吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (2): 540-545.doi: 10.13229/j.cnki.jdxbgxb201702027

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Calibration of line array camera for head defect detection system on cylinder cover

ZHANG Fei1, SHAN Zhong-de1, REN Yong-xin2, NIE Jun-gang2, LIU Feng2   

  1. 1.State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science Technology, Beijing 100083,China;
    2.Advanced Manufacture Technology Center, China Academy of Machinery Science Technology, Beijing 100083,China
  • Received:2016-03-11 Online:2017-03-20 Published:2017-03-20

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Abstract: In order to detect surface defect of engine cylinder head, accuracy size data of the surface is needed. A visual detect device of engine cylinder head is designed, and a new calibration method is proposed for the purpose of correcting the linear array camera lens distortion. First, according to the detecting requirements, height and angle data of the linear array camera is determined using high-accuracy detection system. Second, by establishing the mathematical model of the linear array camera image, ignoring the distortion, the image center coordinates with respect to the optical axis are obtained, and the camera parameters are acquired by least square method. Finally, considering lens distortion, a mathematical distortion model is established. The obtained parameters are used as the initial values to solve the distortion parameters using minimum error method. Experimental results indicate that this algorithm can get higher accuracy and stability. The maximum distortion is less than ±0.25 pixel, and the average measuring error is 0.356%, which can meet the requirements of practical engineering and has high practical value.

Key words: technology of instrument and meter, camera calibration, lens distortion calibration, machine vision, geometrical parameter

CLC Number: 

  • TH741
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