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I have installed opencv_contrib extra package using cmake

good ! make sure you have cmake -DOPENCV_ENABLE_NONFREE=ON

then, syntax has changed:

#include "opencv2/xfeatures2d.hpp"

Ptr<xfeatures2d::SURF> = xfeatures2d::SURF::create();

I have installed opencv_contrib extra package using cmake

good ! make sure you have cmake -DOPENCV_ENABLE_NONFREE=ON

then, syntax has changed:

#include "opencv2/xfeatures2d.hpp"

Ptr<xfeatures2d::SURF> surf = xfeatures2d::SURF::create();
surf->detectAndCompute(img, ....);