Changes made for OpenCV 2.4.2 compatibility
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/nonfree/features2d.hpp"
using namespace cv;
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
+#include "opencv2/nonfree/features2d.cpp"
using namespace cv;
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/nonfree/features2d.cpp"
using namespace cv;
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/nonfree/features2d.cpp"
using namespace cv;