title: Undefined operator '*' for input arguments of type 'struct'
body: <p>MATLAB :
  vso' is graph based visual saliency map (gbvs) of original image, and 'vsd' is graph based visual saliency map (gbvs) of blurred version of the same image.   </p>
  
  <pre><code>          vso=gbvs('../images/I03.bmp'); 
            vsd=gbvs('../images/i03_17_5.bmp'); 
  </code></pre>
  
  <p>Trying to find out similarity map between these both image as -</p>
  
  <pre><code>          Svs=(2*vso*vsd+cvs)/(vso^2+vsd^2+cvs); 
  </code></pre>
  
  <p>where cvs is constant, cvs =1.27   </p>
  
  <p>Error is : <strong>Undefined operator '*' for input arguments of type 'struct'</strong></p>