title: Scanned image and original image matching
body: <p>I have scanned image (2000 * 2500) and the original image of it. I want algorithm or open source API to develop a function which would give me the probability of matching these two images. I am developing this in C#. some of the issues are:</p>
  
  <p>Do I need to work around on the image rotation part ? You never know what will come from scanner.</p>