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. 2016 Aug 31;2016:13. doi: 10.1186/s13637-016-0048-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Two sets of features for Variant 6. 1st row illustrates the CIELAB features and their clusters of a normal face; 2nd row illustrates the CIELAB features and their clusters of a face with acne. Yellow circles are the results of applying Size Invariant circle detection. For above examples, 0 circle was found for the normal face; 119 circles were found for the acne featuring face