Recently, we proposed an approach to obtain a single on-axis correlation wi
th use of a joint transform correlator. That method required a displaying d
evice with a determinate configuration, however, in this work we introduce
a modification to be used with a modulator without a full 2 pi phase modula
tion. This variation is based on a binary joint power spectrum and it requi
res an interferometric process to obtain a single detection peak. We presen
t a setup to carry out the whole process optically and we show experimental
results that validate this new approach. (C) 2000 Elsevier Science B.V. Al
l rights reserved.