How to deconvolve an image in MATLAB? i was using weiner filter for this purpose but didn't get the results.

조회 수: 1(최근 30일)
function ex = wienerFilter(y,h,sigma,gamma,alpha);
% ex = wienerFilter(y,h,sigma,gamma,alpha);
% Generalized Wiener filter using parameter alpha. When
% alpha = 1, it is the Wiener filter. It is also called
% Regularized inverse filter.
% Reference: Richb's paper
% Created: Tue May 4 16:24:06 CDT 1999, Huipin Zhang
N = size(y,1);
Yf = fft2(y);
Hf = fft2(h,N,N);
Pyf = abs(Yf).^2/N^2;
% direct implementation of the regularized inverse filter,
% when alpha = 1, it is the Wiener filter
% Gf = conj(Hf).*Pxf./(abs(Hf.^2).*Pxf+alpha*sigma^2);
% Since we don't know Pxf, the following
% handle singular case (zero case)
sHf = Hf.*(abs(Hf)>0)+1/gamma*(abs(Hf)==0);
iHf = 1./sHf;
iHf = iHf.*(abs(Hf)*gamma>1)+gamma*abs(sHf).*iHf.*(abs(sHf)*gamma<=1);
Pyf = Pyf.*(Pyf>sigma^2)+sigma^2*(Pyf<=sigma^2);
Gf = iHf.*(Pyf-sigma^2)./(Pyf-(1-alpha)*sigma^2);
% max(max(abs(Gf).^2)) % should be equal to gamma^2
% Restorated image without denoising
eXf = Gf.*Yf;
ex = real(ifft2(eXf));
  댓글 수: 1
Gab D
Gab D 2020년 8월 6일
Hi, could you provide de full reference of Richb's paper? I am not able to determine what is the gamma variable.
Also, since we dont know Pxf, could we just use an approximation based on a standart Fourier deconvolution X_0hat=Y/H and compute Pxf from there?
Thank you in advance for your help!

댓글을 달려면 로그인하십시오.


Daniel Vieira
Daniel Vieira 2020년 3월 2일
Looking superficially this code seems right, would have to go through the theory to check. But you can also use the function wiener2.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by