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. 2021 Jan 7;21:35. doi: 10.1186/s12935-020-01742-6

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Example image enhancement methods based on color and shape transformations. a Image rollover has alternating horizontal and vertical rollover components. Each time, one operation is randomly selected for image processing; b Processing of brightness image where the upper limit of the variation coefficient is set to 40, and an integer is randomly selected in the range [0–40] for brightness processing. c Processing of the saturation image where the range of the coefficient of change is set to [0.5,2], and the image color space is converted to the HSV space. A random value from the coefficient range is multiplied with the image in the saturation space each time. d Processing of the RGB color image where the coefficient of change is set to 60, the three R, G, B component values are randomly selected from [0,60]. In order to increase the image data variability, one or more of the four processing methods is are randomly selected each time