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Sensors 2018, 18(3), 693; https://doi.org/10.3390/s18030693

An Unsupervised Deep Hyperspectral Anomaly Detector

1
Department of Automatic Test and Control, School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
2
School of Electrical and Information Engineering, The University of Sydney, Sydney 2006, Australia
*
Author to whom correspondence should be addressed.
Received: 29 November 2017 / Revised: 18 February 2018 / Accepted: 22 February 2018 / Published: 26 February 2018
(This article belongs to the Section Remote Sensors)
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Abstract

Hyperspectral image (HSI) based detection has attracted considerable attention recently in agriculture, environmental protection and military applications as different wavelengths of light can be advantageously used to discriminate different types of objects. Unfortunately, estimating the background distribution and the detection of interesting local objects is not straightforward, and anomaly detectors may give false alarms. In this paper, a Deep Belief Network (DBN) based anomaly detector is proposed. The high-level features and reconstruction errors are learned through the network in a manner which is not affected by previous background distribution assumption. To reduce contamination by local anomalies, adaptive weights are constructed from reconstruction errors and statistical information. By using the code image which is generated during the inference of DBN and modified by adaptively updated weights, a local Euclidean distance between under test pixels and their neighboring pixels is used to determine the anomaly targets. Experimental results on synthetic and recorded HSI datasets show the performance of proposed method outperforms the classic global Reed-Xiaoli detector (RXD), local RX detector (LRXD) and the-state-of-the-art Collaborative Representation detector (CRD). View Full-Text
Keywords: hyperspectral image; deep learning; anomaly detection hyperspectral image; deep learning; anomaly detection
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Ma, N.; Peng, Y.; Wang, S.; Leong, P.H.W. An Unsupervised Deep Hyperspectral Anomaly Detector. Sensors 2018, 18, 693.

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