image processing problem in Salt and Pepper noise

Question

Mohammad abu aqoulah 2020-6-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/539387-image-processing-problem-in-salt-and-pepper-noise

回答： Image Analyst 2020-6-1

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') 

--------------------------------------------

the proplem shown in pic attached

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Answer 1

Image Analyst 2020-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/539387-image-processing-problem-in-salt-and-pepper-noise#answer_444274

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.

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Answer 2

Sugar Daddy 2020-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/539387-image-processing-problem-in-salt-and-pepper-noise#answer_443991

编辑：Sugar Daddy 2020-6-1

在 MATLAB Online 中打开

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')