sift - How to use SiftDescriptorExtractor in openCV 3.0.0 -

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i use siftdescriptorextractor in such use : 

siftdescriptorextractor detector;

and try type bellow: 

#include <opencv2\nonfree\features2d.hpp> #include <features2d.hpp>      #include <opencv2\features2d\features2d.hpp> #include <opencv2/features2d.hpp>

but non of them work properly. know right way use siftdescriptorextractor in opencv 3.0.0 ?

the standard opencv 3.0 builds no have sift included. need build , install contrib module use sift. see opencv_contrib. please take notice of licensing terms of sift algorithm.


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