... where the butterflies are located in the room, he must first know the exact position of the cameras. The necessary calibration of the system can be carried out quickly and easily: To do this, an additional flying object with a measuring cross flies freely through the room for around 15 minutes and is recorded by the cameras. Using the recorded flight data, the computer can determine the exact locations and orientations of all cameras in the coordinate system. The construction of the 'eMotionButterflies' is limited to ...