title: After Effect's Rotoscoping brush algorithms
body: <p>I don't think I'm going to get any replies but here goes: I'm developing an iOS app that performs image segmentation functions. I'm trying to implement the easiest way to crop out a subject from an image without the need of a greenscreen/keying. Most automated solutions like using OpenCV just aren't cutting it.</p>
  
  <p>I've found the rotoscope brush tool in After Effects to be effective at giving hints on where the app should be cutting out. Anyone know what kind of algorithms the rotoscope brush tool is using?</p>