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Single-axis rotation angle vision measurement method based on fixed camera and single target

A technology of fixed camera and visual measurement, which is applied in the field of visual measurement, can solve problems such as difficult target installation, and achieve the effect of solving difficult target installation and good practicability

Active Publication Date: 2015-02-25
BEIHANG UNIV
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Problems solved by technology

It solves the problem of difficult target installation in existing visual goniometric methods

Method used

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  • Single-axis rotation angle vision measurement method based on fixed camera and single target
  • Single-axis rotation angle vision measurement method based on fixed camera and single target
  • Single-axis rotation angle vision measurement method based on fixed camera and single target

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Embodiment Construction

[0105] See figure 1 — Image 6 , the present invention provides a visual measurement method based on a fixed camera and a single-axis rotation angle of a single target, and has been verified by simulation experiments and real experiments.

[0106] Simulation

[0107] The simulation experiment was carried out on a computer with a main frequency of 3.07GHz and a memory of 4.00GB, and MATLAB2014a under Windows XP environment. The camera model used in the simulation is a second-order distortion model, and the parameters are as follows:

[0108] alpha x =782.5109,α y =782.9155,u 0 =357.3909, v 0 =264.5240

[0109] k 1 =-0.4232,k 2 =0.2664,k 3 =-0.000555,k 4 =-0.0031,k 5 =0

[0110] The target is a 6×8 checkerboard, and the length of a single checkerboard is 39.5mm×39.5mm. The simulation experiment mainly verifies the stability and high precision of the calibration algorithm. The simulation steps are as follows:

[0111] Simulation environment setting: According to ...

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Abstract

The invention provides a single-axis rotation angle vision measurement method based on a fixed camera and a single target. The method includes the four steps of firstly, calibrating internal parameters and external parameters of the camera; secondly, obtaining the initial values of the external parameters related to pivoting movement; thirdly, conducting nonlinear optimization on the internal parameter pin and the external parameter pout; fourthly, measuring the rotation angle through the calibrated internal parameters and the calibrated external parameters. The method is a method for measuring the rotation angle of the pivoting movement through the monocular camera, and solves the problem that the target is hard to install in an existing angle vision measurement method; meanwhile, the method is suitable for the conditions with blockage as well and is quite high in practicability.

Description

technical field [0001] The invention relates to a visual measurement method based on a fixed camera and a single-axis rotation angle of a single target, belonging to the technical field of visual measurement. Background technique [0002] Angular displacement measurement is widely used in industry, aerospace and other fields. Since the electrical and mechanical parameters of the angular displacement sensor will change in harsh environments, it is necessary to calibrate and correct them regularly. Vision measurement technology is popular because of its simple structure, non-contact real-time measurement, and convenient on-site installation and debugging. The existing visual angle measurement methods are divided into binocular vision and monocular vision methods. The binocular vision method is greatly limited due to its small public field of view and complicated installation. Most of the existing monocular vision methods have certain requirements for the installation of the...

Claims

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Application Information

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IPC IPC(8): G01B11/26
Inventor 全权董洪信张瑞峰付强蔡开元
Owner BEIHANG UNIV
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