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. 2017 Oct 25;17(11):2442. doi: 10.3390/s17112442

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© 2017 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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Performance comparison of our proposed method with different feature combination, according to image sequence length $L_{l e n g t h}$ (spring vs. winter).