Aircraft skin clearance and scale measurement method based on parallel line structured light

Abstract

The invention discloses an aircraft skin clearance and scale measurement method based on parallel line structured light. The method is characterized by comprising the following steps: 1) calibrating acamera internal parameter and a structured light plane parameter; 3) enabling a camera to collecting a structured light image, and extracting clearance scale feature point of the aircraft skin in thestructured light stripe image, and recording the feature point 8-neighborhood gray information; 3) converting the feature point two-dimensional coordinate into a three-dimensional coordinate by usinga camera calibration result and a structured light plane calibration result; and 4) computing the clearance and scale value by using different methods according to the clearance and scale feature point 8-neighborhood gray information. The measurement method disclosed by the invention has the advantages as follows: 1) adopting a new calibration board to realize the synchronous calibration of the camera and the structured light plane, and improving the structured light measurement system calibration efficiency; and 2) considering the structured light stripe local geometric feature when computing the clearance and scale, improving the applicable range of the line structured light measurement system, and reducing the measurement error when being applied to the complex contour clearance scale.

Description

technical field [0001] The present invention relates to a kind of image processing technology, especially a kind of two-dimensional image processing or three-dimensional figure generation technology, specifically a kind of aircraft skin gap and step difference measurement method based on parallel line structured light. Background technique [0002] In aircraft assembly-related processes, skin to seam (step difference and gap formed between aircraft outer surface skin and skin, skin and structure, flap and structure, etc.) has a significant impact on the aerodynamic performance and stealth performance of the aircraft. Direct impact, so control and testing are required during assembly. [0003] As the requirements for the aerodynamic performance of the aircraft become higher and higher, the requirements for the gap and step difference between the skin joints also increase. Taking the aircraft skin as an example, the gap between seams and the accuracy of the step difference ar...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of narrow application range and high measurement error in the existing dual-structured light measurement, and can only solve the problem of measuring the gap and step difference of planar parts. The aircraft skin gap and step difference measurement method based on parallel line structured light based on skin-to-slit measurement, which not only broadens the application range of the dual structured light measurement model, but also improves the measurement accuracy

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