I = imread('eight.tif');
J = imnoise(I,'salt & pepper', 0.05);%5%噪声
figure, imshow(I), figure, imshow(J)
又:
I = imread('eight.tif');
J = imnoise(I,''gaussian',1,0.05);%1是均值,0.05是方差
figure, imshow(I), figure, imshow(J)
又:x+0.05*randn是在x上加入随机噪声,0.05是把噪声值变小
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