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. 2017 Jan 10;7:40169. doi: 10.1038/srep40169

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The panels (A,B) show the reference image and the image to be registered. The panel (C) shows overlaying of both the images, the gray part corresponds to the difference between the images. The panel (D) shows the difference on itself. As the patterns are 3 × 3 pixels, the difference part corresponds to SSD of 4.