Solve problem 'SURF' is not a member of 'cv'

SIFT and SURF were moved to nonfree module. You need to add

#include <opencv2/nonfree/nonfree.hpp>

header and link with opencv_nonfree library.

本文转自博客园Grandyang的博客，原文链接：Solve problem 'SURF' is not a member of 'cv'，如需转载请自行联系原博主。