The implementation of nonlinear procedures in optical inforraation processing systems is the recently studied proruising step in the optical correlators development . Optical correlators with phase-only filters and binary phase-only filters belong to the class of such a nonlinear systems with the nonlinearity in the Fourier transfornt plane. The generalization of nonlinear matched filtering such that both the filter transfer function and the Fourier transform of the input objec are processed nonlinearly are recently under investigation. Pattern recognition by using phase nomation only is the particular case of nonlinear matched filtering. As a result of the nonlinear procedure one keeps only phase information about both the target and the input scene, and the pure phase-only correlation is realized. The discrimination capability of the phase-only correlation method is enhanced, even in comparison with the results obtained in the case of the phase-only filtering, and the autocorrelation signal is the diffraction limited delta function.

Date Published: 27 December 1990
PDF: 12 pages
Proc. SPIE 1347, Optical Information Processing Systems and Architectures II, (27 December 1990); doi: 10.1117/12.23416

Published in SPIE Proceedings Vol. 1347:
Optical Information Processing Systems and Architectures II
Bahram Javidi, Editor(s)