title: Image Comparison for find percentage of similarity between images
body: <p>I want to compare set of images with the given template/ideal image. All images are similar to template image, I want to compare the images and find out the percentage of similarity between the template &amp; rest of images. </p>
  
  <p>Is there any open source or third party software for doing it.</p>
  
  <p>I want to mainly use C# .Net as the technology.</p>