DONE CODE PROJECT Marker detection error https://discuss.ardupilot.org/t/precision-landing-with-ros-realsense-t265-camera-and-apriltag-3-part-2-2/51493 http://chev.me/arucogen/ https://www.learnopencv.com/install-opencv-3-4-4-on-ubuntu-16-04/ https://docs.opencv.org/trunk/d5/dae/tutorial_aruco_detection.html