License Plate Recognition System Based On DSP Chip

This paper introduces the designation, implementation and optimization of a LPR System based on the TI's DSP chip TMS320DM642. First, this system uses video camera to record video. Then the DSP board, which uses the video signals as input, captures image from the video, recognizes the license plate' s type, color and number, and uses JPEG algorithm to compress the image. At last, the result and the image is transmitted to PC and the result is saved as XML file.This system is divided into three parts: video camera, DSP system, PC-end software. The paper mainly explains the optimization of LPR software running on DSP board. Because of the difference between DSP system and PC, we have to use many ways to optimize the software. We improved the parallelism of code, reduced the operations and used the optimized libraries supplied by TI. After the optimization, the system can work faster than before and it achieves request for practical application. This paper also explains how the PC-end software gets results, saves them and let uses browser and manage them.At last, the paper expects the future work, such as adding light source to the system.