Q: "Two people signing books." Does this mean that "People are writing in books."?
A: yes

Q: "A little child is in full ski gear while standing on the snow." Does this mean that "A little child is fully geared and going to go ski down the mountain."?
A: it is not possible to tell

Q: "Little girl swinging on swing, accompanied by a man." Does this mean that "A little girl is on a swing and happy."?
A: it is not possible to tell

Q: "Woman with camera is throwing a Frisbee for her brown dog to catch." Does this mean that "A woman is sleeping in the field."?
A:
no