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Volume 40 Issue 4
Apr.  2014
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(4): 558-563.
Zhao Yuntao, Sun Junhua, Chen Xu, et al. Camera calibration from geometric feature of spheres[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(4): 558-563. doi: 10.13700/j.bh.1001-5965.2013.0293(in Chinese)
Citation: Zhao Yuntao, Sun Junhua, Chen Xu, et al. Camera calibration from geometric feature of spheres[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(4): 558-563. doi: 10.13700/j.bh.1001-5965.2013.0293(in Chinese)
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Camera calibration from geometric feature of spheres

doi: 10.13700/j.bh.1001-5965.2013.0293

  • Precision Opto-mechatronics Technology Key-laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 27 May 2013
  • Publish Date: 20 Apr 2014
    Abstract
  • Camera calibration with spheres has little demand on image number, camera shooting angle and high adaptivity to occlusion, which has an obvious advantage in applications. A novel camera calibration method was proposed based on geometric feature of sphere projection model. This algorithm used two projection conics of spheres and solved the intrinsic parameters of the camera. The projection conics were obtained from image of two spheres at different positions. The symmetry axis and common tangent of the projection conics were used to solve the principal point and the projections of sphere centers. Then normalized focal length was computed based on geometric relationship of the principal point and projection of sphere center. Finally intrinsic parameters were obtained using optimization algorithm. Simulation data experiments analyze the main error factors and real data results show that the proposed method is reliable and the error is less than 5% comparing with planar target method.

     

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    • References(13)
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