Abstract
A rotation invariant optical correlator using a low-cost, liquid crystal television (LCTV) in the Fourier plane is described. The performance of the LCTV used as a filter support medium is evaluated, using interferometric measurements and an image reconstruction experiment. Different operating modes of an LCTV suitable for encoding binary phase-only filters are discussed. Finally, a modified LCTV is used in the filter plane of a conventional 4-f correlator to encode unipolar binary phase-only matched filters and unipolar binary phase-only circular harmonic filters. Optical experimental results are compared with the results of computer experiments.
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