access icon free Hyperspectral image clustering via sparse dictionary-based anchored regression

Clustering for hyperspectral images (HSIs) is a very challenging task because HSIs usually have large spectral variability, high dimensionality, and complex structures. The main issue of this study is to develop an improved sparse subspace clustering (SSC) method for HSIs. As an extension of spectral clustering, SSC algorithm has achieved great success; however, the direct self-representation dictionary which is created by raw samples has poor representation power and also the widely used dictionary learning (DL) such as K-Singular Value Decomposition (K-SVD) faces with the problems of high computational complexity. In this study, the authors propose a novel HSI clustering method based on sparse DL and anchored regression. The proposed method follows three stages: (i) sparse DL; (ii) anchored subspace construction and regression; and (iii) representation-based spectral clustering. Specifically, we adopt a fast sparse DL method under a double sparsity constrained optimising model to capture the intrinsic HSIs. To establish a compact subspace for collaborative representation, we present an anchored subspace construction method by using atoms clustering and grouping methods. Owing to the anchored subspace, we can fast compute the representation coefficients with a predefined projection matrix. Experimental results demonstrate that the proposed method achieves the best performance for the HSIs clustering.

Inspec keywords: image representation; hyperspectral imaging; learning (artificial intelligence); pattern clustering; optimisation; matrix algebra

Other keywords: hyperspectral data sets; collaborative representation; nature images; compact subspace; anchored subspace construction method; spectral variability; representation-based spectral clustering; improved sparse subspace clustering method; HSIs clustering task; high dimensionality; SSC algorithm; fast sparse DL method; sparse dictionary-based anchored regression; intrinsic hyperspectral signatures; low-dimensional data; poor representation power; direct self-representation dictionary; high computational complexity; complex structures; hyperspectral images

Subjects: Knowledge engineering techniques; Optimisation techniques; Data handling techniques; Optimisation techniques; Algebra; Algebra; Computer vision and image processing techniques; Optical, image and video signal processing

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-ipr.2018.5421
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