title: Emgu CV 3 findContours and hierarchy parameter of type Vec4i equivalent?
body: <p>I'm attempting to translate the following OpenCV C++ code into Emgu CV 3:</p>
  
  <pre><code>std::vector&lt;std::vector&lt;cv::Point&gt; &gt; contours;
  std::vector&lt;cv::Vec4i&gt; v4iHierarchy;
  
  cv::findContours(imgThreshCopy, contours, v4iHierarchy, cv::RETR_TREE, cv::CHAIN_APPROX_SIMPLE);
  </code></pre>
  
  <p>I can find some Emgu CV 3 examples that use null for the 3rd parameter to findContours, for example doing it that way here would be a Visual Basic translation:</p>
  
  <pre><code>Dim contours As New VectorOfVectorOfPoint()
  
  CvInvoke.FindContours(imgThreshCopy, contours, Nothing, RetrType.Tree, ChainApproxMethod.ChainApproxSimple)
  </code></pre>
  
  <p>Which works if the hierarchy parameter is not needed, but what if it is?  I can't seem to figure the Emgu CV 3 syntax equivalent for the C++ line</p>
  
  <pre><code>std::vector&lt;cv::Vec4i&gt; v4iHierarchy;
  </code></pre>
  
  <p>Anybody else gotten this to work?  Any help would be appreciated.</p>