Device for the elimination of the effect of background radiation on the image representation in an ir-camera
AssigneeAGA Aktiebolag
InventorsJan Dahlqvist, Bo Matsson, Benny Johansson
Life of this patent
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Abstract
A device for the elimination of the effect of background radiation on the image representation in an IR-camera comprises scanning elements and a detector for the conversion of IR-radiation to a video signal and this video signal is supplied to an image representation unit via an a.c. voltage-coupled circuit, an image signal and a background signal appearing periodically and separate from each other in the camera.
Claims2
A device for the elimination of the effect of background radiation on the image representation in an IR-camera, which comprises scanning elements and a detector for the conversion of IR-radiation to a video signal, a-c coupling means for coupling said video signal to an image representation unit, said video signal including an image signal and a background signal appearing periodically and separate from each other on said detector, switching means in the path of the video signal between said detector and said a-c coupling means therefor, said switching means being operative to open and close the signal path for the video signal periodically under control from said scanning element, whereby only the part of the video signal which contains said image signal is passed to said image representation unit.
Dependencies are inferred from the claim text.