Global spatial and local spectral similarity-based manifold learning group sparse representation for hyperspectral imagery classification

Haoyang Yu, Lianru Gao, Wenzhi Liao, Bing Zhang, Lina Zhuang, Meiping Song, Jocelyn Chanussot

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Spectral-spatial framework has been widely applied for hyperspectral image classification task. Some well-established models, such as group sparse representation (GSR), have gained a certain advance but still mainly focus on the usage of local spatial similarity and neglect the nonlocal spatial information. Recently, nonlocal self-similarity (NLSS) has been exploited to support the spatial coherence tasks. However, current NLSS-based methods are biased toward the direct use of nonlocal spatial information as a whole, while the underlying spectral information is not well exploited. In this article, we proposed a novel method to exploit local spectral similarity through nonlocal spatial similarity, with the integration of local spatial consistency in a single framework. Specifically, the proposed approach first exploits the NLSS by searching the nonoverlapped similar patches in defined scopes. Then, spectral similarity is determined locally within the found patches. After that, the found similar data and the original data are fused in a designed pattern. Finally, the GSR-based classifier (GSRC) is applied to process the fused data characterized by the manifold learning algorithm. The experimental results based on three real hyperspectral data sets demonstrate the efficiency of the proposed method, with improvements over the other related nonlocal or local similarity-based methods.
Original languageEnglish
Pages (from-to)3043-3056
Number of pages14
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume58
Issue number5
Early online date1 Nov 2019
DOIs
Publication statusPublished - 31 May 2020

Keywords

  • classification
  • group sparse representation (GSR)
  • hyperspectral image
  • nonlocal self-similarity (NLSS)

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