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. 2021 Feb 18;21(4):1434. doi: 10.3390/s21041434

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Outer and inner boundary estimation comparison of the proposed method with other works on challenging image. (a) Proposed method; (b) Li et al. [4]; (c) Li and Huang [8]; (d) Duda and Hart [46], respectively.