title: Detecting credit card edges using opencv and python
body: <p>I'm hoping this is very simple; I suspect that's the case. </p>
  
  <p>I have an app that takes an image from the user in which they're holding a credit card up, stripe side out. Something like this: <a href="http://imgur.com/OOanf9i" rel="nofollow">http://imgur.com/OOanf9i</a></p>
  
  <p>This is already being fed through a python script to assist in pupil detection, and I'd like to add the ability to detect the edges of the credit card, width-wise. I've done some research into openCV but it seems like a VERY in-depth topic, and I believe this is a simple case. </p>
  
  <p>Can anyone give me any direction on how to accomplish this? Or just how difficult it might be to do? </p>
  
  <p>Thanks!</p>