After having calculate SIFT or ORB on a frame, how to real time track the object in a video?
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Bascially I want to detect an object and than track it in a video (frame-by-frame).

I can detect it on the first frame with for example ORB or SIFT. But for the next frames (or say next XX frames) I would like to avoid to calulcate again all the keypoints (ORB or SIFT) to detect it again. 

Considering I  want to track it in a video real time, what could I do ?




