Classification of PolSAR Images Based on Adaptive Nonlocal Stacked Sparse Autoencoder

Yuanyuan Hu, Jianchao Fan, Jun Wang

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Land cover classification using polarimetric synthetic aperture radar (PolSAR) images is an important tool for remote sensing analysis. In view that PolSAR image effective interpretation is commonly affected by the absence of discriminative features and the presence of speckle noises, this letter proposes an adaptive nonlocal stacked sparse autoencoder (ANSSAE) to achieve PolSAR image classification. It extracts the adaptive nonlocal spatial information by adaptively calculating weighted average values of each pixel from nonlocal regions, which can reduce the influence of speckle noises and retain edge details. In the first layer of the ANSSAE, the adaptive nonlocal spatial information is introduced into the objective function to obtain the robust feature representation, whose effects would transfer to the rest of layers. Therefore, the ANSSAE can automatically capture spatial-related, robust, and distinguishable features, which can suppress speckle noises and gain accurate classification results. Experimental results on two real PolSAR images demonstrate that the proposed approach can significantly improve the classification accuracy.

Original languageEnglish
Pages (from-to)1050-1054
Number of pages5
JournalIEEE Geoscience and Remote Sensing Letters
Volume15
Issue number7
DOIs
Publication statusPublished - Jul 2018
Externally publishedYes

Keywords

  • Adaptive nonlocal spatial information
  • polarimetric synthetic aperture radar (PolSAR) image classification
  • stacked sparse autoencoder

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