Surface deformation information extraction method based on point cloud data

Abstract

The invention provides a surface deformation information extraction method based on point cloud data. In order to overcome the defects of an existing method for extracting deformation information based on point cloud data, deformation information between surfaces is extracted through curved surface matching operation, the characteristic of high spatial resolution of the point cloud is fully utilized, the extracted deformation information not only comprises three-dimensional displacement deformation, but also comprises torsional deformation of the surfaces, and a new thought and technical reference are provided for extracting the deformation information based on point cloud data.

Description

technical field [0001] The invention belongs to the field of deformation monitoring, in particular to a method for extracting surface deformation information based on point cloud data. Background technique [0002] The 3D laser scanning technology can quickly, efficiently and accurately obtain the 3D image data of the measurement target, and obtain the 3D coordinates of the solid surface points at millimeter sampling intervals. This technology breaks through the shortcomings of traditional single-point measurement and has been widely used in Deformation monitoring in areas such as building geometries, bridges, cultural heritage, landslides and dams. [0003] Using 3D laser scanning technology to obtain point cloud data of deformable objects, there are two main ways to extract deformation information based on point cloud data of deformable objects: 1) Select objects with obvious geometric features in the point cloud data of deformable objects (such as artificially laid marker...

AI Technical Summary

Problems solved by technology

[0004] The first method is similar to the traditional single-point deformation monitoring method, which ignores the overall deformation state and local deformation details of the deformable object, and does not make full use of the high spatial resolution characteristics of the 3D laser point cloud data.

The second method improves the accuracy of a single point cloud data by modeling the point cloud data, and can obtain deformation information with high spatial resolution. A general model for any deformable body, and the extracted deformation information is one-dimensional

[0005] A large number of engineering practices at home and abroad have shown that engineering accidents are often caused by local damage of a weak link, and under the action of random unfavorable factors, the rapid expansion leads to engineering accidents.

In practical applications, it is necessary to obtain the overall deformation information of the local area of ​​the deformable body, that is, it is necessary to extract the "surface" deformation information based on point cloud data. The above two methods of extracting deformation information based on point cloud data cannot be achieved.

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