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Optical pattern recognition in cuneiform inscription analysis

The application of a multifunctional extended optoelectronic correlator (MEOC) system in the field of pattern recognition is presented. The MEOC device is based on the extended optical correlator (EOC) architecture in conjunction with a digital image processing system. The EOC system is a three-lens coherent correlator with three separate planes usable for in- line spatial filtering of signals. Combining amplitude spatial filtering in both the frequency and image planes with complex filtering in the matched spatial filter (MSF) plane, the MEOC system was used for performing various complex procedures in the pattern recognition area. Furthermore, the MEOC device was advanced by inserting an analogue coherent optical averaging (ACOA) setup. Subjects of interest were cuneiform inscriptions on an original Babylonian cuneiform tablet. The investigations using the MEOC system were carried out in the following steps: feature extraction, average pattern mask production, average matched spatial filter production, and finally the correlation experiment. The results show that classical MSFs of averaged objects combine a low in-class sensitivity with a high discrimination ability for out-of-class objects, if suitable preprocessing steps have preceded.