1. A method for tracking objects entering and exiting an environment, the method comprising: obtaining image data for one or more fields of view covering one or more paths by way of which objects can enter or exit the environment; identifying objects of interest represented in the image data; for each of the objects, determining from the image data whether the object is entering or exiting the environment and generating a signature for the object based, at least in part, on the image data; and after generating one or more entry signatures for objects determined to be entering the environment and at least one exit signature for objects determined to be exiting the environment, matching the at least one exit signature to the one or more entry signatures, such that each matched exit signature corresponds with one matched entry signature.