title: Algorithm to compare 2D point sets of human body images
body: <p>I am working on algorithm to compare two 2D point set. More specifically I have skeleton of two human body images as a 2D point set (25 points each, for example) and I want to find to what extent they are similar and which points, lines from one point to another or angles between lines makes images different. </p>
  
  <p>Each point in the point set always corresponds to one part of human body. For instance point #2 corresponds to left shoulder and point #9 to left knee. All points are equally important. </p>
  
  <p>I need to find whether point #2 of the first skeleton is in the similar position as point #2 of the second skeleton, and so on for all points in skeleton. </p>
  
  <p>Point sets are not normalized.  </p>
  
  <p>I would like to know if there are exist any algorithms or API to solve my problem? </p>