摘要
在无需先验标签样本的情况下,非监督降维可以有效简化高光谱图像的特征空间,避免目标分类中的霍夫效应。本文提出JM非线性变换优化的自适应降维模型来研究面向图像目标分类的高光谱波段选择问题。该方法考虑波段的信息量和独立性等两个重要因子,针对其测度方法的差异性问题,引入JM变换函数进行规范化优化。选用线阵高光谱和面阵显微光谱等两个图像数据集,在k最邻近和随机森林分类器下,进行了多组监督分类实验,结果表明,在Kappa系数、总体分类精度和平均分类精度上,本文方法均优于3种非监督方法MABS、InfFS和LSFS。说明本文提出的JM变换的自适应降维模型能够有效降低特征维度,满足高光谱图像分类的高精度要求。
Hyperspectral remote sensing images,which collect rich spectral and spatial information of observed targets,usually contain dozens to hundreds of narrow bands with wavelengths ranging from the visible light region to the near-infrared spectra.With such an abundant number of spectral features,hyperspectral images(HSI)allow us to distinguish different of objects or targets by rule and line.Unfortunately,such high-dimensionality data pose a challenge in data transmission,storage,and processing.Specifically,those HSIs with high redundancy information and strong correlation are prone to a Hughes phenomenon during the image classification process.Therefore,dimensionality reduction is necessary for targets classification.Moreover,without using prior label samples,unsupervised dimensionality reduction can effectively simplify the HSI feature space,and prevent the Hughes phenomenon in the targets classification.In this paper,the Jeffries–Matusita(JM)modified adaptive band selection(JM2 ABS)method is proposed to extract proper features from HSI datasets.Generally speaking,a band that contains many information and demonstrates strong independence is a very important feature that helps unsupervised band selection methods to classify targets.The JM2 ABS method considers both the information capacity and independence of HSI bands.Given the significant differences in the measurements of a band’s information capacity and its independence,we introduce the JM transform function to normalize the distributions of the information capacity and the independence of HSI data.Thus JM2 ABS shows that both the information capacity and the independence are equally important in unsupervised dimensionality reduction.We also compare our proposed JM2 ABS method against three typical methods,namely,the modified adaptive band selection method,the Laplacian score feature selection method,and the infinite feature selection method.By using random training samples,we perform supervised classification experiments on two kinds of HSI public datasets
作者
康孝岩
张爱武
胡少兴
肖青
柴沙驼
KANG Xiaoyan;ZHANG Aiwu;HU Shaoxing;XIAO Qing;CHAI Shatuo(Key Laboratory of 3D Information Acquisition and Application,Ministry of Education,Capital Normal University,Beijing 100048,China;Engineering Research Center of Spatial Information Technology,Ministry of Education,Capital Normal University,Beijing 100048,China;School of Mechanical Engineering&Automation,Beihang University,Beijing 100191,China;State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100101,China;Academy of Animal and Veterinary Sciences,Qinghai University,Xining,810016,China)
出处
《遥感学报》
EI
CSCD
北大核心
2020年第1期67-75,共9页
NATIONAL REMOTE SENSING BULLETIN
基金
国家自然科学基金(编号:41571369)
国家重点研发计划(编号:2016YFB0502500)
北京市自然科学基金(编号:4162034)
青海省科技计划(编号:2016-NK-138).
关键词
遥感
JM变换
规范化
自适应降维
非监督波段选择
高光谱图像
remote sensing
Jeffries-Matusita transform
normalization
adaptive dimensionality reduction
unsupervised band selection
hyperspectral image
