image processing problem in Salt and Pepper noise

i try to add Salt and Pepper noise after that try to use median filter to denoise it in this code but has a problem

code ;

I = imread('PicQ1.png');
figure ,imshow(I)
J = imnoise(I,'salt & pepper',0.05);
figure ,imshow(J)
 M = medfilt2(J);
imshowpair(J,M,'montage') 

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the proplem shown in pic attached

Answer 1

[Image Analyst]

A better method is to use a modified median filter where you only replace the noise pixels with the median, not ALL pixels. This will prevent blurring and shape changing.

Answer 2

[Sugar Daddy]

You are feeding a coloured image which is three dimensional ( RGB) while medfilt2 needs 2D data.

For example

I = imread('cameraman.tif');%default image
figure ,imshow(I);
J = imnoise(I,'salt & pepper',0.05);

 M = medfilt2(J);% Now this will work because I is a gray scaled image
imshowpair(J,M,'montage')

Either change your rgb image to grayscale or apply medfilt2 on all three colours sequentialy

see the answer of image analyst below about how to apply median filter on coloured image

https://www.mathworks.com/matlabcentral/answers/123700-how-to-apply-median-filter-to-a-color-image

[Mohammad abu aqoulah]

i try this code and work

clc

clear all

close all

I = imread('PicQ3.jpg');

subplot(2,2,1); imshow(I),title ('Original image')

J = imnoise(I,'salt & pepper',0.05);

subplot(2,2,2);imshow(J), title('Salt and Pepper" noise')

for (i=1:3)

M(:,:,i) = medfilt2(J(:,:,i),[3,3]);

end

subplot(2,2,3);imshow(M),title('after filtering')

[Sugar Daddy]

If your issue is resolved please accept the answer