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A Generalized Cylindrical Projection Method for 3D Point Clouds of Curved Skeletal Objects

A technology of 3D point cloud and cylindrical projection, which is applied to the details of 3D image data, instruments, graphics and image conversion, etc. It can solve the problem of projection distortion, difficulty in maintaining correctness of the relative orientation and distance of projected points, and the original point no longer has a reference value and other issues, to achieve the effect of correct geometric position relationship and uniform distribution

Active Publication Date: 2021-06-25
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

If the bending range is large or the length of the skeleton object is long, if you continue to use cylindrical projection, the relative orientation and distance between the projection points will be difficult to maintain correctness, resulting in projection distortion. Points will no longer have reference value

Method used

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  • A Generalized Cylindrical Projection Method for 3D Point Clouds of Curved Skeletal Objects
  • A Generalized Cylindrical Projection Method for 3D Point Clouds of Curved Skeletal Objects
  • A Generalized Cylindrical Projection Method for 3D Point Clouds of Curved Skeletal Objects

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Embodiment Construction

[0027] A generalized cylindrical projection method for curved skeletal objects comprising:

[0028] S1, identify the start section and end section from the 3D point cloud of the curved skeletal object, as figure 1 The point cloud of a section of expressway tunnel as shown is taken as an example, and the step S1 includes:

[0029] S1.1, cut point cloud slices with a certain thickness at the first and last ends of the point cloud. Generally, the thickness is 2 to 6 times the average point spacing, which is more reliable, such as figure 1 As shown in , ensure that the thickness of the point cloud slice is uniform and can form a complete cross-sectional profile. The point cloud slice does not require to be precisely perpendicular to the skeleton direction here;

[0030] S1.2, calculate the coordinates of the center point for the point cloud slices at the starting end and the ending end, and get as follows figure 1 Points A and B in . Assume that the start point cloud slice incl...

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Abstract

The invention discloses a generalized cylindrical projection method for a three-dimensional point cloud of a curved skeleton object. The three-dimensional point is projected into a two-dimensional coordinate system, and the starting section and the ending section of the point cloud to be projected are determined; A projected reference model consistent with the overall bending shape of the skeleton object, which is composed of a reference axis, a cylindrical coordinate system and a reference skeleton line; using the projected reference, the 3D point cloud coordinates are transformed from (x, y, z) form Euclidean coordinates are converted to two angle values ​​of the form (α,β). The present invention establishes a generalized cylindrical projection reference model suitable for long distances and large bending angles for curved skeleton objects, which can ensure the correctness of the positional relationship of projection points as a whole, and the projection reference can adapt to rotation around a self-defined central axis and at the same time Bending with deflection has wide adaptability to various curved skeleton objects.

Description

technical field [0001] The invention relates to a generalized cylinder projection method for a three-dimensional point cloud of a curved skeleton object, and belongs to the field of three-dimensional point cloud processing. Background technique [0002] The 3D laser scanning technology uses the ranging laser to scan the target surface in an automatic manner, and outputs a 3D point cloud at fixed intervals, which provides a new technical means for quickly and accurately measuring the overall geometric shape and local geometric details of the target. [0003] Although it can be collected very densely, the 3D point cloud is still only a discrete sampling of the target surface. To obtain a continuous surface model, the simplest and most direct method is to construct a triangulation model with the 3D point cloud as the vertex, which is a surface modeling method that maintains the accuracy of the original point cloud and preserves geometric details to the greatest extent. At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00
CPCG06T2200/04G06T3/067
Inventor 蓝秋萍李子宽李嘉邓辉
Owner HOHAI UNIV
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