I don't think there's any reasonable assumption of privacy on a public street, or in windows that face a public street. That's why most people tend not to undress in front of open windows (unless one is into such a thing, and not that there's anything wrong with that).

Seriously, though, there are all sorts of pictures and video that one might end up in, whether it's for the news or a family snapshot. If one is worried about being noticed in public, than one should probably stay home.