Image motion compensator
First Claim
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.
1 Assignment
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Accused Products
Abstract
An image motion compensator which electronically compensates for image distortion in an electro-optical system is disclosed. The electro-optical system comprises a TV camera having an image intensifier portion which includes a plurality of deflection coils disposed therein for deflecting the electron image of the TV camera as a function of the current passing therethrough; and at least one optical element for guiding the line-of-sight of the TV camera to project predetermined target images on the receiving area thereof. More specifically, accelerometers are used to sense movement of a predetermined optical element of the electro-optical system. An electronic processing unit separates from the accelerometer measurements substantially that movement of the predetermined optical element which may be causing distortion to the projected target images and governs the current passing through the plurality of deflection coils based on the separated undesirable movement measurement to electronically compensate for this image distortion in the TV camera. In addition, the image motion compensator further alters the deflection coil current as a function of variations in the high-voltage potential which is applied across the image intensifier portion of the TV camera.
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Citations
8 Claims
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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. - View Dependent Claims (2, 3, 4, 5)
- 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;
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6. 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 reflector optical element being desirably pivoted about at least one axis 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 axis being normal to both the incident and reflected image paths of said reflector element, said reflector element incurring at times, undesirable translational and rotational movements with respect to said at least one axis which cause disturbances to said projected target images, an electronic image motion compensator comprising;
two accelerometers disposed at said reflector element oppositely about said at least one axis of said reflector element for generating signals representative of the movement of said reflector element; a summing amplifier for subtracting the accelerometer signals to eliminate therefrom that portion of the signals which is representative of translational movement of said reflector element; a high pass filter cascaded with said summing amplifier to filter out from the output of said summing amplifier that frequency content associated with the desirable pivotal movement of said reflector about said at least one axis and passing substantially that frequency content associated with the undesirable rotational movement of said reflector; two cascaded integrators for double integrating the output of said high pass filter to generate a signal representative of the undesirable rotational displacement of said reflector about said at least one axis, said undesirable rotational displacement causing distortion of said projected target images; and a current amplifier for supplying current to said plurality of deflection coils as governed by the generated signal from said double integrator to electronically compensate for the distortion of said projected target images in said TV camera. - View Dependent Claims (7, 8)
- and at least one reflector optical element being desirably pivoted about at least one axis 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 axis being normal to both the incident and reflected image paths of said reflector element, said reflector element incurring at times, undesirable translational and rotational movements with respect to said at least one axis which cause disturbances to said projected target images, an electronic image motion compensator comprising;
Specification