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Vehicle License Plate Recognition Method Robuse to Changes in Lighting Conditions  

Nam, Kee-Hwan (관동대학교)
Bae, Cheol-Soo (관동대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.9, no.1, 2005 , pp. 160-164 More about this Journal
Abstract
The process of recognizing a vehicle involves detection of the vehicle, recognition of the vehicle model, and identification of the vehicle. The process of vehicle identification involves identification of the vehicle itself, such as by recognition of the license plate on the vehicle. In this paper the method involves the use of a beam splitter to divide incident rays into two directions, a transmitted beam and a reflected beam of different light intensities, and synthesizing two captured images using CCD devices from each beam, thus producing fluctuation-free images of a wide dynamic range even when the subject is moving. A prototype license plate recognition system was also developed using the experimental sensing device. The system achieved a 98.7% recognition rate on 466 images of moving vehicles, which demonstrates its effectiveness as a license plate recognition system.
Keywords
License plate recognition; image processing; dynamic range; camera;
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