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. 2018 Nov 12;8:16711. doi: 10.1038/s41598-018-34652-9

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© The Author(s) 2018

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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The effect of contrast enhancement on 2D images compared with raw data at different SNRs. (A) The projection images of ModB₂C₂ at SNR = 0.80, 0.50, and 0.30. The first row shows the raw images. The second row shows images after contrast enhancement. The third row shows the FRC curves between the corresponding raw images and their enhanced images. (B) The projection images and their corresponding enhanced images of CETP at SNR = 0.80, 0.50, and 0.30. Scale bars are 5 nm.