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?
Prashant Kumar answered .
2025-11-20
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.