title: How to make images for Haar training
body: <p>How I choose positive images for make my model? What I need change on images? thanks! I dont find a tutorial for follow, and the <a href="http://docs.opencv.org/3.0-beta/doc/user_guide/ug_traincascade.html" rel="nofollow">doc</a> dont help me much.
  Exemple:
  <a href="http://i.stack.imgur.com/auNzQ.jpg" rel="nofollow">Brazil coin</a></p>