Abstract: A system is disclosed for optically detecting a target moving within a field of view. In particular, such a system includes a monochromatic image detector for generating a video signal corresponding to the field of view through which a target to be detected moves. The video signal is applied to a monochromatic TV receiver for displaying the applied video signals upon a suitable color display capable of displaying the applied video signal in at least two different colors or wavelengths of radiation. Switching circuitry is provided for applying a complete frame of the video signal to the display device to effect display of that frame in the first color and thereafter for applying a frame of the video signal to effect display of that frame in the succeeding color or colors. The rate at which the first and subsequent frames of the video signal are applied to the display means is such that such frames are displayed within a time period corresponding to that of the integration period of the human eye, e.g. .1-.