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-.2 seconds. Further, the color display is so adjusted that in the absence of a moving target within the field of view, the first and succeeding frames of the first and succeeding colors are in balance to present a monochromatic display, whereas if a target moves through the field of view, color aberrations appear above the periphery of the displayed moving target.
A system for detecting movement of an object within a field of view, said system comprising: a monochromatic TV camera for providing a composite video signal including all color components as sensed by said monochromatic TV camera to form a plurality of frames indicative of said field of view, said composite video signal being the same from said frame to frame in the absence of movement in said field of view, display means for receiving the composite video signal and operative in a first mode for displaying a first frame to form an image of said field of view in a first color and operative in a second mode for displaying a second frame to form an image of said field of view in a second color differing from said first color; and control means for operating said display means in its first and second modes within a predetermined integration time period whereby a moving object is distinguished in the image of said field of view displayed by said display means by color aberration about its peripheral edge portions.
Claim 2
Independent Claim
179 words
A system for detecting movement of an object within a field of view, said system comprising: a monochromatic TV camera for providing a composite video signal including all color components as sensed by said monochromatic TV camera to form a plurality of frames indicative of said field of view, said composite video signal being the same from said frame to frame in the absence of movement in said field of view, display means for receiving the composite video signal and operative in a first mode for displaying a first frame to form an image of said field of view in a first color and operative in a second mode for displaying a second frame to form an image of said field of view in a second color differing from said first color; and control means for operating said display means in its first and second modes within a predetermined integration time period whereby a moving object is distinguished in the image of said field of view displayed by said display means by color aberration about its peripheral edge portions.
Claim 3
Dependent Claim
23 words
The system as claimed in claim 1, wherein the integration time period is selected to be the integration period of the human eye.
Claim 4
Dependent Claim
60 words
The system as claimed in claim 1, wherein said display means displays the first and second colors in such balance that those portions of said field of view which do not move between the display of the first and second frames are displayed as a composite of the first and second colors without color aberration about their peripheral edge portions.
Claim 5
Dependent Claim
52 words
The system as claimed in claim 1, wherein said control means includes a counter responsive to each frame of the video signal for providing an output corresponding to n number of frames whereby n frames of a single color are displayed by said display means before the display of the next color.
Claim 6
Dependent Claim
49 words
The system as claimed in claim 1, wherein said display means comprises a cathode ray tube having first and second luminscent screen portions for respectively providing the first and second colors, and first and second electron guns for directing corresponding electron beams reespectively upon the first and second phosphors.
Claim 7
Dependent Claim
50 words
The system as claimed in claim 5, wherein said control means comprises a switching circuit for applying the video signal to the first electron gun to display a first frame of the first color and thereafter to said second electron gun to display a second frame of the second color.