How do i use pca on image?

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farahnaz
farahnaz 2014-3-22
评论： Image Analyst 2014-3-22
is this code correct? ...................................................
function [signals,PC,V] = pca() I=imread('G:\Users\farahnaz\Downloads\018.jpg'); b= im2double(I); imshow(b, []); [irow, icol] = size(b); data = reshape(b',irow*icol,1);
[M,N] = size(data);
mn = mean(data,2);
data = data - repmat(mn,1,N);
covariance = cov(data)';
[PC, V] = eig(covariance);
V = diag(V);
[junk, rindices] = sort(-1*V);
V = V(rindices); PC = PC(:,rindices);

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