title: How to use Contours in OpenCV 2.3.1?
body: <p>I recently changed from using the C interface to the C++ interface in OpenCV. In the C interface, there were a variety of things that don't seem to exist in the C++ one. Does anyone know the solution to these problems:</p>
  
  <p>1) In the C interface there was an object called a Contour Scanner. It was used to find contours in an image one by one. How would I do this in C++? Instead of finding all the contours at once, I want to find them one at a time.</p>
  
  <p>2) In C <code>CvSeq</code> was used to represent contours, however in C++ <code>vector &lt;vector&lt;Point&gt; &gt;</code> is used. In C I was able to access the next contour by using <code>h_next</code>. Whats the C++ equivalent of  <code>h_next</code>?</p>