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. 2018 May 10;18(5):1501. doi: 10.3390/s18051501

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© 2018 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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Difference in frequency between iris and non-iris classes. (a) NICE-II original input image. (b) Difference in frequency of iris and non-iris pixels in NICE-II training dataset.