title: Face-tracker to find eyes iphone
body: <p>I used <a href="https://github.com/aptogo/FaceTracker">the code from here</a> to find Face. Im trying to draw both the eyes and the face.
  But I can only show both the eyes or the face depending which of the statements i write first. How to do this?</p>
  
  <pre><code>// Detect faces
  std::vector faces;
  _faceCascade.detectMultiScale(mat, faces, 1.1, 2, kHaarOptions, cv::Size(60, 60));
  //Detect eyes
  std::vector eyes;
  _eyesCascade.detectMultiScale(mat, eyes, 1.1, 2, kHaarOptions, cv::Size(30, 30));
  </code></pre>
  
  <p>Here eyes.size() = 0. If i interchange the position of the two statements, i get eyes.size() = 2 and faces.size() = 0</p>