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. 2021 Jan 4;11(1):28. doi: 10.3390/jpm11010028

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© 2021 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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Overview of image augmentation procedure ((a): original image; (b): image rotated for 90 degrees around sagittal axis; (c): image rotated for 180 degrees around sagittal axis; (d): image rotated for 270 degrees around sagittal axis; (e): image rotated for 180 degree around longitudal axis; (f): image rotated for 180 degree around longitudal axis and rotated for 180 degree around sagittal axis; (g): image rotated for 180 degree around longitudal axis and rotated for 180 degree around sagittal axis; (h): image rotated for 180 degree around longitudal axis and rotated for 270 degree around sagittal axis; (i): image with pixels multiplied by a factor 0.8; (j): image with pixels multiplied by a factor 0.9; (k): image with pixels multiplied by a factor 1.1; (l): image with pixels multiplied by a factor 1.2).