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Fisheye lens calibration using virtual grid.

Aymen Arfaoui1, Simon Thibault

  • 1Department of Geomatics, Laval University, Québec, QC, Canada.

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This study introduces a new method for calibrating fisheye lenses using diffractive optical elements. The technique provides a reliable virtual calibration grid for accurate camera lens calibration.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • Fisheye lenses offer a wide field of view but require precise calibration for accurate 3D reconstruction.
  • Existing calibration methods can be complex and sensitive to environmental factors.
  • Diffractive optical elements offer unique light manipulation properties.

Purpose of the Study:

  • To develop and validate a novel technique for calibrating fisheye lenses.
  • To compare the performance of different fisheye lens mathematical models.
  • To evaluate the impact of image quantity on calibration accuracy.

Main Methods:

  • Utilized cross diffractive optical elements to generate a virtual calibration grid.
  • Implemented a camera rotation system around two axes for calibration.
  • Compared three distinct fisheye mathematical models.
  • Assessed calibration accuracy using a 3D calibration object.

Main Results:

  • The proposed technique using diffractive optical elements produced a robust and accurate virtual calibration grid.
  • Experimental data demonstrated the efficiency and reliability of the calibration method.
  • The study provided insights into the optimal number of images for the calibration process.
  • Comparative analysis of fisheye models was performed based on experimental results.

Conclusions:

  • The novel fisheye lens calibration technique is effective and reliable.
  • Diffractive optical elements provide a superior method for generating calibration grids.
  • The findings contribute to improved accuracy in applications utilizing fisheye lenses.