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Development of vehicle-license number recognition system using real-time image processing and its application to travel-time measurement

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4 Author(s)
Kanayama, K. ; Omron Corp., Kyoto, Japan ; Fujikawa, Y. ; Fujimoto, K. ; Horino, M.

In order to recognize vehicle license numbers in real time, a CCD (charge-coupled device) camera with electronic shutter and a hierarchical computer system with a general-purpose microprocessor and pipelined image processors have been developed. Much quicker extraction of the vehicle-license plate on the front-view image is realized by optimization of parameters using Taguchi's method. Distinct images outdoors can be obtained using a suitable control of the lens-diaphragm and continuous lighting via floodlight equipment. The results of field tests show that recognition rates of about 90% in the daytime and about 65% at night were attained. The processing time per vehicle is about 150 ms on average

Published in:

Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE

Date of Conference:

19-22 May 1991

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