title: Extract numbers from Image
body: <p><img src="https://i.stack.imgur.com/WfxA7.png" alt="credit recharge card"> 
  I have an image for mobile phone credit recharge card and I want to extract the recharge number only (the gray area) as a sequence of number that can be used to recharge the phone directly </p>
  
  <p>This is a sample photo only and cannot be considered as standard, thus the rectangle area may differ in position , in the background and the card also may differ in size .The scratch area may not be fully scratched , the camera's depth and position may differ too . I read a lots and lots of papers on the internet but i can't find any thing that could be interesting and most of papers discuss detection of handwritten numbers .
  Any links or algorithms names could be very useful .</p>