A joint transform correlator may suffer from overlapping of the zero diffraction
order of the output, which does not contain relevant information, and the correlation
peaks that appear in the first diffraction orders if objects are not sufficiently separated.
Such overlapping significantly reduces the signal-to-noise ratio of the identification
process. We propose a novel approach based on code division
multiplexing technique in which the contrast of the identification peaks is significantly
enhanced. The approach does not include placing the two objects side by side but rather includes
code multiplexing them. Moreover, the code division multiplexing technique allows
the space–bandwidth product to be improved. Optical implementation results are given.
© 2006 Optical Society of America
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