1. In the method of providing a display representative of objects of a scene where a video source provides a camera video signal having an amplitude proportional to an amount of light flux from said scene along a line of sight which traces a raster on said scene, the steps of: providing a density signal having an amplitude proportional to the antilogarithm of the amplitude of said camera video signal; comparing said density signal with a known range of density signals and providing a processed video signal having first and second amplitudes in response to said density signal being respectively within and outside of said known range; and displaying an image in response to selected frequency components of said processed video signal.