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. 2017 Jul 8;17(7):1598. doi: 10.3390/s17071598

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© 2017 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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Example of various images in the experimental DVLFPD-DB1 used in this study: (a) Sub-database 1, (b) Sub-database 2, (c) Sub-database 3, and (d) Sub-database 4.

Example of various images in the experimental DVLFPD-DB1 used in this study: (a) Sub-database 1, (b) Sub-database 2, (c) Sub-database 3, and (d) Sub-database 4.