title: Calculate Pupilary distance in android by image processing
body: <p>I want to build an App that calculate the distance between pupil of eye of a person
  When I googled it, I found a way to calculate the distance using magnetic strip of the credit or debit card.<br>
  Now let suppose i have image of a person holding credit card, how to calculate length of magnetic strip of card and distance between the pupil in the image
  <br>Any kind of help will work
  <br>Thanks in advance</p>