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Mat_<double> A(3,3);  A << -1, 1, 2, -2, 3, 1 , 4, 0, 3;
Mat Sw, mea;
calcCovarMatrix( A, Sw, mea, cv::COVAR_NORMAL|cv::COVAR_ROWS );
cerr << Sw << endl;

[20.66666666666666, -8.333333333333334, 6;
 -8.333333333333334, 4.666666666666667, -3;
 6, -3, 2]

sw  = sw / (A.rows - 1)

hello everyone, i have a question to help, How patting a front face , it can be converted into different angles by calculating the picture , such as up and down about 45 degrees。

Now my storage space is very limited , only 8k size , how can I extract eigenfaces storage in, please help