title: minMaxLoc datatype
body: <p>I have been stumped by this for quite some time. could you please help me to know, what datatype does the minMaxLoc() in Opencv consider, while finding the max, min vlaues of a Mat variable? I got a certain value from the function, but I have no idea wat that value actually represents, and in what data type?</p>
  
  <pre><code>    Laplacian(src_gray,dst,ddepth,kernel_size,scale,delta,BORDER_DEFAULT);
      minMaxLoc(dst,&amp;min,&amp;estimate,&amp;minLoc,&amp;maxLoc,noArray());
  </code></pre>
  
  <p>The value of 'estimate' is somewhere around 1000's, while if I try to access the value of 'dst' Mat variable, using </p>
  
  <pre><code>    dst.at&lt;datatype&gt;(k,l)
  </code></pre>
  
  <p>Am getting vague values, starting from 124, 125 for uchar, to 2,xxx,xxx,xxx if I use long int. What is the value actually given by the minMaxLoc function? Please help me.</p>