期刊名称: |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
全部作者: |
Sen Jia,Zhen Ji,Yuntao Qian,Linlin Shen |
出版年份: |
2012 |
卷 号: |
5 |
期 号: |
2 |
页 码: |
531-543 |
查看全本: |
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—The rich information available in hyperspectral
imagery has provided significant opportunities for material classification
and identification. Due to the problem of the “curse
of dimensionality” (called Hughes phenomenon) posed by the
high number of spectral channels along with small amounts of
labeled training samples, dimensionality reduction is a necessary
preprocessing step for hyperspectral data. Generally, in order
to improve the classification accuracy, noise bands generated
by various sources (primarily the sensor and the atmosphere)
are often manually removed in advance. However, the removal
of these bands may discard some important discriminative information,
eventually degrading the classification accuracy. In
this paper, we propose a new strategy to automatically select
bands without manual band removal. Firstly, wavelet shrinkage
is applied to denoise the spatial images of the whole data cube.
Then affinity propagation, which is a recently proposed feature
selection approach, is used to choose representative bands from
the noise-reduced data. Experimental results on three real hyperspectral
data collected by two different sensors demonstrate that
the bands selected by our approach on the whole data (containing
noise bands) could achieve higher overall classification accuracies
than those by other state-of-the-art feature selection techniques on
the manual-band-removal (MBR) data, even better than the bands
identified by the proposed approach on the MBR data, indicating
that the removed “noise” bands are valuable for hyperspectral
classification, which should not be eliminated.