Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

I am trying to remove gaussian noise from a 256*256 gray image using 
FIR hamming window.

I created a 2D window and then convolved with the image.
I dont seem to get the desired result.

Here's my code: 

hamm1=hamming(32);
len=length(hamm1);
for i=1:len,
    for j=1:len,
        hamm2(j,i)=hamm1(j,1);
    end
end
hamm2d=hamm2.*hamm2';
hamm_max=max(max(hamm2));
norm_hamm2=hamm2d/hamm_max;
K=conv2(norm_hamm2,noisy_image);

Can someone tell me what is wrong with this and how to correct it?

Any help will be highly appreciated.

Thanks.

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