pca人脸识别python实现_如何使用matplotlib中的PCA类进行人脸识别？

我正在尝试使用python构建一个用于人脸识别的代码。现在我可以将所有数据库图像放入一个二维数组中&＃xff0c;以便对它们应用主成分分析(PCA)。我在matplotlib中找到了一个名为PCA的类&＃xff0c;但是我想知道如何使用它来进行人脸识别。在

以下是所述类别的说明&＃xff1a;class matplotlib.mlab.PCA(a)

compute the SVD of a and store data for PCA. Use project to project the data onto a reduced set of dimensions

Inputs:

a: a numobservations x numdims array

Attrs:

a a centered unit sigma version of input a

numrows, numcols: the dimensions of a

mu : a numdims array of means of a

sigma : a numdims array of atandard deviation of a

fracs : the proportion of variance of each of the principal components

Wt : the weight vector for projecting a numdims point or array into PCA space

Y : a projected into PCA space

The factor loadings are in the Wt factor, ie the factor loadings for the 1st principal component are given by Wt[0]