Using SIFT for Augmented Reality

Question

I\'ve come across MANY AR libraries/SDKs/APIs, all of them are marker-based, until I found this video, from the description and the comments, it looks like he\'s using SIFT

Answer 1

I have tried SURF for 330Mhz Symbian mobile and it was still too slow even with all optimizations and lookup tables. And SIFT should be even more slow. Everyone using FAST for mobiles now. Anyway feature extraction is not a biggest problem. Correspondence and clearing false positive in it is more difficult. FAST link http://svr-www.eng.cam.ac.uk/~er258/work/fast.html