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This problem comes into me recently, and finally I notice that, the keypoints detected by Sift are different from Surf on their variable "size". Most Sift keypoints' size are range from 0.x to 10.x, while Surf keypoints' size are 1x.0 to 100+. That's what make Surf much slower. So if you use the same keypoints, Surf will be much faster than Sift.
