DocumentCode :
1521707
Title :
Spectral Unmixing Cluster Validity Index for Multiple Sets of Endmembers
Author :
Anderson, Derek T. ; Zare, Alina
Author_Institution :
Dept. of Electr. & Comput. Eng., Mississippi State Univ., Starkville, ME, USA
Volume :
5
Issue :
4
fYear :
2012
Firstpage :
1282
Lastpage :
1295
Abstract :
A hyperspectral pixel is generally composed of a relatively small number of endmembers. Several unmixing methods have been developed to enforce this concept through sparsity promotion or piece-wise convex mixing models. Piece-wise convex unmixing methods often require as parameters the number of endmembers and the number of sets of endmembers needed. However, these values are often unknown in advance and difficult to estimate. In this article, a new cluster validity index for multiple sets of endmembers is developed. The proposed index is used to evaluate spectral unmixing results and identify optimal parameter sets for piece-wise convex unmixing methods. No other conventional cluster validity index is directly applicable or theoretically well-suited for the piece-wise convex model. Specifically, we focus on addressing cases in which endmembers may or may not be located in a dense region of the data. Additionally, we focus on cases in which hyperspectral data is well distributed within a convex cluster (not exhibiting significant holes or gaps). The proposed validity index is applied to both simulated and real hyperspectral data. Results show that the proposed method consistently selects the best parameter set.
Keywords :
geophysical image processing; endmembers; hyperspectral pixel; piece wise convex mixing model; sparsity promotion; spectral unmixing cluster validity index; Agriculture; Clustering algorithms; Data models; Hyperspectral imaging; Indexes; Partitioning algorithms; Prototypes; Cluster validity; endmember; hyperspectral; piece-wise convex; spectral variation; unmixing;
fLanguage :
English
Journal_Title :
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of
Publisher :
ieee
ISSN :
1939-1404
Type :
jour
DOI :
10.1109/JSTARS.2012.2189556
Filename :
6203616
Link To Document :
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