OpenCV 2.46 and SurfFeatureDetector

If you use SurfFeatureDetector function, you should include "opencv2\nonfree\nonfree.hpp" and "opencv_nonfree246.lib" .

This mean is surf and sift is not free, give the money to use in commercially.

But how to know using this lib or not?

em..

I don't know.

Thank you.