Instead of a battery-powered beacon you would likely use fiducials [0].
The issue I see with delivery to windows is all the clutter that is commonly found in front of windows such as power lines, tree branches etc. since that cannot yet be easily detected with computer vision and inexpensive 3D sensors.
The issue I see with delivery to windows is all the clutter that is commonly found in front of windows such as power lines, tree branches etc. since that cannot yet be easily detected with computer vision and inexpensive 3D sensors.
[0] https://en.wikipedia.org/wiki/Fiduciary_marker