title: multiple choice test mark reader - where to start?
body: <p>I was assigned a project (in school) for automated multiple choice test scoring and I do not know where to start.<br>
  I think his is a kind of popular program and you already know about it. Enter an image file scanned of the answer sheet and return results.<br>
  Everything I know about computer vision is a few examples of photo editing with OpenCV. I hope you can give me a few keywords related to the problem or maybe a couple of blog articles, documents and related libraries.<br>
  Is there any free open source programs that I can refer to?<br>
  Thanks!<br>
  Edit: Add 2 example of the answer sheet (sory that I cannot find a sheet in English):</p>
  
  <p><img src="https://i.stack.imgur.com/WEDPI.jpg" alt="example 1">
  <img src="https://i.stack.imgur.com/GJ7TC.jpg" alt="example 2"></p>