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Image motion compensator

  • US 4,245,254 A
  • Filed: 08/30/1978
  • Issued: 01/13/1981
  • Est. Priority Date: 08/30/1978
  • Status: Expired due to Term
First Claim
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1. In an electro-optical system including a TV camera having an image intensifier portion and a plurality of deflection coils disposed therein for deflecting the electron image of said TV camera as a function of the current passing therethrough;

  • and at least one optical element disposed external to said TV camera for guiding the line-of-sight path of said TV camera to project predetermined target images on the receiving area of said TV camera, said at least one optical element incurring, at times, both desirable tracking stabilization movement to substantially prevent image movements with respect to said TV camera and undesirable vibrating movements causing unwanted resolution distortions to said projected target images in said TV camera, an electronic image motion compensator comprising;

    at least two accelerometers coupled to said at least one optical element in said electro-optical system for generating signals representative of translational and rotational movement of said at least one optical element with respect to at least one axis thereof;

    first means for eliminating from said accelerometer signals that portion representative of said translational movement and that portion representative of said rotational movement having frequencies substantially within a first frequency range to separate substantially from said accelerometer signals a first signal representative of said undesirable rotational vibrating movements of said at least one optical element having frequencies falling within a second frequency range which is greater than said first frequency range;

    second means for converting said separated first signal into a second signal which is representative of said resolution distortion to said predetermined target images; and

    third means for supplying current to said plurality of deflection coils as a function of said second signal to electronically compensate for said resolution distortion of said projected target images in said TV camera.

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