I walk by a whole flock, every morning. They all know me, and go about their business, as If I'm not even there. The Turkey Vultures are the same way. But let a stranger come near, and they take to the trees and rooftops. And I don't wear a hat, or a 'big plastic thing'. So I can only believe that they do recognize individual humans, that they are accustomed to seeing.

In my experience crows not only recognize people, they can read your mind, and I’m not kidding.

Crows are smart but I tend to think that Aussie Magpies, the birds that is, are even smarter.
I have a pair of Magpies that always arrive just when I'm about to feed my chickens and leave some aside for the other native birds as well.
If I'm running a bit late, the Magpies will sit on my roof and warble until I come out with the food, they do this with great regularity.