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http://dx.doi.org/10.3807/KJOP.2012.23.5.179

The Study of Fisheye Lens for the Causes of Rapid Illumination Drop and the Ways to Correct on an Image Sensor due to an Ultra Wide Angle of View  

Rim, Cheon-Seog (Department of Applied Optics and Electromagnetics, Hannam University)
Publication Information
Korean Journal of Optics and Photonics / v.23, no.5, 2012 , pp. 179-188 More about this Journal
Abstract
Lenses with an ultra wide angle of view are usually called fisheye lenses since a fish can see an ultra wide panoramic view under water. As the angle of view for these kinds of lenses reaches a wide angle, the illumination on an image sensor is reduced by a rapid drop. In this paper, we discuss the causes and the ways to correct for a rapid drop. First, it is treated for the sign convention of directional cosine vectors and normal vectors on the curved surface by means of analytic geometry. And, from the fundamental discussion for these vectors, the rapid illumination drop is numerically analyzed for various kinds of causes by utilizing geometrical optics and radiometry as well as Fresnel equations derived from electromagnetic boundary conditions. As a result, we are able to get the full understanding for the rapid illumination drop and to propose ways to correct effects due to an wide angle of view.
Keywords
Fisheye lens; Sign convention; Fresnel equation; Multilayer film coating;
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