基于稀疏表示及光谱信息的高光谱遥感图像分类

摘要

该文结合稀疏表示及光谱信息提出了一种新的高光谱遥感图像分类算法.首先提出利用高光谱遥感图像数据集构造学习字典,然后根据学习字典计算每个像元的稀疏系数,从而获得像元的稀疏表示特征,最后根据稀疏表示特征和光谱信息分别构造随机森林,通过投票机制得到最终的分类结果.在AVIRIS高光谱遥感图像上的实验结果表明:该文所提方法能够提高分类效果,且其分类总精度和Kappa系数要高于光谱信息和稀疏表示特征方法.%This paper presents a novel classification algorithm of hyperspectral remote sensing image based on sparse representation and spectral information. First, a learning dictionary is obtained based on hyperspectral remote sensing image data set, and then the sparse coefficient of each pixel is calculated according to the learning dictionary. As a result, sparse representation feature is obtained. Finally, random forests are respectively constructed based on sparse representation feature and spectral information, and the classification result is decided by voting strategy. Experiments on AVIRIS hyperspectral remote sensing image justify the effectiveness of the algorithm. The experimental results indicate that the proposed method has better performance than methods based on spectral and sparse representation respectively, and has a higher overall accuracy and Kappa coefficient.