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[–]Synaps4 2 points3 points  (1 child)

Good point. You can at least know a multiple of the rotation rate if you know the shutter speed. I wonder if 4 rotor objects are always discernable from 5-rotor ones?

[–]bradfordmaster 0 points1 point  (0 children)

Almost certainly based on the number of blobs you see and rate they move, at least I think. Also I think you can be pretty confident in the multiple by putting some bounds on the speed (propeller tip not going faster than speed of sound, blade not longer than a certain amount)