Holographic correlators can implement many correlations in
parallel. For most systems shift invariance limits the number of
correlation templates that can be stored in one correlator. This is
because the output plane must be divided among the individual templates
in the system. When the system is completely shift invariant, the
correlation peak from one correlator can shift into an area that has
been reserved for a different template; in this case a shifted version
of one object might be mistaken for a well-centered version of a
different object. We describe a technique for controlling the shift
invariance of a correlator system by moving the holographic material
away from the Fourier plane.
© 1999 Optical Society of America
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