1. A method of tracking a movement of an object in 3D space, the method comprising: capturing a plurality of temporally sequential images of the object within the 3D space; automatically defining a detection zone in the 3D space, the detection zone including at least a portion of the object; computationally analyzing the images to determine movement parameters associated with, and describing movement of, the object portion as the object portion moves in at least three dimensions, including a first dimension, a second dimension and a third dimension freely through the 3D space at least partially within the detection zone; computationally scaling the movement parameters to generate normalized parameters normalized in the at least three dimensions relative to the detection zone; tracking occurrences of motions of the object falling outside of the detection zone and for occurrences of motions of the object falling outside of the detection zone, adjusting a value of a discard parameter to reflect the occurrence; and comparing the discard parameter to a threshold and based upon a result of the comparing, altering the detection zone.