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. 2018 Nov 10;18(11):3873. doi: 10.3390/s18113873

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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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Result matrices: (a) processed without the segmentation and averaging when the human target stood 3 m behind the wall; (b) processed with the breath enhancement algorithm when the human target stood 3 m behind the wall; (c) processed without the segmentation and averaging when the human target stood 7 m behind the wall; (d) processed with the breath enhancement algorithm when the human target stood 7 m behind the wall; (e) processed without the segmentation and averaging when the human target stood 9 m behind the wall; and, (f) processed with the breath enhancement algorithm when the human target stood 9 m behind the wall.