I'm using ORB on my project and i have decided to chanced my extractor to freak with opencv 2.4.2.Now i'm working on Freak but it works slower than ORB.I don't understand cause of the paper about freak.It says " it's very fast (comparable to ORB)".I used Fast and Surf for keypoints extracting,both of them are slow.Do you have any idea about it?