Q: "Woman wearing a stocking cap, standing in a subway tunnel." Does this mean that "The woman in the cap is standing outside."?
A: yes

Q: "A dog stands in a field with a tennis ball in his mouth." Does this mean that "The dog is playing fetch with his owner."?
A: it is not possible to tell

Q: "People dressed up in costume celebrating." Does this mean that "People are dressed in their normal clothes"?
A: no

Q: "Seven factory workers standing at work." Does this mean that "Seven workers are lounging in beach chairs."?
A:
no