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United States of America Patent
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Jun 15, 1993
Grant Date -
N/A
app pub date -
Nov 21, 1990
filing date -
Nov 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A holographic optical correlator includes a matched optical filter and control means therefor including a memory. In use searching for occurrences of an item to be found is carried out by the control means controlling the input and Fourier transform planes of the filter and a coherent light source for parallel optical processing of the memory content and the output plane of the filter provides information to the control means as to the location in the memory of occurrences of said item. The complexity of the detector means in the output plane can be reduced in comparison with previous proposals by moving the item to be sought step-wise across the input plane. The detector means then may comprise a single column of detectors which are required to detect a peak correlation signal within a predetermined range.
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