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. 2015 Dec 23;16(1):13. doi: 10.3390/s16010013

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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 by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Selected images from fringe sequence: parts of Gray-code sequence (a,c) and sinusoidal fringes (b,d) taken from underwater measurements of a frustum of a pyramid.