title: How to read a EAN-13 bar-code from an image in C?
body: <p>I would like to read a EAN-13 bar-code from an image in C.
  I found <a href="http://opencv.willowgarage.com/wiki/" rel="nofollow noreferrer">the OpenCV library</a> that should help me to compute the image as well as <a href="http://sudokugrab.blogspot.com/2009/07/how-does-it-all-work.html" rel="nofollow noreferrer">an article about an iPhone App that can read Sudoku.</a></p>
  
  <p>But in an other hand, I found <a href="http://www.libdmtx.org/" rel="nofollow noreferrer">an opensource library to read DataMatrix bar-code</a>.</p>
  
  <p>I would like to join an existing OpenSource project about reading bar-code instead of starting one, since I am sure that some people already worked on this.</p>
  
  <p>Do you have an idea of were to start and what to use to read EAN-13 barcode in C ?</p>