As long as the picture does not reveal the identity of the
person, does it warrant an invasion of privacy?
If the person happens to recognise the picture taken was of
him/her, does the person has the grounds to sue?
On what basis does the person recognise the picture taken was of
him/her?
Even if the picture reveals the identity of ther person, it
doesn't mean invasion of privacy unless the picture is focused on 1
particular person or somehow, the way the picture is taken is
questionable of its motive, then it might be counted as invasion of
privacy.
If the person finds out that him/her is in the picture, they
have no grounds to sue them unless they can prove that the nature
of the picture is bad and is focus of him/her.
As for your third question, it's rather difficult to say. Maybe
you compare two photos taken, one with the subject in the
foreground as the focus, and another with the subject in the
background [maybe an accidental inclusion in the picture].
Hope these clear your doubts.
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Thank You for your clarification.
Though I still think it is very difficult to place a
"relative" to as how questionable the picture is
to the person taken and the person taking the
picture. My engrish not good, hope you know what I
meant....