You can find other examples I'm sure... and why does everyone always think the US laws are different? They aren't in 99% of instances.
It does center around "a reasonable expectation of privacy"... If you stand in front of an open picture window, do you really expect that no one can see you? Do you really have an expectation of privacy? The answer is "no," that's why there are curtains/blinds. As far as the law is concerned "see" and "photograph" are synonymous here.
Now, if I creeped onto your property and took a picture thru the crack between closed blinds that would be different. The blinds were closed and there was a reasonable expectation of privacy. Plus I had to trespass in order to see/take the picture.
There are additional considerations regarding what the content of the image is... such as the "publication of private facts" (U.S. Law) or "the right to respect for private and family life" (U.K. Law). And *I think* you have relatively new laws that may be relevant as well (such as making public ones religious affiliation if private).