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. 2017 Jan 17;17:6. doi: 10.1186/s12880-016-0176-2

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© The Author(s). 2017

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. 5 — An illustration of ∑⁴_j = 1 b _j ≈ 1. a A synthetic image of size 256 × 256 in which the red solid wireframe draws out a local region of size 9 × 9; b Repeated pixels of each x _j and y are indicated by an arrow; Collections of all of pixels from x _j and y were displayed in (c-g) respectively