Image tracking system and technique
First Claim
1. An image motion tracking system for use with an image detector having an array of elements in the x and y directions, comprising:
- first means for creating a first frequency domain representation of a reference frame of image data;
second means for creating a second frequency domain representation of an input frame of image data;
processing means for detecting changes in phase of said frequency domain representation of said reference frame relative to said frequency domain representation of said input frame to discern a displacement of at least a portion of said input frame relative to at least a portion of said reference frame, said processing means generating at least one output signal indicative of said displacement; and
compensation means, responsive to said at least one output signal, for providing compensation for said displacement of said input frame relative to said reference frame.
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Abstract
An image motion tracking system (10) for use with an image detector (12, 14) having an array of elements in the x and y directions. First, frequency domain representations of an image are created to provide a reference frame of image data and an input frame of image data. A processor (30) is included for detecting a change in phase of the detector (12, 14) with respect to first and second samples of the reference frame relative to corresponding first and second samples of the input frame to discern a displacement of at least a portion of the input frame relative to at least a portion of the reference frame. Finally, the output signal is corrected to compensate for the displacement of the input frame relative to the reference frame.
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Citations
20 Claims
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1. An image motion tracking system for use with an image detector having an array of elements in the x and y directions, comprising:
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first means for creating a first frequency domain representation of a reference frame of image data; second means for creating a second frequency domain representation of an input frame of image data; processing means for detecting changes in phase of said frequency domain representation of said reference frame relative to said frequency domain representation of said input frame to discern a displacement of at least a portion of said input frame relative to at least a portion of said reference frame, said processing means generating at least one output signal indicative of said displacement; and compensation means, responsive to said at least one output signal, for providing compensation for said displacement of said input frame relative to said reference frame. - View Dependent Claims (2, 3, 4, 5)
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6. An image motion tracking system for use with an image detector having an array of elements in the x and y directions, comprising:
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first means for creating a first frequency domain representation of a reference frame of image data for first and second pairs of selected frequencies; second means for creating a second frequency domain representation of an input frame of image data for said first and second pairs of selected frequencies; processing means for detecting changes in phase between said first and second frequency representations to discern a displacement of at least a portion of said input frame relative to at least a portion of said reference frame; means for displaying said frames of image data; and electronic means for adjusting said displayed frames in response to said displacement.
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7. An image motion tracking system for use with an image detector having an array of elements in the x and y directions, comprising:
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first means for creating frequency domain representations of a reference frame of image data for first and second pairs of selected frequencies; second means for creating frequency domain representations of an input frame of image data for said first and second pairs of selected frequencies; processing means for detecting changes in phase between said first and second frequency representations to discern a displacement of at least a portion of said input frame relative to at least a portion of said reference frame; an optical arrangement; and means for adjusting said optical arrangement in response to said displacement.
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8. An image motion tracking system for use with an image detector having an array of elements in the x and y directions, comprising:
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first means for creating a first frequency domain representation of a reference frame of image data for first and second pairs of selected frequencies; second means for creating a second frequency domain representation of an input frame of image data for said first and second pairs of selected frequencies; processing means for detecting changes in phase between said first and second frequency representations to discern a displacement of at least a portion of said input frame relative to at least a portion of said reference frame; and alarm means for outputting a signal indicative of said displacement of at least a portion of said input frame relative to at least a portion of said reference frame.
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9. Apparatus for processing first and second time frames of image data, comprising:
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transforming means for transforming said first and second time frames from time domains to first and second frequency domain representations for selected frequencies only; and first processing means, responsive to an output of said transforming means, for determining at least one phase shift between said first and second frequency domain representations. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for determining displacement in an x-direction (δ
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x) and a y-direction (δ
y) of an image from a first time frame of image data to a second time frame of image data, comprisingmeans for storing said image data; and means for processing said image data as follows;
##EQU9## where fx1, fy1 are a first pair of selected frequencies,fx2, fy2 are a second pair of selected frequencies, ##EQU10## and where Q is a quotient of the fourier transform of the input time frame to the fourier transform of the reference time frame.
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x) and a y-direction (δ
Specification