Averaged amplitude encoded phase-only filters for use in Fourier

Details Averaged amplitude encoded phase-only filters for use in Fourier Averaged amplitude encoded phase-only filters for use in Fourier

1991-04-30

1992-09-15

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

359 29, 364822, G02B 2746, G03H 116, G06E 300

Patent

active

051483165

ABSTRACT:
Method of producing an averaged amplitude mask, for use in conjunction with a phase only filter (pOF) to provide an averaged amplitude matched filter (AAMF) in a Fourier transform optical correlator, involves intensity normalizing a plurality of reference images within a given class of objects, averaging the intensities of the reference images, Fourier transforming the resulting data, and utilizing the resultant amplitude function, exclusive of phase, of the Fourier transform to produce the averaged amplitude filter. A number of such masks are sequentially positioned adjacent the POF to very rapidly determine whether an input image falls within a particular class of objects, or whether the input image is of a particular object within the class.

REFERENCES:
patent: 4588260 (1986-05-01), Horner
patent: 4765714 (1988-08-01), Horner
patent: 4826285 (1989-05-01), Horner
patent: 5024508 (1991-06-01), Horner
patent: 5040140 (1991-08-01), Horner
Flannery et al. "Design elements of binary phase-only correlation filters", Applied Optics, vol. 27, No. 20, pp. 4231-4235, Oct. 15, 1988.

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