconstruction, in particular to a surface grid reconstruction method and system based on point cloud data and the related equipment, which aim to improve the reconstruction precision. The reconstruction method comprises the steps of projecting coordinate information of point cloud data to a z-axis, calculating a z-coordinate probability density function, and further calculating a curvature local extreme point of the z-coordinate probability density function; for each local extreme point, drawing a plane which passes through the point and is perpendicular to the z axis as a cross section; performing segmentation between the local extreme points according to a preset segmentation layer number to obtain a plurality ofcross sections perpendicular to the z axis; projecting points in the upper and lower specific distance ranges of each cross section onto the cross section, and further calculating boundary points of the cross section; fitting a boundary curve corresponding to the cross section according to the calculated boundary points, and performing resampling; and connecting all the resampling boundary pointson the adjacent cross sections to obtain a reconstructed surface grid. According to the invention, the surface reconstruction precision of the point cloud data is improved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional surface reconstruction, in particular to a surface mesh reconstruction method, system and related equipment based on point cloud data. Background technique [0002] Using the surface mesh reconstruction method, the physical model can be quickly and accurately reconstructed, so it is widely used in many fields such as clinical medicine, digital entertainment, industry, and agriculture. [0003] The 3D discrete point cloud surface reconstruction algorithm based on the slice method can quickly obtain the contour data of the 2D section from the point cloud data, thereby completing the 3D surface reconstruction. Compared with the traditional method, it has the advantages of fast speed and good reconstruction effect. However, in the prior art, slices with a fixed thickness are used to fit the point cloud data or each slice is simply fitted to obtain the contour surface, which may miss some fea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06T7/11
CPCG06T7/11G06T17/20G06T2207/10028Y02A90/10
Inventor 李红军慕生鹏李世林
Owner BEIJING FORESTRY UNIVERSITY
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