1 September 1992 Optical correlation using reduced resolution filters
Author Affiliations +
Optical Engineering, 31(9), (1992). doi:10.1117/12.58858
We determined the performance of an optical correlator as the filter SLM was reduced in resolution by a factor of M in a linear dimension. Our configuration allowed a constant reduction, by a factor of M2, in the amount of data used to describe the filter when compared to using a filter at full resolution. Reducing the resolution of the filter is shown to primarily affect its impulse response by the addition of copies of the filter image. We provide both general expressions for performance measures and guidelines for minimizing the distortion induced as the resolution of a filter is decreased. Furthermore, we show the effect of reducing the resolution of a binary phase-only filter on autocorrelation experiments and cross-correlation experiments containing competing objects. We obtained experimental results with an optical correlator with a magneto-optic SLM of 128 x 128 pixels in the input plane and a filter of 64 x 64 pixels. The results showed that our arrangement can provide comparable results to a full-resolution filter when the resolution is decreased by a factor of M and the object within the filter images is less than N/M x N/M pixels in size.
Samuel Peter Kozaitis, Wesley E. Foor, "Optical correlation using reduced resolution filters," Optical Engineering 31(9), (1 September 1992). http://dx.doi.org/10.1117/12.58858

Image filtering

Optical filters

Spatial light modulators

Optical correlators

Signal to noise ratio

Image resolution

Diffraction gratings


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