Binocular vision-based large-dimensional geometric quantity measurement method

A measurement method and binocular vision technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of cumbersome operation process, complicated program algorithm, etc., meet the accuracy requirements, overcome the complicated coding process, and realize accurate identification and identification. The effect of positioning

Inactive Publication Date: 2016-10-12
SHENYANG AIRCRAFT CORP
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AI Technical Summary

Problems solved by technology

[0004] Most of the above-mentioned existing visual measurement methods use a combination of multiple equipments and coded marker points to realize

Method used

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  • Binocular vision-based large-dimensional geometric quantity measurement method
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  • Binocular vision-based large-dimensional geometric quantity measurement method

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Embodiment Construction

[0027] A large-scale geometric quantity measurement method based on binocular vision, the specific method has the following four parts:

[0028] 1. System Calibration

[0029] In order to reduce the positioning error of the principal point of the camera, the present invention uses the combination of the active vision method and the plane calibration method to complete the calibration of the system parameters.

[0030] Such as figure 2 As shown, the active vision calibration device is composed of a six-degree-of-freedom table 1, a camera 2, a rotating platform 3, and a vibration-absorbing table 4. Active Vision Utilization figure 2 The six-degree-of-freedom workbench 1 shown drives the camera to perform a specific movement to achieve accurate calibration of the principal point of the camera, and then substitutes the calibrated principal point data into the plane calibration method (the plane calibration method was proposed by Zhang Zhengyou, which is convenient and flexible...

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Abstract

The invention provides a binocular stereoscopic vision station-transfer measurement-based large-dimensional geometric quantity measurement method. The objective of the invention is to solve problems in large-dimensional geometric quantity measurement in the manufacture field of large equipment such as airplanes and ships. The method includes the following steps that: a plane target and active vision combined calibration method is adopted to obtain visual system parameters through precise calibration, and therefore, the defect of the poor stability of the principal point of a camera caused by inaccurate positioning of an angular point can be elinminated; with a non-coding origin adopted as a measuring point, a circularity method and a fitting method are adopted to realize the identification and circular positioning of the origin, and an epipolar constraint method and a crossratio constraint method are combined to match high-density similar dots; and an SVD method is used to solve a splicing matrix between adjacent stations, and data splicing can be completed. As indicated by a test result, the relative error of the measurement result of the method and a numerical value measured by a coordinate measurement machine is smaller than 0.1%.

Description

technical field [0001] The invention relates to the measurement of large-scale geometric quantities in the field of large-scale equipment manufacturing such as aircraft and ships, and proposes a large-scale geometric quantity measurement method based on binocular stereo vision transfer station measurement. Background technique [0002] The development of modern industrial production process has made the detection methods not only limited to conventional dimensions, but also the measurement of unconventional dimensions such as large-scale geometric quantities has gradually become a research hotspot. Large-scale measurement usually refers to the measurement of the measured target with a size exceeding 500mm. Since the measurement size exceeds the conventional measurement range, it is difficult to ensure the rapidity of the detection process and the accuracy of the measurement results at the same time. Existing large-scale measuring equipment such as large-scale three-coordinat...

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00G01B11/002
Inventor 刘洪霞张敏柳晓璇尹燊
Owner SHENYANG AIRCRAFT CORP
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