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Proceedings Paper

Complex linear morphology for intensity and distortion-invariant pattern recognition
Author(s): Laurence G. Hassebrook; Mohammad Rahmati; Raymond C. Daley; Michael E. Lhamon
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Paper Abstract

Any desired diffraction pattern can be produced in the Fourier plane by specification of a corresponding input plane transparency. Complex-valued transmittance is generally required, but in practice, phase-only transmittance is used. Many design procedures use numerically intensive, constrained optimization. We, instead, use a noniterative procedure that directly translates the desired, but unavailable, complex transparency into an appropriate phase transparency. At each pixel the value of phase is pseudorandomly selected from a random distribution whose standard deviation is specified by the desired amplitude. We apply the pseudorandom phase-only encoding to hybrid composite filter design. These filters are used in a filter bank architecture to perform intensity- and distortion-invariant pattern recognition.

Paper Details

Date Published: 1 March 1994
PDF: 13 pages
Proc. SPIE 2237, Optical Pattern Recognition V, (1 March 1994); doi: 10.1117/12.169439
Show Author Affiliations
Laurence G. Hassebrook, Univ. of Kentucky (United States)
Mohammad Rahmati, Univ. of Kentucky (United States)
Raymond C. Daley, Univ. of Kentucky (United States)
Michael E. Lhamon, Univ. of Kentucky (United States)

Published in SPIE Proceedings Vol. 2237:
Optical Pattern Recognition V
David P. Casasent; Tien-Hsin Chao, Editor(s)

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