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the create method is static, you have to use it like:

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

the create method is static, you have to use it like:

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

the create method is static, you have to use it like:

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

the create method is static, you have to use it like:

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