title: How to access vector<vector<Point>> contours in opencv like matrix element?
body: <p>My problem is I do not know how to access <code>vector &lt;vector &lt;Point&gt;&gt;</code> contour (this is 2D like matrix on OpenCV)     </p>
  
  <p>I want to do this. If Mat element does not consists in contours area I want to suppress that matrix elements. In order to do this I need to know contours element too.</p>