• 中国计算机学会会刊
  • 中国科技核心期刊
  • 中文核心期刊

Computer Engineering & Science

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An self-calibration optimization algorithm
 for 3D reconstruction of X-ray images

ZHANG Bo-lin1,LIU Rong-hai2,ZHENG Xin2,YANG Ying-chun2,CHEN Lei1,WAN Shu-ting1   

  1.  (1.School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003;
    2.Electricity Science Research Institute of Yunnan Power Grid Company Limited,Kunming 650000,China)
     
  • Received:2018-08-28 Revised:2019-01-21 Online:2019-08-25 Published:2019-08-25

Abstract:

According to the imaging characteristics of X-ray images, we propose a self-calibration method for 3D reconstruction of X-ray images. Firstly, the matching relationship of profiles between two adjacent X-ray images is obtained by using the SIFT algorithm. Then, the fundamental matrix is achieved by calculation according to the matching relationship. Thirdly, the initial values of the intrinsic parameters of the X-ray non-destructive testing equipment are estimated by using the fundamental matrix. Finally, the intrinsic parameters are optimized based on the improved Kruppa equation, and the intrinsic self-calibration parameters of the 3D reconstruction of the X-ray image are obtained. According to the intrinsic parameters before and after optimization, the 3D models are established. Comparative experiments are carried out from two aspects: shape and key dimension error, which proves that the optimized intrinsic parameters have higher precision and reliability.

Key words: self-calibration , optimization algorithm;X-ray image;intrinsic parameter;SIFT;3D reconstruction