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Open AccessArticle

An Object-Oriented Color Visualization Method with Controllable Separation for Hyperspectral Imagery

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The School of Information and Communications Engineering, Dalian Minzu University, Dalian 116600, China
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The School of Information and Communications Engineering, Harbin Engineering University, Harbin 150001, China
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The Faculty of Electrical and Computer Engineering, University of Iceland, 102 Reykjavik, Iceland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3581; https://doi.org/10.3390/app10103581
Received: 27 April 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
Most of the available hyperspectral image (HSI) visualization methods can be considered as data-oriented approaches. These approaches are based on global data, so it is difficult to optimize display of a specific object. Compared to data-oriented approaches, object-oriented visualization approaches show more pertinence and would be more practical. In this paper, an object-oriented hyperspectral color visualization approach with controllable separation is proposed. Using supervised information, the proposed method based on manifold dimensionality reduction methods can simultaneously display global data information, interclass information, and in-class information, and the balance between the above information can be adjusted by the separation factor. Output images are visualized after considering the results of dimensionality reduction and separability. Five kinds of manifold algorithms and four HSI data were used to verify the feasibility of the proposed approach. Experiments showed that the visualization results by this approach could make full use of supervised information. In subjective evaluations, t-distributed stochastic neighbor embedding (T-SNE), Laplacian eigenmaps (LE), and isometric feature mapping (ISOMAP) demonstrated a sharper detailed pixel display effect within individual classes in the output images. In addition, T-SNE and LE showed clarity of information (optimum index factor, OIF), good correlation (ρ), and improved pixel separability (δ) in objective evaluation results. For Indian Pines data, T-SNE achieved the best results in regard to both OIF and δ , which were 0.4608 and 23.83, respectively. However, compared with other methods, the average computing time of this method was also the longest (1521.48 s). View Full-Text
Keywords: hyperspectral image; visualization; object-oriented approach; manifold methods hyperspectral image; visualization; object-oriented approach; manifold methods
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Liu, D.; Wang, L.; Benediktsson, J.A. An Object-Oriented Color Visualization Method with Controllable Separation for Hyperspectral Imagery. Appl. Sci. 2020, 10, 3581.

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