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. 2018 Jul 4;14:52. doi: 10.1186/s13007-018-0320-9

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© The Author(s) 2018

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Unmixing methods on early and latewood of Spruce without background subtraction and based on 4 endmembers. Distribution maps given by all methods: from top to bottom VCA, NMF, MCR-ALS with no previous PCA and MCR-ALS with prior PCA. The images are scaled from minimum to maximum in each endmember. Black corresponds to the minimum intensity whereas white corresponds to the maximum