title: Which object recognition algorithm should I use?
body: <p>I am pretty new to CV, so forgive my stupid questions...</p>
  
  <p>What I want to do:<br>
  I want to recognize a RC plane in live video (for now its only a recorded video).</p>
  
  <p>What I have done so far:</p>
  
  <ul>
  <li>Differences between frames</li>
  <li>Convert it to grey scale</li>
  <li>GaussianBlur </li>
  <li>Threshold</li>
  <li>findContours</li>
  </ul>
  
  <p>Here are some example frames:</p>
  
  <p><img src="https://i.stack.imgur.com/rdip1.jpg" alt=""></p>
  
  <p><img src="https://i.stack.imgur.com/42EKN.jpg" alt=""></p>
  
  <p>But there are also frames with noise, so there are more objects in the frame.</p>
  
  <p>I thought I could do something like this:</p>
  
  <p>Use some object recognition algorithm for every contour that has been found. And compute only the feature vector for each of these bounding rectangles.</p>
  
  <p>Is it possible to compute SURF/SIFT/... only for a specific patch (smaller part) of the image?</p>
  
  <p>Since it will be important that the algorithm is capable of processing real time video I think it will only be possible if I don't look at the whole image all the time?! Or maybe decide for example if there are more than 10 bounding rectangles I check the whole image instead of every rectangle.</p>
  
  <p>Then I will look at the next frame and try to match my feature vector with the previous one. That way I will be able to trace my objects. Once these objects cross the red line in the middle of the picture it will trigger another event. But that's not important here.</p>
  
  <p>I need to make sure that not every object which is crossing or behind that red line is triggering that event. So there need to be at least 2 or 3 consecutive frames which contain that object and if it crosses then and only then the event should be triggered.</p>
  
  <p>There are so many variations of object recognition algorithms, I am bit overwhelmed.
  Sift/Surf/Orb/... you get what I am saying.</p>
  
  <p>Can anyone give me a hint which one I should chose or if what I am doing is even making sense?</p>