Nathaniel asked . 2020-10-15

How to remove gaussian noise?

Hello, I'm working on image encryption. I need to see how well my encryption is so i thght of adding noise and testing it.I added gaussian noise with the following code.My problem is i dont know how to remove it before applying decryption algorithm.i get decimal values, I want to get whole numbers in the resulting matrix.

   I=imread('leena.bmp');
   M =0;
   V=0.01;
   imshow(I);
   title('Original Image');
   J = imnoise(I,'gaussian',M,V);
   ?gure,imshow(J);
   title('Gaussian Noise');

i'm planning to add other noises as well like poisson noise, speckle noise and salt and pepper noise. Is there any possibility that a code exists for removing all these noises separately?

matlab , image processing, matrix , gaussian noise

Expert Answer

Prashant Kumar answered . 2024-12-22 03:57:00

For Gaussian noise, the maximum likelihood de-noised answer would just be a local mean, which you can do with conv2():

denoisedImage = conv2(double(noisyImage), ones(3)/9, 'same');,

If you want to do Salt and Pepper noise, then see my attached demos where I use a modified median filter.

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