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Robust unsupervised small area change detection from SAR imagery using deep learning

Zhang, Xinzheng; Su, Hang; Zhang, Ce; Gu, Xiaowei; Tan, Xiaoheng; Atkinson, Peter M.. 2021 Robust unsupervised small area change detection from SAR imagery using deep learning. ISPRS Journal of Photogrammetry and Remote Sensing, 173. 79-94. https://doi.org/10.1016/j.isprsjprs.2021.01.004

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Abstract/Summary

Small area change detection using synthetic aperture radar (SAR) imagery is a highly challenging task, due to speckle noise and imbalance between classes (changed and unchanged). In this paper, a robust unsupervised approach is proposed for small area change detection using deep learning techniques. First, a multi-scale superpixel reconstruction method is developed to generate a difference image (DI), which can suppress the speckle noise effectively and enhance edges by exploiting local, spatially homogeneous information. Second, a two-stage centre-constrained fuzzy c-means clustering algorithm is proposed to divide the pixels of the DI into changed, unchanged and intermediate classes with a parallel clustering strategy. Image patches belonging to the first two classes are then constructed as pseudo-label training samples, and image patches of the intermediate class are treated as testing samples. Finally, a convolutional wavelet neural network (CWNN) is designed and trained to classify testing samples into changed or unchanged classes, coupled with a deep convolutional generative adversarial network (DCGAN) to increase the number of changed class within the pseudo-label training samples. Numerical experiments on four real SAR datasets demonstrate the validity and robustness of the proposed approach, achieving up to 99.61% accuracy for small area change detection.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.isprsjprs.2021.01.004
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
ISSN: 0924-2716
Additional Keywords: change detection, synthetic aperture radar, difference image, fuzzy c-means algorithm, deep learning
NORA Subject Terms: Electronics, Engineering and Technology
Data and Information
Date made live: 19 Feb 2021 12:23 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/529686

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