Generalized cylinder projection method aiming at bending matrix type object three dimensional point cloud

Abstract

The invention discloses a generalized cylinder projection method aiming at a bending matrix type object three dimensional point cloud; the method comprises the following steps: projecting three dimensional points into a two dimension coordinate system, and determining a start section and a stop section of a projected point cloud; building a projection reference model consistent with the matrix object total bending shape according to the two sections, wherein the model comprises a reference axis, a cylinder coordinate system and a reference matrix line; using the projection reference model to convert the three dimensional point cloud coordinates from the Euclidean coordinates (x, y, z) into two angle values of [alpha] [beta] mode. The method builds the generalized cylinder projection reference model for the bending matrix object, and the model is suitable for long distance and large bending angle, thus totally ensuring the projection point position relation correctness; the projection reference model can suit rotations around a self-defined center pin and curves having flexibility, thus providing wide adaptability for various types of bending matrix objects.

Description

Technical field [0001] The invention relates to a generalized cylindrical 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 fixed interval 3D point cloud, which provides a new technical means for quickly and accurately measuring the overall geometric form and local geometric details of the target. [0003] Although it can be collected very densely, the 3D point cloud is still only a discrete sample of the target surface. To obtain a continuous surface model, the simplest and direct method is to build a triangulation model with a three-dimensional point cloud as the vertex. This is a surface modeling method that maintains the accuracy of the original point cloud to the maximum and retains geometric details. At present, the two-dimen...

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

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