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. 2018 Aug 21;20(9):625. doi: 10.3390/e20090625

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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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Figure A1 — An example to approximate the number of paths between a source pixel $P_{s}$ and a target pixel $P_{t}$ : (a) the connecting region between $P_{s}$ and $P_{t}$ ; and (b) the transform graph.