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. 2021 Aug 27;8:733468. doi: 10.3389/fmed.2021.733468

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Copyright © 2021 Chen, Liu, Du and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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AI in measurement of NT thickness (12, 13). (a) Original image, (b) after histogram equalization, (c–e) detection results of different methods (directional edge image, SRAD edge image, and KAD edge image), (f) binary the direction edge image.