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. 2014 Feb 17;14(2):3095–3129. doi: 10.3390/s140203095

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 7. — Retinex images obtained using various sigma values with images from database I: (a) the original image with the detected finger boundaries; Retinex images obtained using sigma values of (b) 10, (c) 15, (d) 20, (e) 25, and (f) 50.