/* Principal Components Analysis or the Karhunen-Loeve expansion is a classical method for dimensionality reduction or exploratory data analysis. One reference among many is: F. Murtagh and A. Heck, Multivariate Data Analysis, Kluwer Academi

给出图像处理中应用比较广泛的三种方法：Karhunen－Loeve变换-离散余弦变换-小波变换在图像处理中的比较，供参考-Given the image processing application in a wide range of three methods: Karhunen-Loeve transform- discrete cosine transform- wavelet transform in image processing, comparison and for refer