Improve georeferencing (clipping) of uploaded files by using stadardized markers (e.g. ArUco Markers)

[matthiasschaub]

Currently the most problems (detection but also performance) occur, due to a bad georeferencing or more precise, the clipping processes of the uploaded sketch.
At the moment there are 7 markers(globes) on the map with only 4 distinct once, also for right now the globs are only a support and not neccesary/mainly used for the clipping process, we need to change this!
There is a "standard" how to handle image detection/transformation with standardized markers. For example ArUco Markers (not sure what it stands for).
And opencv bring aruco marker generation and detection out-of-the-box.

• https://docs.opencv.org/4.x/d5/dae/tutorial_aruco_detection.html

We can complete get rid of the

• brisk
• flann
  and can use only the markers for clipping/transformation!