Method of three-dimensional reconstruction for pipeline structures

Abstract

The invention provides a method of three-dimensional reconstruction for pipeline structures and belongs to the field of three-dimensional point-cloud modeling. The method includes: acquiring point-cloud data of a pipeline and a unit normal vector of ground; transforming the point-cloud data into a coordinate system with a Z axis, namely the ground normal vector; calculating a normal vector of the point-cloud data after coordinate transformation; separating to obtain the point-cloud data with the normal vector parallel to the ground and projecting the data to a plane parallel to the ground; separating to obtain the point-cloud data with the normal vector not parallel to the ground, projecting the data to a Gaussian sphere, projecting the data to the equator latitudinally, and detecting peak points on the equator; projecting the point-cloud data in the area in which the peak pints are located to a plane consisting of a peak direction and the Z axis; forming a point-cloud circle by the obtained point-cloud data; and forming a three-dimensional diagram of the pipeline by the point-cloud circle. Noise interference is avoided maximally. The point-cloud data can be classified vividly even when the point-cloud data are obtained incompletely. Calculated amount is small. The method is applicable to three-dimensional reconstruction of various pipelines.

Description

technical field [0001] The invention relates to the field of three-dimensional point cloud modeling, in particular to a method for three-dimensional reconstruction of pipeline structures. Background technique [0002] Pipeline factories widely exist in industries such as petroleum, chemical industry and metallurgy, involving a large number of criss-crossing and very dense pipelines. In a relatively complete, systematic and idealized pipeline factory collaborative design and management system, the 3D geometric model of the pipeline factory occupies a key position. It is the carrier of various engineering data. The 3D modeling technology of the pipeline factory has become the Key issues in designing and managing systems. [0003] Many pipeline factories were constructed earlier, and their two-dimensional drawings have become incomplete after several reconstructions and expansions. Since there is no corresponding three-dimensional geometric model, it is impossible to use moder...

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Problems solved by technology

[0003] Many pipeline factories were constructed earlier, and their two-dimensional drawings have become incomplete after several reconstructions and expansions. Since there is no corresponding three-dimensional geometric model, it is impossible to use modern management methods for pipeline factories to manage them

At present, the point cloud data of the pipeline factory can be obtained by laser scanning, but due to the large scale and complex structure of the factory, the obtained point cloud data is usually incomplete and contains a lot of noise, which makes it very difficult to restore the 3D geometric model from the point cloud data

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