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. 2019 Jun 12;8:55. doi: 10.1038/s41377-019-0166-6

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© The Author(s) 2019

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. 3 — a Original ‘UR’ object. b Field distribution obtained by raster scanning. c Field distribution reconstructed by the HM algorithm. The bright central part of the ‘UR’ arises from the non-uniformly distributed THz field. d Reconstructed field obtained by random masks. e and f Recovered field obtained through the use of CS with different sampling ratios. All recovered fields have 64 × 64 sampling points with a pixel size of 64 μm