基于STM32的车牌识别系统的实验设计及应用  

Experimental Design and Application of License Plate Recognition System Based on STM32

作　　者：王旭 庄勇 金家锋 赵炼升 WANG Xu;ZHUANG Yong;JIN Jiafeng;ZHAO Liansheng(Aecc Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095

出　　处：《自动化应用》2024年第10期205-208,共4页Automation Application

摘　　要：以提高工程技术人员实践能力为目标,采用软硬件结合的方式,设计了基于STM32的车牌识别系统实验。以STM32单片机为实验平台,采用OV7670摄像头和TFT显示屏搭建了硬件系统;以C语言为基础,设计了软件流程。车牌识别实现包含图像预处理、二值化处理、识别车牌区域、字符分割和字符识别5个步骤。为解决光照和车牌表面洁净度不高对车牌识别准确度的影响,首先采用高斯滤波对图像预处理,之后利用跳变点设置上下边界阈值确定车牌识别区域,最后采用上下边缘投影法完成字符分割任务。实践表明,该实验提高了车牌识别检测精度,加深了工程技术人员对嵌入式技术的认知,提升了工程技术人员的实践能力和创新能力。With the goal of improving the practical ability of engineering and technical personnel,an experiment of license plate recognition system based on STM32 was designed by combining software and hardware.The STM32 microcontroller was used as the experimental platform,and the hardware system was built with OV7670 camera and TFT display.Based on the C language,the software process was designed.The implementation of license plate recognition includes five steps:Image preprocessing,binarization,recognition of license plate regions,character segmentation,and character recognition.In order to solve the influence of low surface cleanliness of lighting and license plate on the accuracy of license plate recognition,firstly,Gaussian filter is used to preprocess the image,then the upper and lower boundary thresholds are set by using the jump point to determine the license plate recognition area,and finally the upper and lower edge projection method is used to complete the character segmentation task.The practice shows that the experimental design improves the accuracy of license plate recognition and detection,deepens the understanding of embedded technology of engineering and technical personnel,and improves the practical ability and innovation ability of engineering and technical personnel.

关 键 词：STM32单片机 车牌识别 二值化 字符识别 嵌入式技术 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]