Can I use median filtering without put the salt & pepper noise?

%median filtering

handmf = imread ('ifa.jpg');

handmedfilt = imnoise (handmf,'salt & pepper', 0.02);

handdahmf = medfilt3 (handmedfilt);

imwrite(handmedfilt, 'ifas&p.jpg')

imwrite(handdahmf, 'ifamedifilt.jpg')

Answer 1

[yanqi liu]

yes，sir，may be use it directly，such as

%median filtering
handmf = imread ('cameraman.tif');
%handmedfilt = imnoise (handmf,'salt & pepper', 0.02);
handdahmf = medfilt2 (handmf);
%imwrite(handmedfilt, 'ifas&p.jpg')
%imwrite(handdahmf, 'ifamedifilt.jpg')
figure;
subplot(1,2,1);imshow(handmf);
subplot(1,2,2);imshow(handdahmf);

Answer 2

[Image Analyst]

Not sure what "Can I use median filtering without put the salt & pepper noise?" means, but yes, you can use medfilt2() on an image without first applying noise to the image beforehand.