How do I remove the scattered noise from my Image?

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Guru Charan Das Mudigonda 2019-4-22

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评论： Guru Charan Das Mudigonda 2019-4-22

Hello,

I am trying to remove the round white bodies from my image. I think it is salt and pepper noise. But I have tried applying medfilt2 function with 3X3, 4X4 and 8X8 neighbourhood values yet I have not been able to remove these white spot-like circles. Could anyone please help me how to remove this noise?

Thanks in advance!

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KALYAN ACHARJYA 2019-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/457760-how-do-i-remove-the-scattered-noise-from-my-image#answer_371650

编辑：KALYAN ACHARJYA 2019-4-22

在 MATLAB Online 中打开

You can do that in multiples ways- Use morphological operations (Documentation here)

im=imread('image3.jpeg');
im2=im2bw(im);
figure, imshow(im2);
im3=bwareaopen(im2,60);
%..................^.. Change this value as per your requirements
figure, imshow(im3);

You can also look here bwareafilt

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KALYAN ACHARJYA 2019-4-22

在 MATLAB Online 中打开

- just explain me why the median filter won't work for this type of noise-

Suppose you have gray image

Pixels: 20, 34 ,40,45, 100,110,120,200,255

Center Pixel replace by median: 100

As from the image, the noises & its adjacent boundary also having similar pixel values. It doenot effect iy you choose the smaller window, like 3x3 (most noises-white small dots are much larger than 3x3 pixels). If you choose the window size more than 3x3 (say 15x15), I expect it will works. But its effects on non noise parts also.

see the following example:

im=imread('image3.jpeg');
figure,imshow(im);
im2=medfilt2(im,[15 15]);
figure,imshow(im2);

Lets wait for better clarification from @Image Analyst sir

Guru Charan Das Mudigonda 2019-4-22

Hello,

Thank you for your response. I understand the logic now. I will try the 15X15 neighbourhood. But like you said, I think even the important part of my image that must not be filtered would be blurred with this neighbourhood. Of course, if possible, I would like to know how to use cleaning and removal morphological operations in correct flow to obtain the same result.

Thanks in advance!

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