title: Frame differencing
body: <p>I am trying to detect motion for the purpose of object tracking using frame differencing, but my camera is a moving one mounted on UAV.</p>
  
  <p>So I am trying to return the case to static camera scenario through frame alignment so subtracting is done only on overlapped area.</p>
  
  <p>The methods I found use SURF to do the alignment,  but my goal is to reduce the process power needed. any suggestions? </p>