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Hyperspectral Anomaly Detection via Spatial Density Background Purification

School of Information Science and Technology, Hunan Institute of Science and Technology, Yueyang 414000, China
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These authors contributed equally to this work.
Remote Sens. 2019, 11(22), 2618; https://doi.org/10.3390/rs11222618
Received: 15 September 2019 / Revised: 2 November 2019 / Accepted: 3 November 2019 / Published: 8 November 2019
In the research of anomaly detection methods, obtaining a pure background without abnormal pixels can effectively improve the detection performance and reduce the false-alarm rate. Therefore, this paper proposes a spatial density background purification (SDBP) method for hyperspectral anomaly detection. First, a density peak clustering (DP) algorithm is used to calculate the local density of pixels within a single window. Then, the local densities are sorted into descending order and the m pixels that have the highest local density are selected from high to low. Therefore, the potential abnormal pixels in the background can be effectively removed, and a purer background set can be obtained. Finally, the collaborative representation detector (CRD) is employed for anomaly detection. Considering that the neighboring area of each pixel will have homogeneous material pixels, we adopt the double window strategy to improve the above method. The local densities of the pixels between the large window and the small window are calculated, while all pixels are removed from the small window. This makes the background estimation more accurate, reduces the false-alarm rate, and improves the detection performance. Experimental results on three real hyperspectral datasets such as Airport, Beach, and Urban scenes indicate that the detection accuracy of this method outperforms other commonly used anomaly detection methods. View Full-Text
Keywords: hyperspectral image; anomaly detection; density peak clustering; collaborative representation detector hyperspectral image; anomaly detection; density peak clustering; collaborative representation detector
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Tu, B.; Li, N.; Liao, Z.; Ou, X.; Zhang, G. Hyperspectral Anomaly Detection via Spatial Density Background Purification. Remote Sens. 2019, 11, 2618.

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