title: detect face aspect ratio
body: <p>I am working on a demo in ios where a user takes a photograph from camera or from photo gallery, and then some how determine whether the person is japenese, chinese, asian from the skin color, and shape of eyes. Is there any ios library that can help me to achieve this goal. 
  If there is no such library, can anyone guide if it is even physible or what approach should I follow ?</p>