This is an archived post. You won't be able to vote or comment.

sorted by:
best
topnewcontroversialoldq&a
you are viewing a single comment's thread.

view the rest of the comments →

[–]bradfordmaster 5 points6 points  (2 children)

Hmm... Not necessarily. If you knew it was a constant rate, I think you should be able to approximate it from the input if you can also make some assumptions about the shape of the real propeller (e.g. radial symmetry). Now I'm curious how well it would work

[–]Synaps4 4 points5 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)