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18 October 1999 Optoelectronic hybrid license plate recognition system
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The technique of license plate recognition is important for traffic management's intelligentizing. A novel real time opto- electronic hybrid system is proposed and constructed for license plate recognition in this paper. A software algorithm accomplishes the extraction of characters from a license plate image. An optical coprocessor of correlation identification based on volume holographic storage and wavelet transform is developed to recognize the characters. Wavelet transform is introduced to improve the recognition accuracy. Its comparison with the conventional correlation is studied. Because the system can make a multichannel processing instantly in parallel, it is faster and more accurate than other systems for the license plate recognition. The feasibility of the system is testified by experimental results.
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Wenyi Feng, Yingbai Yan, Guofan Jin, Minxian Wu, and Qingsheng He "Optoelectronic hybrid license plate recognition system", Proc. SPIE 3808, Applications of Digital Image Processing XXII, (18 October 1999);

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