Optoelectronic hybrid correlator based on a programmable LCTV spatial light modulator

We describe a hybrid processing real time optical correlator that uses programmable liquid crystal teleiesion (LcTr) spatial optical modulator. A joint transform optical correlator with a photorefractive crystal BSO has been successfully applied to real time object recognition. Hoerer, a major shortcoming of this optical correlator is its sensitivity to the scale and orientation of the test image. Thus, its application is restricted. We present a scale- and rotational-invariant correlation hybrid processing system, namely a joint transform digital-optical correlator using photorefractive crystal BSO and programmable LCT spatial light modulator.