Abstract

A prototype real-time Chinese character recognition processor, which utilizes the Vander Lugt type complex spatial filter is presented. A real-time correlation operation is performed with a photoconductor-liquid crystal device as an incoherent-to-coherent image converter. Bandpass Fourier transform images passing through a bandpass spatial filter are sequentially recorded on a rotating hologram recording plate as stored reference patterns. It makes possible holding the stable discrimination for noisy unknown input patterns and storing a huge number of reference patterns. The typewritten Chinese characters in practice are experimentally discriminated from very similar ones in the real-time optical correlator. This indicates the possibility of more than 2000 printed Chinese character recognition with the optical correlation.

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