I=imread('cameraman.tif');
[M N]=size(I);%求出圖片大小
y=zeros(1,256)
x=0:255;
for t=0:255
    for i=1:M
        for j=1:N
            if I(i,j)==t
                y(1,t+1)=y(1,t+1)+1;
            end
        end
    end
end
%畫圖
plot(x,y)

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