title: Geometric mean filter for denoising image in MATLAB
body: <p>I am new to MATLAB. I don't know how to use geometric mean filter for filtering noisy image. For arithmetic mean filter I use this:</p>
  
  <pre><code>H = fspecial('average',5);
  a = imfilter(a, H);
  </code></pre>
  
  <p>Is there any similar way for geometric mean filter?</p>