The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B2-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2020, 1281–1287, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1281-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2020, 1281–1287, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1281-2020

  14 Aug 2020

14 Aug 2020

NOISE-TOLERANT HYPERSPECTRAL IMAGE CLASSIFICATION USING DISCRETE COSINE TRANSFORM AND CONVOLUTIONAL NEURAL NETWORKS

A. Voulodimos1, K. Fokeas2, N. Doulamis3, A. Doulamis3, and K. Makantasis4 A. Voulodimos et al.
  • 1Department of Informatics and Computer Engineering, University of West Attica, Athens 12243, Greece
  • 2Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zurich, Switzerland
  • 3School of Rural and Surveying Engineering, National Technical University of Athens, Athens 15773, Greece
  • 4Institute of Digital Games, University of Malta, Msida, Malta

Keywords: Hyperspectral image classification, robustness to noise, Convolutional Neural Networks, Discrete Cosine Transform, noise tolerance, deep learning

Abstract. Hyperspectral image classification has drawn significant attention in the recent years driven by the increasing abundance of sensor-generated hyper- and multi-spectral data, combined with the rapid advancements in the field of machine learning. A vast range of techniques, especially involving deep learning models, have been proposed attaining high levels of classification accuracy. However, many of these approaches significantly deteriorate in performance in the presence of noise in the hyperspectral data. In this paper, we propose a new model that effectively addresses the challenge of noise residing in hyperspectral images. The proposed model, which will be called DCT-CNN, combines the representational power of Convolutional Neural Networks with the noise elimination capabilities introduced by frequency-domain filtering enabled through the Discrete Cosine Transform. In particular, the proposed method entails the transformation of pixel macroblocks to the frequency domain and the discarding of information that corresponds to the higher frequencies in every patch, in which pixel information of abrupt changes and noise often resides. Experiment results in Indian Pines, Salinas and Pavia University datasets indicate that the proposed DCT-CNN constitutes a promising new model for accurate hyperspectral image classification offering robustness to different types of noise, such as Gaussian and salt and pepper noise.