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. 2020 Jun 29;20(13):3641. doi: 10.3390/s20133641

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© 2020 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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(a) FAST-based feature matching of the spine for two image views for Patient 15. (b) ORB-based feature matching of the spine for two image views for Patient 15. (c) SURF-based feature matching of the spine for two image views for Patient 15. (d) MSER-based feature matching of the spine for two image views for Patient 15.