Feature adaptive laser scanning projection graph control point extraction and optimization method

Abstract

The invention discloses a feature adaptive laser scanning projection graph control point extraction and optimization method, which comprises the following steps: extracting a to-be-projected contour line from a theoretical mathematical model of a to-be-projected part, and storing the to-be-projected contour line as an IGES format file; analyzing the IGES format file to obtain three-dimensional coordinate information of data points on the contour line; and according to the curvature and the normal vector included angle of each adjacent point, dividing a feature region and a non-feature region of the to-be-projected graph, thereby realizing adaptive distribution of projection control points for different graph features. Meanwhile, a control point number dilution and optimization method based on human eye spatial resolution is researched; and the diluted and optimized point is used as a control point of the projection graph to realize the projection of the contour wireframe graph. According to the invention, adaptive distribution of the density of the projection points can be carried out according to the characteristic change degree of the projection graph, and sufficient scanning projection graph shape accuracy can still be ensured on the premise that the minimum scanning control points are used.

Description

technical field [0001] The invention belongs to the field of advanced photoelectric testing instruments, and in particular relates to a feature-adaptive laser scanning projection graphic control point extraction and optimization method, which is specifically applied to intelligent auxiliary assembly positioning in the field of advanced manufacturing and assembly. Background technique [0002] Modern manufacturing has high requirements for production speed and efficiency. Rapid production, mass customization and flexible manufacturing of products are central themes of modern production. However, the on-site assembly process of large and complex products is still mostly done manually by skilled operators, and the production assembly efficiency and product quality level cannot fully meet the development requirements of modern manufacturing. The laser scanning projection system can assist operators in precise positioning of parts and auxiliary assembly operations, which can gre...

AI Technical Summary

Problems solved by technology

However, the commonly used method of simplification and optimization using point geometric parameter information is applied to the simplification process of projected graphic points, and there will be graphics missing and blank phenomena, and it is impossible to retain points according to projected graphic features while ensuring the accuracy of projected graphics.

[0005] The more serious problem is that the flickering and missing phenomena of the above-mentioned projection graphics will seriously affect the accuracy of assembly and positioning of parts, causing deviations in assembly results, slowing down assembly work efficiency, and reducing the practical value of the laser scanning projection system at the manufacturing and assembly site

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