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Sensors 2017, 17(3), 441; doi:10.3390/s17030441

A Weighted Spatial-Spectral Kernel RX Algorithm and Efficient Implementation on GPUs

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China
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Author to whom correspondence should be addressed.
Academic Editor: Ram M. Narayanan
Received: 22 January 2017 / Revised: 19 February 2017 / Accepted: 20 February 2017 / Published: 23 February 2017
(This article belongs to the Section Remote Sensors)
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Abstract

The kernel RX (KRX) detector proposed by Kwon and Nasrabadi exploits a kernel function to obtain a better detection performance. However, it still has two limits that can be improved. On the one hand, reasonable integration of spatial-spectral information can be used to further improve its detection accuracy. On the other hand, parallel computing can be used to reduce the processing time in available KRX detectors. Accordingly, this paper presents a novel weighted spatial-spectral kernel RX (WSSKRX) detector and its parallel implementation on graphics processing units (GPUs). The WSSKRX utilizes the spatial neighborhood resources to reconstruct the testing pixels by introducing a spectral factor and a spatial window, thereby effectively reducing the interference of background noise. Then, the kernel function is redesigned as a mapping trick in a KRX detector to implement the anomaly detection. In addition, a powerful architecture based on the GPU technique is designed to accelerate WSSKRX. To substantiate the performance of the proposed algorithm, both synthetic and real data are conducted for experiments. View Full-Text
Keywords: anomaly detection; graphics processing units (GPUs); hyperspectral imaging; kernel mapping; spatial-spectral information; parallel processing anomaly detection; graphics processing units (GPUs); hyperspectral imaging; kernel mapping; spatial-spectral information; parallel processing
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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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Zhao, C.; Li, J.; Meng, M.; Yao, X. A Weighted Spatial-Spectral Kernel RX Algorithm and Efficient Implementation on GPUs. Sensors 2017, 17, 441.

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