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. 2019 May 17;21(5):504. doi: 10.3390/e21050504

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© 2019 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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Correlation plots of the R channel of the plain image in the (a) horizontal, (b) vertical, and (c) diagonal directions; G channel of the plain image in the (g) horizontal, (h) vertical, and (i) diagonal directions; B channel of the plain image in the (m) horizontal, (n) vertical, and (o) diagonal directions; R channel of the cipher image in the (d) horizontal, (e) vertical, and (f) diagonal directions; G channel of the cipher image in the (j) horizontal, (k) vertical, and (l) diagonal directions; B channel of the cipher image in the (p) horizontal, (q) vertical, and (r) diagonal directions.

Correlation plots of the R channel of the plain image in the (a) horizontal, (b) vertical, and (c) diagonal directions; G channel of the plain image in the (g) horizontal, (h) vertical, and (i) diagonal directions; B channel of the plain image in the (m) horizontal, (n) vertical, and (o) diagonal directions; R channel of the cipher image in the (d) horizontal, (e) vertical, and (f) diagonal directions; G channel of the cipher image in the (j) horizontal, (k) vertical, and (l) diagonal directions; B channel of the cipher image in the (p) horizontal, (q) vertical, and (r) diagonal directions.