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  4. Holographic correlator array with selectable shift-invariance
 
conference paper

Holographic correlator array with selectable shift-invariance

Levene, M.
•
Steckman, G.J.
•
Psaltis, D.  
1998
Proceedings of SPIE - The International Society for Optical Engineering

Optical holographic correlators can perform many correlations simultaneously. Because the output plane must be divided among the individual templates in the system, for many systems shift-invariance limits the number of correlation templates than can be stored in one correlator. 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. This paper describes a technique to control the shift-invariance of a correlator system by moving the holographic material away from the Fourier plane.

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