Research Of License Plate Recognition System Based On TMs320Dm642

The LPR (License Plate Recognition) system is a significant part in ITS (Intelligent Transportation System), which increases Transportation Vehicle Monitoring System and Management Automation, and shows high practical value and economic value.This paper studied the LPR system based on TMS320DM642 chip. First of all, outlines the principles of LPR system, which based on TMS320DM642 has advantages in size, weight, power consumption and processing speed comparing with PC LPR system. Give us a solution of a LPR system based on DSP chip.Then to introduce the TMS320DM642 hardware development platform, including the TMS320DM642 chip structure, EVM, command systems and software development environment.Next to discuss each part of the algorithm of the LPR system in detail. Using the background difference to make the detective video of moving vehicles for single frame image of the vehicle, an improved Prewitt edge detection operator method, combining it with statistical projection to achieve plate positioning, vertical projection of Wavelet threshold denoising license plate image for segmentation, to get the license plate character segmentation for normalization, and using BP neural network for character recognition, to obtain license plate information.Finally, modular DSP software development of LPR system is accomplished through thread communication. The recognition results in the development of the Dot Net platform, client software on the PC display and storage. And the system code optimization, memory optimization, makes the LPR system based on DSP chip to run more efficient and faster recognition speed.