Once you step out your front door you are in public.
Anybody who can see you with their eyes can take a picture of you.
By the way, there's another camera aimed at you besides your neighbor's.
It's on a satellite circling the earth.
Install Google Earth on your computer and put in your address and you'll see an aerial view of your property. You might even be in the photo. Scan around to nearby shopping center parking lots and you'll see people walking to and from their cars.
Nobody's got an privacy when you are out in the open.