title: Head pose estimation with Opencv
body: <p>I am using OpenCV Haar Algorithm to track the Head and overlay an image over the Head.<br>
  What I am doing is saving frames generated by camera and overlaying image over each frames.<br>
  And time is not a constraint as I am not doing it Real-Time.  </p>
  
  <p>My code is working fine for say 45 degree of left and right rotation of Head.<br>
  But I need something which will track up to 90 degree of rotation.  </p>
  
  <p>Even I got many reference of OpenCV functions and <a href="http://www.morethantechnical.com/2010/03/19/quick-and-easy-head-pose-estimation-with-opencv-w-code/">link to estimate Head Pose</a></p>
  
  <p>Please provide me some reference. Code Examples will be cool.<br>
  Thanks in advance</p>