&lt;title&gt;Optical correlation noise reduction: experimental techniques&lt;/title&gt;

Crowe, W. Michael; Hanson, Anthony C.; Gregory, Don A.

doi:10.1117/12.169450

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1996

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“…Despite a significant improvement in correlation achieved in recent years, low SNR remains a problem for identifying a small target in a large cluttered scene. 1 This is because the energy available from a small target to form a correlation peak at the output plane may be equal to or even less than the correlation noise because of a large volume of clutter. However, the main compromise to be accepted when using a correlator is the fact that it is only partially invariant.…”

Section: Introductionmentioning

confidence: 99%

All‐optical invariant target recognition based on intensity‐to‐phase coding

et al. 1996

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We have experimentally demonstrated the feasibility of a scale, rotation, and translation invariant all-optical processor for automatic target recognition. This simple processor consists of a single Fourier lens and uses a phase-coded input image of the target obtained by the recording of the original image onto a phase-only material through a Ronchi-type grating. A logarithmic distance measure is introduced to separate two classes of targets under the experiment. A real-time implementation of the processor is suggested utilizing a specially designed spatial light modulator.

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Section: Introductionmentioning

confidence: 99%