| With the rapid development of our country's traffic, more and more persons possess of cars. The speedways, roadways and stopping places are increasing everyday. All the phenomena result in the appearing of Intelligent Traffic System. License Plate Recognition is an important subsystem of the Intelligent Traffic System. It is also an integrated intelligent project. It includes image collection, license plate location, image segmentation, character recognizing. These years, LPR system begins to be used in vehicle management in uptown, vehicle track and base reconnaissance in police department. Compared with PC LPR system, the embedded DSP LPR system has more advantages in size, weight, power consumption and image processing rate. So, it has become the first choose of more users.First of all, this paper introduces some basic knowledge of image. The two important facets is color space, image digit transformation and storage technology. Afterwards, this paper dissertates the realization ways of every process of LPR technology and proposes the ways of license plate location and license plate image segmentation which adequately use license plate's characteristics to realize. It also proposes the way of template matched twice which used to divide up the character images, it enhanced the character recognizing effect. In succession, this paper dissertates the designs of every hardware module of this DSP LPR system witch include video collection, power, reset, RAM/FLASH expending, JTAG and circuit debugging module. Finally, the paper dissertates DSP exploitation technology which including the CCS integrated exploitation environment, the configuring and using of DSP/BIOS, and the optimization of code.The experimentations indicate that the ways of LPR proposed in this paper achieve a good recognizing effect and recognizing speed.In the end, it summarizes the tasks which accomplish by this paper and proposes some works which should be consummated by the research in the future. |
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