title: Image comparison algorithm for finding the most similar image in a set
body: <p>Is there an algorithm that can take one image as an input and a list of images as second input and tell which one is the most similar ? In our problem we can have images which are the same buy look different due to watermarks. So we would need to identify matching images even when watermarks are different.</p>
  
  <p>Are neural networks used for this? Is there a particular algorithm? </p>