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Sparse unmixing with truncated weighted nuclear norm for hyperspectral data

  • role： First author第一作者
  • Affiliation：

    Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing, Nanchang Institute of Technology, Nanchang 330099, China

  • Email：lifan@nit.edu.cn
  • Introduction：李璠， 研究方向为高光谱图像解混、机器学习。E-mail： lifan@nit.edu.cn
LI Fan1,  
  • Affiliation：

    Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing, Nanchang Institute of Technology, Nanchang 330099, China

ZHANG Shaoquan1,  
  • Affiliation：

    School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China

CAO Jingjing2,  
  • Affiliation：

    School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China

LIANG Bingkun2,  
  • role： Corresponding author通信作者
  • Affiliation：

    School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China

  • Email：lijun48@mail.sysu.edu.cn
  • Introduction：李军， 研究方向为高光谱分类、混合像元分解、信号处理。E-mail： lijun48@mail.sysu.edu.cn
LI Jun2*,  
  • Affiliation：

    School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China

LIU Kai2,  
  • Affiliation：

    Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing, Nanchang Institute of Technology, Nanchang 330099, China

DENG Chengzhi1,  
  • Affiliation：

    Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing, Nanchang Institute of Technology, Nanchang 330099, China

WANG Shengqian1

resumen

Spectral unmixing is an important technology for quantitative analysis of hyperspectral images, which estimates the pure source signal (endmember) and the corresponding fractional proportion (abundance). Sparse unmixing is one of the research highlights in the field of spectral unmixing. Sparse unmixing finds a set of endmembers that can optimally model mixed pixels from a known spectral library and takes the fractional abundance as the weight, thereby circumventing the process of endmember extraction. However, hyperspectral data are often contaminated by noise due to the limitations of instruments and observation conditions. This state is disadvantageous to data interpretation. Sparse unmixing is peculiarly prone to be disturbed by noise and thus affect the accuracy of abundance estimation or even erroneously identify endmembers from spectral libraries.To overcome this drawback, this study proposes a hyperspectral sparse unmixing method with truncated weighted nuclear norm, which exploits the correlation of pixels to reduce the interference of noise on abundance estimation. The proposed method adds the low-rank constraint based on truncated weighted nuclear norms to the sparse unmixing model given that low-rank representation is available to mine the inherent low-dimensional structure of data. It is different from other nuclear norm minimization, singular values are divided into two groups and treated with the truncated nuclear norm and weighted kernel norm. It provides a better low-rank approximation of the abundance matrix, which maintains the spatial consistency of image and protects the detailed information. Inspired by the weighted sparse strategy, the spatial neighborhood weight is introduced into the sparse regularization term, which enhances the spatial continuity of image. The underlying optimization problem is solved by the alternating direction method of multipliers efficiently.Experiments are conducted on simulated data, real Cuprite, and mangrove hyperspectral data to verify the unmixing performance of the algorithm. In particular, there is no available spectral library for mangrove hyperspectral data, which is essential for the sparse unmixing algorithm, so a spectral library is built derived from the original data. The various vegetation curves in the library are relatively close, which brings challenges to the unmixing task. Even so, the proposed method identified all mangrove species, and achieved approximately consistent results with the reference classification map. Compared with other advanced sparse unmixing methods, the proposed method is superior in restraining the influence of noise and can obtain high unmixing accuracy even in the case of high noise.In future work, we will further explore the spatial information of hyperspectral images with tensor-based low-rank representation to improve the robustness of the sparse unmixing algorithm. In addition, we will collect hyperspectral data with more mangrove species and expand the corresponding spectral library, further develop mangrove species classification techniques based on spectral unmixing to better serve the investigation of mangrove species composition.

palabra clave

remote sensing;hyperspectral data;sparse unmixing;low-rank regularization;truncated weighted nuclear norm;spatial weight

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