基于散焦图像的大视场立体视觉标定方法

doi:10.3969/j.issn.0255-8297.2019.06.004

Journal of Applied Sciences ›› 2019, Vol. 37 ›› Issue (6): 795-805.doi: 10.3969/j.issn.0255-8297.2019.06.004

• Signal and Information Processing • Previous Articles Next Articles

A Calibration Method Based on Defocused Image for Stereo Vision Sensor with Large FOV

YU Shuzhen¹, OU Qiaofeng¹, XIONG Bangshu¹, CHEN Yaofeng²

1. Key Laboratory of Image Processing and Pattern Recognition of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China;
2. Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institude, Jingdezhen 333000, Jiangxi Province, China

Received:2018-08-02 Revised:2019-03-13 Online:2019-11-30 Published:2019-12-06

Abstract

Abstract: A calibration method based on defocused image is proposed for stereo vision sensor with large field of view (FOV) to simplify operation process and gain accurate and steady camera calibration. First, a defocusing position is selected between the stereo vision system and the measurement position. The intrinsic parameters of cameras are obtained by using the template images at the defocusing position. Second, the external parameters of the stereo vision are obtained by using the template images at the measurement position. Finally, a laboratory calibration experiment and an experiment of measuring the helicopter blade motion parameters are conducted to verify the proposed method. Experimental results show that the method features in simple operation, high accuracy and reliability. In a field of 4.6 mm×2.3 mm, the mean error and the RMS error of a 505.00 mm distance between two feature points on the target are 0.647 mm and 0.780 mm respectively. Therefore this method can meet the requirements of onsite calibration with high-precision for the measurement of helicopter blade motion parameters.

Key words: stereo vision, vision measurement, vision calibration, large field of view, defocused image

CLC Number:

TP391.41

YU Shuzhen, OU Qiaofeng, XIONG Bangshu, CHEN Yaofeng. A Calibration Method Based on Defocused Image for Stereo Vision Sensor with Large FOV[J]. Journal of Applied Sciences, 2019, 37(6): 795-805.

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A Calibration Method Based on Defocused Image for Stereo Vision Sensor with Large FOV

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[1]	XIONG Bang-shu, LUO Yuan-hua, HUANG Jian-ping, LI Xin-min. Measurement Method of Torsion of Helicopter Rotor Blades Based on Stereo Vision [J]. Journal of Applied Sciences, 2018, 36(6): 950-957.
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