Measurement method and system of non-contact tube-class object

Abstract

The invention relates to a measurement method and system of a non-contact tube-class object. The measurement method comprises the following steps of: step 1, tube-class object image acquisition; step 2, tube-class object three-dimensional model reconstruction; and step 3, tube-class object center line extraction: encapsulation, triangular patch processing and materialization are performed on the three-dimensional point cloud data of a tube-class object obtained in the second step, so that a three-dimensional solid model of the tube-class object can be obtained, and center line data are extracted from the three-dimensional solid model, or piecewise cutting is performed on the three-dimensional point cloud data obtained in the second step, circle fitting is performed on points on the cross sections of the three-dimensional point cloud data, so that the center of each cross section circle is obtained, and the centers of the cross section circles are a series of discrete points on the center line of the tube-class object, curve-fitting is performed through using the least square method and based on the discrete points, so that the center line data can be extracted.

Description

Technical field [0001] The invention relates to a method and system for measuring non-contact tube objects. Background technique [0002] As an important component widely used in various industrial fields, elbows have important uses in the fields of vehicles, petroleum, chemical, navigation, aviation, and nuclear industries. The quality of the pipe may directly affect whether the entire machine or equipment can be normal. Safe operation. Therefore, in the actual production of elbows, how to efficiently and accurately measure whether the various parameters of the produced elbows meet the design requirements is of great significance. [0003] The bending of pipe bending is a complex process integrating material nonlinearity, geometric nonlinearity and boundary condition nonlinearity. The influencing factors of this process are complex and the forming quality is difficult to control. At present, in the development and production of complex military products such as aviation and aero...

AI Technical Summary

Problems solved by technology

However, this method has the following problems: this method can only obtain the data of the curved pipe image and the center line of the image, but cannot obtain the actual situation of the curved pipe; Centerline, therefore, takes longer

Especially when there is deformation on the surface of the pipe object, the extraction error of the two-dimensional centerline is relatively large, and it needs to extract the two-dimensional centerline first and then fit the three-dimensional centerline, the calculation is complicated and the error is large

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