Holographic correlator arrays are a powerful tool for many pattern recognition problems because they are capable of computing multiple correlation functions fast and simultaneously. There is a trade-off between the number of templates packed and the amount of shift invariance allowed in the system design, because an error occurs when a correlation peak shifts into neighboring domains when the input is shifted. Shift invariance can be controlled by simply moving the recording material away from the focal plane of the Fourier lens [Ref. 1].
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