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Proceedings Paper

Distortion control for panoramic annular lens with Q-type aspheres
Author(s): Xiangdong Zhou; Jian Bai
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Paper Abstract

As in fisheye lens, panoramic annular lens (PAL) has a big barrel distortion due to its large field of view. That has an apparent effect to its imaging performance such as pixel utilization and image resolution. If we manage to control the barrel distortion instead of only increasing it, the resulting system can gain better performance. In this paper we propose a method to control distortion that using Q-type aspheres. First, the Q-type aspheric polynomials and its advantages are introduced in the aspect of algorithm and fabrication relative to the traditional symmetrical polynomial-based aspheres. Then, an example design of PAL with Q-type aspheres using ZEMAX optical design package is presented. The designed PAL’s focal length is -1.25mm, F Number is about 5, distortion in all the fields of view are less than 1% under the f-θ distortion formation. The imaging quality of the optical system approached to diffraction limit. The result shows that Q-type aspheres has certain advantage in distortion control for PAL that can enhance imaging performance.

Paper Details

Date Published: 5 November 2014
PDF: 6 pages
Proc. SPIE 9272, Optical Design and Testing VI, 92721D (5 November 2014); doi: 10.1117/12.2071692
Show Author Affiliations
Xiangdong Zhou, Zhejiang Univ. (China)
Jian Bai, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 9272:
Optical Design and Testing VI
Yongtian Wang; Chunlei Du; José Sasián; Kimio Tatsuno, Editor(s)

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