Hello.
I want to test if I properly calibrated my camera. I succesfully calculate camera matrix, load XML files and open camera again with parameters loaded as explained here:
https://www.youtube.com/watch?v=v7jutAmWJVQ
and here:
https://docs.opencv.org/2.4/doc/tutorials/calib3d/camera_calibration/camera_calibration.html
But how can I know that camera calibtation was optimal? And how to visualize calibration effect?