title: What kind of noise is present in this image and how do I remove it?
body: <p>My task was to deblur a image. I used Weiner Filter and got this kind of image. Is it possible to improve it further?</p>
  
  <p><img src="https://i.stack.imgur.com/FnrKk.png" alt="Deblurred Image"></p>
  
  <p>Here is my code:</p>
  
  <pre><code>I = im2double(imread('Demo4_b.jpg'));
  imshow(I);
  title('Original Image');
  
  LEN = 21;
  THETA = 11;
  PSF = fspecial('motion', LEN, THETA);
  
  estimated_nsr = 0;
  wnr2 = deconvwnr(I, PSF, estimated_nsr);
  figure, imshow(wnr2)
  title('Restoration of Blurred, Noisy Image Using NSR = 0')
  
  estimated_nsr = noise_var / var(I(:));
  wnr3 = deconvwnr(I, PSF, estimated_nsr);
  figure, imshow(wnr3)
  title('Restoration of Blurred, Noisy Image Using Estimated NSR');
  </code></pre>
  
  <p>I am getting same output in both with NSR and without NSR cases. Here is my original image:
  <img src="https://i.stack.imgur.com/eJw5z.jpg" alt="Original Image"></p>