Add opencv calib include

src/vision_utils.h

@@ -28,6 +28,7 @@ using namespace boost::assign; // bring 'operator+=()' into scope
 #include <opencv2/xfeatures2d/nonfree.hpp>
 #include <opencv2/xfeatures2d.hpp>
 #include <opencv2/line_descriptor/descriptor.hpp>
+#include <opencv2/calib3d.hpp>
 
 typedef std::vector<cv::Point2f> PointVector;
 typedef std::vector<cv::KeyPoint> KeyPointVector;