噪声鲁棒的高光谱图像波段选择方法
Noise robust band selection method for hyperspectral images
- 2022年26卷第11期 页码：2382-2398
纸质出版日期： 2022-11-07
DOI： 10.11834/jrs.20211128
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摘要
目前大多数高光谱图像波段选择方法仅考虑波段信息冗余问题，忽略了所选波段的噪声水平，致使选取的代表性波段子集中可能含有噪声水平较高的波段。为解决这一问题，本文提出一种噪声鲁棒的高光谱图像波段自适应分区与子空间搜索方法。首先，基于皮尔逊相关系数构造高光谱图像波段相关性矩阵；然后，将高光谱图像光谱波段等分为若干子空间，通过构造与皮尔逊相关系数相适应的子空间划分最优目标函数，自适应地调整子空间的分割点；最后，综合考虑波段的信息熵和噪声水平，在子空间波段选择时将噪声水平以惩罚项的形式反映在优化问题的目标函数中。在Indian Pines、Washington DC和Salinas这3个数据集上进行了实验，采用波段平均相关性、分类精度两种指标对不同方法的波段选择结果进行评价，并分析各种波段选择方法的噪声鲁棒性。实验结果表明，本文方法能够挑选出信息量大且噪声水平低的代表性波段。与其它波段选择方法相比，本文方法所选择的代表性波段平均相关性弱，分类精度高，在包含噪声波段的高光谱图像中效果尤为显著。
Abstract
Most proposed hyperspectral image band selection methods only consider the problem of band information redundancy and ignore the noise level of the selected bands. Accordingly
the representative band subset may contain high-noise bands
which is not conducive to subsequent semantic segmentation
image classification
and other applications. In response to this problem
this work proposes a noise-robust band selection method based on Pearson correlation coefficient
Information Entropy and Noise Level
referred to as PIENL.
In the proposed PIENL method
the Pearson correlation coefficient is first used to calculate the correlation between the bands
and the band correlation matrix is constructed. Then
the spectral bands of the hyperspectral image are divided into several subspaces of the same size
and an optimal subspace division objective function adapted to the Pearson correlation coefficient is constructed to adjust the division points of the subspace. Finally
a new band information measurement criterion is proposed
which observes the band information entropy and noise level at the same time and uses the noise level as a penalty item in the objective function of the optimization problem. According to this criterion
the spectral band with high information entropy and low noise level in each subspace is selected as the representative band.
Experiments were conducted on three public hyperspectral datasets of Indian Pines
Salinas
and Washington DC. Different band selection methods are evaluated using the average correlation degree of bands
classification accuracy
and the noise robustness. The experimental results show that this proposed PIENL method demonstrated outstanding band selection performance in terms of class separability
average correlation of representative bands
and noise robustness compared with the other advanced band selection methods.
The PIENL method has strong robustness to noise and has achieved significant results on hyperspectral datasets containing noise bands. We can conclude that: (1) The similarity measurement method based on the Pearson correlation coefficient is more suitable for measuring the spectral difference between the noisy hyperspectral image bands compared with Euclidean distance; (2) Considering both information entropy and noise level to measure band information is helpful to select representative bands of hyperspectral image; (3) The representative bands selected by PIENL have better class separability. Compared with other advanced band selection methods
the overall accuracy of PIENL method is improved by 3%—13%
1.5%—6.0% and 1%—6% respectively on the three datasets with high-noise bands removed. The overall accuracy is improved by 6%—11%
2%—8% and 3%—7% respectively on the three datasets containing high-noise bands. This also shows that PIENL has better performance on hyperspectral images that contain high-noise bands.
关键词
高光谱波段选择噪声鲁棒子空间划分搜索准则
Keywords
hyperspectralband selectionnoise robustnesssubspace partitionsearch criteria
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哈尔滨工程大学 信息与通信工程学院
大连民族大学 信息与通信工程学院
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地理空间大数据挖掘与应用湖南省重点实验室
中国科学院空天信息创新研究院
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