As the performance of the previous distortion correction methods is not well for the wide-angel lens, we present a two-step correction algorithm for wide-angle distortion by using the Division Model and the coherent detection. In our algorithm, a grid template is used as the calibration target. Firstly, we approximate the distortion characteristic of wide-angle lens with single parameter Division Model, and then fit the distorted straight line with a circular arc to calculate the distortion parameter and distorted center. Secondly, we correct the residually distorted image, which is gotten from the previous step, with coherent detection to compensate the error between Division Model and the distortion characteristics of wide-angle lens. The quantitative assessment and experiment results show that the presented distortion correction algorithm is easy to achieve and has high accuracy.

Date Published: 19 February 2015
PDF: 8 pages
Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 944929 (19 February 2015); doi: 10.1117/12.2075892

Published in SPIE Proceedings Vol. 9449:
The International Conference on Photonics and Optical Engineering (icPOE 2014)
Ailing Tian; Anand Asundi; Weiguo Liu; Chunmin Zhang, Editor(s)