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. 2021 Mar 2;12:1184. doi: 10.1038/s41467-021-21326-w

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© The Author(s) 2021, corrected publication 2021

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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Fig. 6 — Virtual unfolding results for unopened letter DB-1627 (a, b) and opened letter DB-2040, showing a XMT-textured image after virtual unfolding (this image has been inverted and linearly scaled to increase contrast of text and other details, such as a visible watermark in the center and laid and chain lines of the handmade paper); b crease pattern image; and c a close-up view of a portion of the final texturing results for opened letter DB-2040 (inverted and linearly scaled), compared to d a photograph demonstrates low geometric distortion of the virtually flattened result across a crease (indicated by the dashed blue line). Scale bars: a 10 mm, b 50 mm, c, d 10 mm.