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Open AccessArticle

A Lightweight Spectral–Spatial Feature Extraction and Fusion Network for Hyperspectral Image Classification

by Linlin Chen 1,2, Zhihui Wei 1,* and Yang Xu 1
1
School of Computer Science and Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
2
Zijin College, Nanjing University of Science & Technology, Nanjing 210023, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(9), 1395; https://doi.org/10.3390/rs12091395
Received: 1 April 2020 / Revised: 18 April 2020 / Accepted: 24 April 2020 / Published: 28 April 2020
(This article belongs to the Special Issue Feature Extraction and Data Classification in Hyperspectral Imaging)
Hyperspectral image (HSI) classification accuracy has been greatly improved by employing deep learning. The current research mainly focuses on how to build a deep network to improve the accuracy. However, these networks tend to be more complex and have more parameters, which makes the model difficult to train and easy to overfit. Therefore, we present a lightweight deep convolutional neural network (CNN) model called S2FEF-CNN. In this model, three S2FEF blocks are used for the joint spectral–spatial features extraction. Each S2FEF block uses 1D spectral convolution to extract spectral features and 2D spatial convolution to extract spatial features, respectively, and then fuses spectral and spatial features by multiplication. Instead of using the full connected layer, two pooling layers follow three blocks for dimension reduction, which further reduces the training parameters. We compared our method with some state-of-the-art HSI classification methods based on deep network on three commonly used hyperspectral datasets. The results show that our network can achieve a comparable classification accuracy with significantly reduced parameters compared to the above deep networks, which reflects its potential advantages in HSI classification. View Full-Text
Keywords: hyperspectral image classification; spectral–spatial feature extraction and fusion; deep learning; convolutional neural network hyperspectral image classification; spectral–spatial feature extraction and fusion; deep learning; convolutional neural network
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MDPI and ACS Style

Chen, L.; Wei, Z.; Xu, Y. A Lightweight Spectral–Spatial Feature Extraction and Fusion Network for Hyperspectral Image Classification. Remote Sens. 2020, 12, 1395.

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