An Image Warping Method for Implementation of an Embedded Lens Distortion Correction Algorithm


The KIPS Transactions:PartB , Vol. 10, No. 4, pp. 373-380, Aug. 2003
10.3745/KIPSTB.2003.10.4.373,   PDF Download:

Abstract

Most of low cost digital cameras reveal relatively high lens distortion. The purpose of this research is to compensate the degradation of image quality due to the geometrical distortion of a lens system. The proposed method consists of two stages : calculation of a lens distortion coefficient by a simplified version of Tsai´s camera calibration and subsequent image warping of the original distorted image to remove geometrical distortion based on the calculated lens distortion coefficient. In the lens distortion coefficient calculation stage, a practical method for handling scale factor ratio and image center is proposed, after which its feasibility is shown by measuring the performance of distortion correction using a quantitative image quality measure. On the other hand, in order to apply image warping via inverse spatial mapping using the result of the lens distortion coefficient calculation stage, a cubic polynomial derived from an adopted radial distortion lens model must be solved. In this paper, for the purpose of real-time operation, which is essential for embedding into an information device, an approximated solution to the cubic polynomial is proposed in the form of a solution to a quadratic equation. In the experiment, potential for real-time implementation and equivalence in performance as compared with that from cubic polynomial solution are shown.


Statistics
Show / Hide Statistics

Statistics (Cumulative Counts from September 1st, 2017)
Multiple requests among the same browser session are counted as one view.
If you mouse over a chart, the values of data points will be shown.


Cite this article
[IEEE Style]
Y. W. Pil and C. Y. Koo, "An Image Warping Method for Implementation of an Embedded Lens Distortion Correction Algorithm," The KIPS Transactions:PartB , vol. 10, no. 4, pp. 373-380, 2003. DOI: 10.3745/KIPSTB.2003.10.4.373.

[ACM Style]
Yu Won Pil and Chung Yun Koo. 2003. An Image Warping Method for Implementation of an Embedded Lens Distortion Correction Algorithm. The KIPS Transactions:PartB , 10, 4, (2003), 373-380. DOI: 10.3745/KIPSTB.2003.10.4.373.