Input: Identify the most salient words:

turn the camera upside down so that the lens is facing away from you .

Output: face
lens
turn

Input: Identify the most salient words:

grass growing in the gutter of an old farm building

Output: building
grass
grow

Input: Identify the most salient words:

round panorama of some trees in a forest in autumn

Output: autumn
panorama
tree

Input: Identify the most salient words:

People pulling their luggage as they walk

Output:
luggage
pull
walk