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Hyperspectral anomaly detection based on the weakly supervised robust autoencoder |
ZHANG Guojian1( ), LIU Shengzhen2( ), SUN Yingjun1, YU Kaijie3, LIU Lina4 |
1. College of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250101, China 2. First Geodetic Survey Team, Ministry of Natural Resources, Xi’an 710054, China 3. Zhejiang Zhongcexintu Geographic Information Technology Co., Huzhou 313200, China 4. Ningbo Yinzhou District Surveying and Mapping Institute, Ningbo 315041, China |
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Abstract Hyperspectral anomaly detection has received particular attention due to its unsupervised detection of targets. Moreover, autoencoder (AE), together with its variants, can automatically extract deep features and detect anomalous targets. However, AE is highly generalizable due to the existence of anomalies in the training set, thus suffering a reduced ability to distinguish anomalies from the background. This study proposed an anomaly detection algorithm based on the weakly supervised robust AE (WSRAE). First, this study developed a salient category search strategy and used probability-based category thresholds to label coarse samples in order to make preparation for network-based weakly supervised learning. Moreover, this study constructed a robust AE framework constrained jointly by l2,1 norm and anomaly-background spectral distances. This framework was robust with regard to noise and anomalies during training. Finally, this study detected anomalous targets based on the reconstruction errors obtained from all samples. Experiments on four hyperspectral datasets show that the WSRAE algorithm has greater detection performance than other state-of-the-art anomaly detection algorithms.
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Keywords
hyperspectral image
anomaly detection
salient category search
robust AE
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Issue Date: 07 July 2023
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