Q: "The man in the purple shirt is walking towards the policeman who is standing on the pedestrian crossing." Does this mean that "there is a policeman standing outside"?
A: yes

Q: "A girl and a little boy are looking through a camera." Does this mean that "kids looking through a camera"?
A: yes

Q: "A group stands waiting for children to perform." Does this mean that "People are standing."?
A: yes

Q: "A police offer wearing sunglasses stands in a crowd of other officers with his arms crossed." Does this mean that "A police officer keeps the peace at a protest."?
A:
it is not possible to tell