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. 2016 Dec 19;16(12):2185. doi: 10.3390/s16122185

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Intensity profiles corresponding to all four target locations and obtained using the fisheye lens system. The intensity profiles in the (a) vertical and horizontal directions when a LED light place was placed in the center position, intensity profiles in the (b) vertical and horizontal directions when a LED light place was placed in the horizontal position, intensity profiles in the (c) vertical and horizontal directions when a LED light place was placed in the vertical position, and intensity profiles in the (d) vertical and horizontal directions when a LED light place was placed in the diagonal position.