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Search duplicate images in sub folders using histogram

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from Search duplicate images in sub folders using histogram by Tharindu Adikari
Finds duplicate images in a folder and in sub-folders using a histogram based method.

duplicates 
function duplicates
global db;

for i=1:length(db)
    for j=1:length(db)
        if (corr2(db(i).v,db(j).v)>.99 && i~=j)
            try
            subplot(121);imshow(db(i).path);title(db(i).path);
            subplot(122);imshow(db(j).path);title(db(j).path);
            pause;
            catch ME
            end
        end
    end
end

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