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. 2010 Jul 26;10(8):7067–7081. doi: 10.3390/s100807067

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© 2010 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 4. — A selection of images with defects and different illumination conditions (a), (c), (e), (g), their corresponding histograms and determination of the HRBD (b), (d), (f), (h).