Target boundary extraction method based on laser stripe geometric feature mutation

Abstract

The invention belongs to a target boundary extraction method based on laser stripe geometric feature mutation, which belongs to the field of visual measurement. The method comprises steps: a mode of combining laser and binocular vision is firstly adopted to acquire a laser stripe image; according to a boundary laser stripe condition existing in an actual measurement process, three kinds of boundary models are built; differentiate operation is used to carry out derivation on a boundary eigenvector, and target boundary feature point coordinates through rough extraction are obtained; and according to a moment invariance principle, target boundary feature point coordinates through fine extraction are obtained, and quick and high-precision extraction on the target boundary is realized. The method overcomes phenomena that during the existing boundary extraction process, many noisy points are generated at the boundary of two ends of the laser stripe, and due to influences of a spatial position relationship, the laser stripe is bent, dislocated or broken and disconnected and the gray distribution level and the width presented by the laser stripe are different, and quick and high-precision target boundary extraction is realized.

Description

technical field [0001] The invention belongs to the field of visual measurement, and relates to a target boundary extraction method based on sudden changes in the geometric characteristics of light bars. Background technique [0002] For the three-dimensional measurement of large aerospace components (such as aircraft flat and vertical tail parts, etc.) in accordance with. In the data acquisition process of the laser measurement system, theoretically, the line laser beam has a Gaussian distribution along the cross-sectional direction, and the light intensity distribution along the light strip direction is uniform and has a consistent width within a certain range. However, in the actual measurement process, there are mainly five boundary light stripe conditions: light stripe bending, light stripe misalignment, light stripe disconnection, light stripe gray scale mutation, and light stripe width mutation. [0003] Due to the complex environment of the measurement site, the ma...

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Problems solved by technology

[0006] In order to solve the limitations in the process of measuring the boundary profile information of large aeronautical components in the assembly process under the existing large field of view, the present invention invented a boundary extraction method based on the sudden change of the geometric characteristics of the laser light strip

It overcomes the many noise points at both ends of the light strip during the existing boundary extraction process; due to the influence of the spatial position relationship, the laser light strip presents bending, dislocation or disconnection and discontinuity; the gray level of the light strip presents And the width is not the same problem, has a wide range of application prospects

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