Abstract

Multiple-object input to the recently introduced phase-extraction correlator may cause difficulties owing to interference effects. Similar effects have been observed previously in the nonlinear joint transform correlator. It is shown theoretically and by computer simulations that these effects are seldom observable in practice, and even then they can be substantially reduced by employing a proper space-variant threshold. The implementation of this scheme by a hybrid electro-optical architecture is also explained briefly and demonstrated. The results presented permit manipulation of information (spectral phase) that was previously believed to be contaminated beyond recovery.

© 1993 Optical Society of America

Multiple-object detection with a chirp-encoded joint transform correlator

Qing Tang and Bahram Javidi
Appl. Opt. 32(26) 5079-5088 (1993)

Fringe-adjusted joint transform correlation

Mohammad S. Alam and Mohammad A. Karim
Appl. Opt. 32(23) 4344-4350 (1993)

Error-diffusion binarization for joint transform correlators

Hanni Inbar, David Mendlovic, and Emanuel Marom
Appl. Opt. 32(5) 707-714 (1993)

Preprocessed multiobject joint transform correlator

M. S. Alam, O. Perez, and M. A. Karim
Appl. Opt. 32(17) 3102-3107 (1993)

Joint-transform correlation under varying illumination

Mohammad S. Alam and Mohammad A. Karim
Appl. Opt. 32(23) 4351-4356 (1993)