Abstract

The license plate recognition system (LPRS) is a very important development direction of the intelligent transportation systems (ITS). With the development of the society and the enhancement of human living level, the amount of vehicle increases continually and the traffic status is deteriorating gradually, which brings large pressures for the society and the environment. The increasingly crowded city traffic needs more advanced and effective traffic management and control. It has been an important research direction to utilize the license plate recognition technology to enhance the management level and the traffic efficiency, and implement safe intelligent transportation management. In this article, the design, implementation and optimization of the DSP license plate recognition system which takes the TMS320C6201 of TI Corporation as the core chip were introduced. In this system, the video frequency (VF) decoding chip first translates the analog TV image signals obtained from CCD into the digital image signals which are inputted into DSP through FIFO buffer by the control of CPLD, and then aiming at the image, DSP performs the license plate positioning, the license plate character segmentation, the license plate character identification, the optical aberrance emendation, the nonlinear emendation of speed error and other algorithm operations to obtain the result of the license plate identification.

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