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An initialization method of non-negative matrix factorization for hyperspectral data unmixing based on spectral shape and information dissimilarity |
| YUAN Deyou1, YUAN Lin2 |
1. School of Mathematics dissimilarity and Statistics, Nanyang Institute of Technology, Nanyang 473004, China;
2. School of Economics and Management, Nanyang Institute of Technology, Nanyang 473004, China |
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Abstract When blind signal separation technique is applied to unmixing hyperspectral data, a good initialization is vital for improving separating precision. Aimed at the hyperspectral data with relatively high spatial resolution and simple surface features, the authors put forward a reasonable hypothesis that the data contain pure pixel or approximate pure pixel corresponding to the each type of end-members, and proposed a new initialization method of non-negative matrix factorization(NMF), which has great potential in pixel unmixing. By calculating parameters to quantify the spectral shape and information difference among candidate pixels, this method extracts pure pixels from mixed pixels, recognizes the information dissimilarity among different types of pure pixels and choose the existing pixels that are most suitable for representing each type of end-members as NMF’s initial values. The experimental results show that the method proposed in this paper can improve NMF’s decomposition accuracy of hyperspectral data significantly, and its performance is better than that of other NMF initialization methods.
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| Keywords
Dianchi watershed
water erosion desertification
remote sensing
dynamic monitoring
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Issue Date: 04 December 2017
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2017,
Vol. 29
