Re-extract final images after vectorizing a set of images

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fadams18 2020-3-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/509931-re-extract-final-images-after-vectorizing-a-set-of-images

I have 20 images each of which is 175 x 200. then i create a matrix X and unfold each image into it. so that X becomes a (175*200, 20 ). I applied Non-negative matrix factorization on this X data. and reconstructed it into a X_hat matrix. Now I would like to extract the individual images back.

m=200;
n=175;
N=20;
X= [];
avg= zeros(m*n,1); 
count=0;
for j=1:N
    figure(1)
    ff=['faces/stallone',num2str(j,'%02d'), '.jpg']; % Load images
    u = imread(ff);% read into X
    imshow(u)
    set(gcf, 'Position',[100 100 500 500])
    if (size(u,3)==1)
        M= double(u);
    else
        M= double(rgb2gray(u));
    end
    pause(0.1);
    R= reshape(M,m*n,1); % before (n,m) now (m*n,1)
    X= [X,R]; % stack them into X
    avg =avg +R;
    count=count+1;
end
[ X_hat] = NMF(Q, X_hat,Winit,Hinit); % I applied NMF and obtained X_hat