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ABSTRACT
Longwave infrared hyperspectral images (LWIR-HSIs) classification is challenging, due to the poor imaging quality and low signal-to-noise ratio. A popular viewpoint is that abundant spatial contextual information can significantly improve the classification accuracies. However, it is quite difficult to determine what degree of spatial information is the most useful. In this article, we develop a novel ensemble-based classification method, which is able to fully leverage joint spectral-spatial features in different degrees. The proposed method contains three primary steps. First, a powerful edge-preserving filtering (EPF) approach, rolling guidance filtering (RGF), is utilized to generate several groups of diverse samples as well as enhance the quality of the LWIR-HSI data. Each group corresponds to a certain degree of spatial information. Subsequently, a series of individual classifiers are learned based on all groups of training samples, and each classifier could provide a single classification result for all test samples. Finally, we propose a new ensemble strategy, multi-classifier -statistic (MKS), to evaluate the contributions of individual learners (ILs). The final classification results are obtained based on the outputs of RGF and MKS. Experiments on a challenging LWIR-HSI data set verify the effectiveness of the proposed method, compared with some state-of-the-art HSI classification methods.
Acknowledgement
This work was supported by the National Natural Science Foundation of China under Grant 61671037, the Beijing Natural Science Foundation under Grant 4152031, the funding project of State Key Laboratory of Virtual Reality Technology and Systems, Beihang University under Grant BUAA-VR-16ZZ-03, and the Fundamental Research Funds for the Central Universities under Grant YWF-16-BJ-J-30.
The authors thank Telops Inc. (Québec, Canada) for acquiring and providing the data used in this study, the IEEE GRSS Image Analysis and Data Fusion Technical Committee and Dr Michal Shimoni (Signal and Image Centre, Royal Military Academy, Belgium) for organizing the 2014 Data Fusion Contest, the Centre de Recherche Public Gabriel Lippmann (CRPGL, Luxembourg), Dr Martin Schlerf (CRPGL) for the contribution of the Hyper-Cam LWIR sensor, and Dr Michaela De Martino (University of Genoa, Italy) for her contribution to data preparation.