spherex.m

来自「利用ICA变换进行人脸检测,是一种新的人脸检测方法」· M 代码 · 共 12 行

% SPHEREX - spheres the training vector x.
%    Requires x, P, to be predefined, and defines mx, c, wz.

fprintf('\nsubtracting mean\n');
mx=mean(x');
x=x-(ones(P,1)*mx)';
fprintf('calculating whitening filter\n');
c=cov(x');
wz=2*inv(sqrtm(c));
fprintf('whitening\n');
x=wz*x;