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Automatic disordered point set matching method for industrial measurement design comparative analysis

A technology of comparative analysis and industrial measurement, applied in the field of matching, to achieve the effect of reducing the initial matching error, good integrity, and improving work efficiency

Inactive Publication Date: 2013-09-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the design comparison and matching of spatially discrete point sets, at present, the method of manually specifying common points for conversion is mostly used, and at least 3 pairs of common points are specified, and the research on automatic matching is rarely seen.

Method used

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  • Automatic disordered point set matching method for industrial measurement design comparative analysis
  • Automatic disordered point set matching method for industrial measurement design comparative analysis
  • Automatic disordered point set matching method for industrial measurement design comparative analysis

Examples

Experimental program
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Embodiment

[0054] Such as figure 1 As shown, the existing design point set Degn(PD1 , P D2 ,...,P Dm ), and the measurement point set Surv(P S1 , P S2 ,...,P Sn ), m is not necessarily equal to n, and the two point sets are out of order, and the common point set of the two point sets is recorded as P=Degn∩Surv.

[0055] The side length matching strategy is:

[0056] Based on the design point set, the matching is performed by selecting the edges in the measurement point set, and the edges participating in the matching between the design point set and the measurement point set are L AB and L XY , where A and B are L AB The two ends of , X, Y are L XY The two ends of , and record the matching ambiguity ΔE as 3σ, where σ is the modulus sum of the error in measurement and the error in construction or welding, and the value is taken according to experience and calibration of measuring instruments;

[0057] If the length of both sides satisfies the formula

[0058] L XY -2ΔE≤L AB ≤ ...

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Abstract

The invention relates to an automatic disordered point set matching method for industrial measurement design comparative analysis. The method comprises the following steps of: 401) receiving design point set data from a design point set database and measurement point set data from a measurement point set database respectively by using a server; 402) calculating the relative distance between points in the two point sets by using the server to obtain two point set relative distance orders; 403) performing descending order on the two point set relative distance orders respectively by using the server according to a quick ordering method; 404) performing side length matching by using the server, namely matching the sides with the longest distance from the two point set relative distance orders respectively according to a side length matching strategy, if the matching is in failure, ending, and if the matching is successful, obtaining a pair of matched sides; 405) calculating the distance between the points of the two point sets and each matched side obtained in the step 404) by using the server to obtain two point line distance orders. Compared with the prior art, the method has the advantages of convenience for operation, high work efficiency, strong applicability and the like.

Description

technical field [0001] The invention relates to a matching method, in particular to an automatic matching method for random point sets used for comparative analysis of industrial measurement design. Background technique [0002] In industrial measurement, the comparative analysis of measurement data and design data is very important. It is generally used to detect and evaluate the manufacturing error or deformation of industrial components. It mainly includes three application types: one is for regular geometric bodies (such as planes, spheres, etc.) The detection of geometric parameters is obtained by fitting and calculating the geometric measurement data, and then compared with the design parameters; the second is the detection of free-form surfaces of industrial components, generally by matching the measured point cloud data with the features of the three-dimensional design model of the workpiece or the curved surface Describe the realization of matching; the third is the...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 潘国荣郭巍张鹏
Owner TONGJI UNIV
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