A technique to reduce the influence of the dc and the complex-conjugate correlation signals that are inherent in a joint transform correlator is proposed. The key part of this technique is the use of a phase mask. The mask contributes only extraneous signals, so the influence of the signals is reduced. The desirable correlation signal is not affected, and its shape is retained. Computer simulations confirm the performance of the proposed phase-encoded joint transform correlator.
© 1998 Optical Society of America
(070.4550) Fourier optics and signal processing : Correlators
(070.5010) Fourier optics and signal processing : Pattern recognition
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
Takanori Nomura, "Phase-Encoded Joint Transform Correlator to Reduce the Influence of Extraneous Signals," Appl. Opt. 37, 3651-3655 (1998)