c++ - Nonfree module is missing in OpenCV 3.0 -

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i have built opencv 3.0 alpha version source support cuda , tbb. now, want feature detection , feature matching using surf algorithm. surffeaturedetector present in include file

opencv2/nonfree/features2d.hpp & opencv2/nonfree/features2d.hpp

but module nonfree missing in version of opencv. tried checking opencv forums @ answers.opencv.org site under construction.

how use non free modules?

with opencv3.0, surf/sift , other things have been moved seperate opencv_contrib repo .

you have download that, add main opencv cmake settings (please @ readme there), , rerun cmake/make.

then:

#include "opencv2/xfeatures2d.hpp"  ... ptr<sift> sift = cv::xfeatures2d::sift::create(...); sift->detect(...);

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