How to remove this noise?

Hello, I have to use "liftingbody.png" and then, use this mask:

img=imread('liftingbody.png');

img=double(img)/255;

mask=[1 1 1; 1 5 1; 1 1 1]/13;

filtered=imfilter(img,mask);

and add gaussian noise:

noise=imnoise(filtered, 'gaussian');

then, I have to completely remove noise. I've used wiener2 and medfilt, and also imfilter with various masks, but I can't remove it completely. Are there any rules about what certain filter you have to use to remove this particular noise? I have also different exercises with different noises, eg. salt&pepper or speckle, and I always have problems with removing them, I do it quite blindly. Any help please? Are there any rules?

Answer 1

[Image Analyst]

Without knowing the original image, if you could completely remove noise, you'd have an extraordinarily valuable patent! There are tons of noise removal methods for several different kinds of noise - none perfect. Keep trying different methods until the denoised image is good enough to do whatever you need to do with it after it's been denoised.