A license plate recognition (LPR) system with image sensors, which enables vehicle identification, plays a very important role in traffic flow control. In Thailand, chronic traffic congestion due to rapid motorization is a serious problem, and LPR can be one of the solutions. However, there are some technical obstacles to overcome such as the recognition of the Thai alphabet. We have developed a novel method that enables the LPR system to work well regardless of the plate format or alphabet. We conducted experiments using image data collected in Thailand, and obtained positive results with a plate detection rate of 94.6% and a character recognition rate of 92.0%. We will continue to improve the performance of the LPR system for practical use in Thailand.
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