1. An apparatus for enhancing video images of a subject comprising: means for obtaining a first image of said subject, and for subsequently obtaining a second image of said subject; means for subtracting one of said first image and said second image from the other of said first image and said second image to obtain an intermediate difference image; transformation mapping means for increasing the intensity of said difference image by applying a monotonically increasing pixel to pixel intensity transformation to said difference image; and means for adding said increased intensity difference image to one of said first image and said second image to obtain a resultant image wherein the difference is between said first image and said second image are highlight in said resultant image when displayed on a video monitor.