1. A method of visualizing an activity corresponding to an event in one or more frames comprising the steps of: (a) classifying each pixel in the plurality of frames as representing one or more foreground objects and one or more background objects; (b) assigning one or more alpha mask values for each classified pixel in each frame; (c) manipulating the plurality of alpha values; and (d) applying the plurality of alpha values to each pixel to visualize the activity.