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. 2016 Jul 8;10:350. doi: 10.3389/fnhum.2016.00350

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Copyright © 2016 Spehar, Walker and Taylor.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The original grayscale synthetic noise image with the 1/f slope of −1.5 (top) and −2.0 (bottom). (B) The thresholded variants of the grayscale images thresholded at relative luminance values of 0.1 (red), 0.3 (yellow), 0.5 (green), 0.7 (blue) and 0.9 (purple). (C) The contours extracted at the respective thresholded luminance values superimposed on the original grayscale image. The average fractal dimension of the contours in the top image equals 1.41 (ranging from 1.38 to 1.43) and 1.13 (ranging from 1.05 to 1.18) in the bottom image.