A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

Author:

Liu Wei,Ma Xin,Li Xiao,Pan Yi,Wang Fuji,Jia Zhenyuan

Abstract

Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow influence, which will lead to a big measurement error. In this paper, to further improve the vision-based pose measurement accuracy, an imaging model which considers the refraction light of the observation window was proposed. In this method, a nonlinear camera calibration model considering the refraction brought by the wind tunnel observation window, was established first. What’s more, a new method for the linear calibration of the normal vector of the glass observation window was presented. Then, combining with the proposed matching method based on coplanarity constraint, the six pose parameters of the falling target could be calculated. Finally, the experimental setup was established to conduct the pose measurement study in the laboratory, and the results satisfied the application requirements. Besides, experiments for verifying the vision measurement accuracy were also performed, and the results indicated that the displacement and angle measurement accuracy approximately increased by 57% and 33.6%, respectively, which showed the high accuracy of the proposed method.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

Reference23 articles.

1. A Vision-Based Dynamic Rotational Angle Measurement System for Large Civil Structures

2. Position and attitude measuring method of auxiliary tank based on color-coding method in wind tunnel environment;Liu;Acta Aeronaut. Astronaut. Sin.,2014

3. Simulative technology for auxiliary fuel tank separation in a wind tunnel

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