I suggest to use stderr as debugging output. It's because some useful so...

include/config/debug.hpp

@@ -48,7 +48,7 @@
 struct Sink { template<typename ...Args> Sink(Args const& ... ) {} };
 #if DEBUG_TEST
   #define VISENSOR_DEBUG(...) \
-      do { printf("[libvisensor]: "); printf(__VA_ARGS__); } while (0)
+      do { fprintf(stderr,"[libvisensor]: "); fprintf(stderr,__VA_ARGS__); } while (0)
 #else
   #define VISENSOR_DEBUG(...) Sink { __VA_ARGS__ }
 #endif

src/helpers/stereo_homography.cpp

@@ -145,7 +145,7 @@ void StereoHomography::getHomography(Eigen::Matrix3d& H0, Eigen::Matrix3d& H1, d
   Eigen::Matrix4d T_rel = Eigen::Matrix4d::Zero();
   T_rel = T1 * T0.inverse();
 
-  std::cout << "T_rel " << T_rel << std::endl;
+  std::cerr << "T_rel " << T_rel << std::endl;
   Eigen::Matrix3d R = T_rel.block<3, 3>(0, 0);
   Eigen::Vector3d T = T_rel.block<3, 1>(0, 3);
 

src/visensor_impl.cpp

@@ -108,7 +108,7 @@ void ViSensorDriver::Impl::init(std::string hostname) {
     setCameraCalibrationSlot(0);
   }
   catch (visensor::exceptions const &ex) {
-//     std::cout << ex.what() << "\n";
+     std::cerr << ex.what() << "\n";
   }
 
   //flip images if necessary