1. A thermal target display system for generating simulated thermal radiation patterns of selected real-scene objects, said system comprising: means for providing a video-compatible output signal representative of the thermal radiation image of said object; video signal processor means for digitizing and enhancing said video compatible signal, said video signal processor means generating output signals for a plurality of pixel elements defining a video frame; a thermal display screen having an array of individually controllable thermal radiating elements; and control means for selectively energizing individual ones of said array of thermal radiating elements in response to said output signals from said video signal processor means to generate a thermal radiation pattern on said display screen corresponding to said video frame, said control means including a converter for converting said output signals from said video processor means into respective temperature reference signals for said thermal radiating elements in said array, first temperature sensing means for sensing the temperature of each thermal radiating element to generate actual temperature signals corresponding respectively to the actual temperatures of said thermal radiating elements, and a comparator for comparing the temperature reference signal and the actual temperature signal for each thermal radiating element to provide an energizing output signal for each thermal radiating element until the actual temperature signal corresponds with the reference temperature signal.