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. 2013 May 10;13(5):6109–6140. doi: 10.3390/s130506109

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© 2013 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 18. — Area measurement (in pixels) of a circular object at different distances. Theoretical and experimental values are shown for the relative area (changes with distance) and the absolute area.