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Keywords:

  • singlet lens;
  • distortion correction;
  • field-dependent distortion coefficient;
  • backward mapping

Abstract

This paper introduces approaches to deal with distortion created by a singlet lens camera. Due to the inherent optical defect of singlet lenses, considerable lens aberrations will appear in the resulting image, especially at high field angles. Among the well-known five monochromatic aberrations and two chromatic aberrations, distortion and blurring are the most obvious aberrations for the designed singlet lens. In this paper, we deal with two techniques for distortion correction: field-dependent distortion coefficient and backward mapping method. The former will produce more accurate correction than obtained using third-order coefficient and constant coefficients. The latter does not need additional interpolation process to fill up pixel vacancies and higher precision of pixel values can be obtained compared with our previous forward mapping method. Simulation results indicate the superiority of the proposed two techniques. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.