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. 2018 Jul 3;18(7):2143. doi: 10.3390/s18072143

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© 2018 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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Two source images and the filtered images via the guided filter. The guidance images are the source images themselves, and parameters r and $ϵ$ are set to three and 0.16, respectively.