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Three-dimensional laser scanning data modeling method and system

A scanning data and three-dimensional laser technology, applied in the field of laser scanning, can solve problems such as poor timeliness, difficult post-processing of scanned data, interpolation, etc.

Active Publication Date: 2015-07-08
CENT SOUTH UNIV +1
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AI Technical Summary

Problems solved by technology

[0002] The 3D laser scanner is a new type of 3D coordinate measuring instrument that integrates a variety of high-tech. It uses a non-contact high-speed laser measurement method to obtain the 3D data of the array geometry on the surface of the measured object in the form of a point cloud. The basic principle of distance has been developed and mature, and the accuracy and effectiveness of data acquisition can be guaranteed. However, the scanning result is only the point cloud data of the surface of the entity to be measured, and a more practical three-dimensional entity surface model is needed in the application. Therefore, Post-processing of scanned data has been difficult
The zero-set method first proposed by Hoppe et al. is based on the implicit surface method. This type of method cannot interpolate points in the point cloud and its application is limited; the Ball-Pivoting method proposed by Bernardini et al. and the greedy algorithm proposed by Cochen Steiner belong to the region growth method, the quality of the mesh constructed by this type of method depends too much on the selection of seed patches and the setting of custom parameters. In the case of uneven sampling, subsequent hole filling is required; the representative algorithm based on Delaunay triangulation is Guo The α-shape method proposed by Dey et al., the Cocone algorithm proposed by Dey et al., the Crust algorithm and the Power Crust algorithm proposed by Amenta et al., etc., due to the use of intermediate data structures, this type of algorithm has a large amount of calculation and poor timeliness
[0004] In view of the above phenomena, a fast and accurate modeling method is urgently needed to solve the modeling problem of 3D laser scanning data

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Embodiment 1

[0068] figure 1 A flow chart of a three-dimensional laser scanning data modeling method based on joint projection of a hemispherical surface and a plane provided by Embodiment 1 of the present invention is shown. see figure 1 The 3D laser scanning data modeling method based on the joint projection of hemispherical surface and plane provided by Embodiment 1 of the present invention includes:

[0069] Step 101: According to the coordinates PO of the scanning head (po x , po y , po z ), the initial orientation of the scanning head (θ, α) and the polar coordinates Po of N three-dimensional laser scanning data points i (θ i , α i , d i ), to obtain the longest distance d from the scanning data point to the scanning head max .

[0070] In this step, according to the coordinates PO(po x , po y , po z ) and the initial orientation (θ, α) of the scanning head to establish a laser scanner coordinate system (where θ is the initial inclination angle of the scanning head, and α...

Embodiment 2

[0118] Figure 8 A schematic structural diagram of a three-dimensional laser scanning data modeling system based on joint projection of a hemispherical surface and a plane provided by Embodiment 2 of the present invention is shown. see Figure 8 The 3D laser scanning data modeling system based on the joint projection of the hemispherical surface and the plane provided by Embodiment 2 of the present invention includes: a preprocessing unit 81, a hemispherical surface projection unit 82, a plane projection unit 83, an arbitrary axis rotation unit 84, and a plane triangulation unit. Topological relationship acquisition unit 85 and three-dimensional laser data modeling unit 86;

[0119] Wherein, the preprocessing unit 81 is used for scanning head coordinates PO(po x , po y , po z ), the initial orientation of the scanning head (θ, α) and the polar coordinates Po of N three-dimensional laser scanning data points i (θ i , α i , d i ), to obtain the longest distance d from th...

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Abstract

The invention discloses a three-dimensional laser scanning data modeling method and system based on semi-spherical surface and plane united projection. The three-dimensional laser scanning data modeling method includes that projecting N three-dimensional laser scanning data points to a semi-spherical surface to obtain semi-spherical surface mapping points; projecting the N semi-spherical surface mapping points to a plane to obtain N three-dimensional laser scanning data plane mapping points; converting the plane mapping points into N rectangular coordinates, and performing random axis coordinate rotation to obtain the plane mapping points of coordinate systems on a horizontal surface; triangulating the plane mapping points on the horizontal surface to obtain irregular triangular network topology relationships between plane mapping points; correspondingly assigning the irregular triangular network topology relationships between plane mapping points to three-dimensional laser scanning data points to obtain the irregular triangular network topology relationships between three-dimensional laser scanning data points to finish the modeling for the three-dimensional laser scanning data points. The three-dimensional laser scanning data modeling method and system are capable of realizing the quick and precise modeling for the three-dimensional laser scanning data.

Description

technical field [0001] The invention relates to the field of laser scanning, in particular to a three-dimensional laser scanning data modeling method and system based on combined projection of a hemispherical surface and a plane. Background technique [0002] The 3D laser scanner is a new type of 3D coordinate measuring instrument that integrates a variety of high-tech. It uses a non-contact high-speed laser measurement method to obtain the 3D data of the array geometry on the surface of the measured object in the form of a point cloud. The basic principle of distance has been developed and mature, and the accuracy and effectiveness of data acquisition can be guaranteed. However, the scanning result is only the point cloud data of the surface of the entity to be measured, and a more practical three-dimensional entity surface model is needed in the application. Therefore, Post-processing of scanned data has always been difficult. [0003] Methods to solve point cloud data mo...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
Inventor 王李管陈鑫贾明滔张建国彭平安
Owner CENT SOUTH UNIV
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