title: How OpenCV C++ Interface Manage ROI
body: <p>Using OpenCV C++ interface how can I write code for setting and resetting ROI
  For eg: If I need to code like</p>
  
  <pre><code>-&gt; Load image
  -&gt; SetImageRoi
  -&gt; Do some processing on ROI region
  -&gt; Reset ROI
  -&gt; Do some operation on entire image 
  </code></pre>
  
  <p>In this case how can I manage with c++ interface ?</p>
  
  <p>Thanks in advance....</p>