Abstract: Optimal incoherent filters are proposed for distortion- invariant and noise-tolerance correlation. The optical transfer function (OTF) of the correlator is specified as a realizable phase-only term which is modified by a passband function. The phase-only term is optimized by the simulated annealing for producing a sharp and distortion-invariant correlation peak, and the passband function is selected by a direct iterative search algorithm to achieve the noise- tolerant image recognition. The designed OTF is generated by dual-filter synthesis. The correlation output is obtained from the subtraction between the correlation of two realizable filters with the input image. Optical experiments and computer simulations show that the proposed correlator can yield a sharp correlation peak with excellent distortion robustness and noise tolerance.!9
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