pca_img_compress.m

matlab 用PCA方法对图像进行压缩、还原

img=imread('sample.jpg');
%imshow(img);
img=rgb2gray(img);
n=min(size(img));
img=double(img(1:n, 1:n));
[u s v]=svd(img);
s=diag(s);
s(200:n)=0;
img=uint8(u*diag(s)*v');
imshow(img);