拉普拉斯算法，对高光谱图像进行降维处理，比较实用，多层分解方法-Laplace algorithm to reduce the dimension of hyperspectral image processing, more practical, multi-layer decomposition method

matlab——多层非负矩阵分解光谱解混代码-Spectral Unmixing of Hyperspectral Imagery Using Multilayer NMF