Discrete complex correlation device for obtaining subpixel accur

Details Discrete complex correlation device for obtaining subpixel accur Discrete complex correlation device for obtaining subpixel accur

1984-07-12

1990-02-06

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

342196, 342378, G01S 1390

Patent

active

H00007412

ABSTRACT:
This invention is directed to an image processing arrangement used to estimate image displacement relative to a reference frame. It comprises a discrete complex correlator, an associated interpolator, and a displacement estimator. The unique nature of the system is its ability to estimate shifts of a fraction of a pixel for sparcely sampled data. This is accomplished by extracting the complex gradients from the gray scale data and in turn correlating the gradients via a discrete complex correlator. The resulting cross correlation function is then interpolated to yield an accurate estimate of the shift. The invention is particularly adapted for use in the autofocus portion of a synthetic aperture radar imaging system.

REFERENCES:
patent: 3943277 (1976-03-01), Everly et al.
patent: 3955046 (1976-05-01), Ingham et al.
patent: 4162775 (1979-07-01), Voles
patent: 4244029 (1981-01-01), Hogan et al.
patent: 4330833 (1982-05-01), Pratt et al.
patent: 4368456 (1983-01-01), Forse et al.

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