摘要:
传统的流形学习算法假设不同类的数据位于同一个流形结构上,然而由于不同类别数据的特征不同,其位于各自不同的流形结构上的假设更加合理,因此,多流形假设更适合数据分类问题.通过借鉴多流形谱聚类算法中的多流形思想,研究多流形LE算法及其在高光谱数据降维和分类上的应用,结合高光谱数据特点,通过添加空间信息和数据标记信息进一步改进多流形LE算法.实验结果表明,在多种高光谱数据中,多流形LE算法能取得比LE算法更高的分类精度,同时改进的多流形LE算法也取得比LE和多流形LE算法更高的分类精度,这说明多流形假设更符合高光谱数据的特点,也说明了改进算法的有效性.
Abstract:
The traditional manifold learning algorithms are based on the assumption that categories of data are located in the same manifold structure;nevertheless,due to the different features of different data categories,it is more reasonable that the data are in respective different manifold structures. Hence, the assumption of multi -manifold is more applicable for data classification. This paper adopts the thought of multi - manifold spectral clustering algorithm, mainly focuses on multiple manifolds LE algorithm, and applies this algorithm to the processing of hyperspectral data. Combined with the features of the hyperspectral data, the multiple manifolds LE algorithm is further improved by adding the spatial information and data maker information. The experimental results show that,in many kinds of hyperspectral data,the multi-manifold LE algorithm has higher precision than the LE algorithm. In addition,the improved multi-manifold LE algorithm could classify data with higher precision than the LE algorithm and multi - manifold LE algorithm. The authors have reached the conclusion that the assumption of multi -manifold is in better agreement with the features of hyperspectral data and the improved algorithm is of high performance.