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Remote Sens. 2019, 11(7), 864; https://doi.org/10.3390/rs11070864

Unsupervised Feature-Learning for Hyperspectral Data with Autoencoders

1
Australian Centre for Field Robotics, University of Sydney, Sydney 2006, Australia
2
Baymatob Operations Pty Ltd, Leichhardt, Sydney 2040, Australia
*
Author to whom correspondence should be addressed.
Work done while at Australian Centre for Field Robotics.
Received: 27 February 2019 / Revised: 27 March 2019 / Accepted: 3 April 2019 / Published: 10 April 2019
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Abstract

This paper proposes novel autoencoders for unsupervised feature-learning from hyperspectral data. Hyperspectral data typically have many dimensions and a significant amount of variability such that many data points are required to represent the distribution of the data. This poses challenges for higher-level algorithms which use the hyperspectral data (e.g., those that map the environment). Feature-learning mitigates this by projecting the data into a lower-dimensional space where the important information is either preserved or enhanced. In many applications, the amount of labelled hyperspectral data that can be acquired is limited. Hence, there is a need for feature-learning algorithms to be unsupervised. This work proposes unsupervised techniques that incorporate spectral measures from the remote-sensing literature into the objective functions of autoencoder feature learners. The proposed techniques are evaluated on the separability of their feature spaces as well as on their application as features for a clustering task, where they are compared against other unsupervised feature-learning approaches on several different datasets. The results show that autoencoders using spectral measures outperform those using the standard squared-error objective function for unsupervised hyperspectral feature-learning. View Full-Text
Keywords: autoencoders; unsupervised feature-learning; hyperspectral; deep learning autoencoders; unsupervised feature-learning; hyperspectral; deep learning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Windrim, L.; Ramakrishnan, R.; Melkumyan, A.; Murphy, R.J.; Chlingaryan, A. Unsupervised Feature-Learning for Hyperspectral Data with Autoencoders. Remote Sens. 2019, 11, 864.

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