Won't work. :' -( P> In a time of national uprising, these bots would be deployed to target areas to kill every live human, regardless of identity or political affiliation. Collateral damage would be of secondary importance to the Empire.
Now consider face recognition that would not be fooled into attacking a picture of a face, or a store manikin or the like, but would be savvy enough to attack a person with a mask that looks nothing like a person.
Certainly one could theoretically create so many of the things and have them attack en masse extremely indiscriminately....but a daisy cutter is probably way easier, cheaper, and more effective at that point.