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. 2015 Jun 15;15(6):14093–14115. doi: 10.3390/s150614093

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© 2015 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/4.0/).

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Accurately recognized banknotes and their sub-sampled images: (a) Direction A with $100; (b) Direction B with recent $50; (c) Direction C with recent $100; and (d) Direction D with recent $10.

Accurately recognized banknotes and their sub-sampled images: (a) Direction A with $100; (b) Direction B with recent $50; (c) Direction C with recent $100; and (d) Direction D with recent $10.