应用于公路收费站系统的车牌识别

【作者】 郭燕斌；

【导师】 解梅； 龚海烈；

【作者基本信息】 电子科技大学 ， 电子与通信工程， 2007， 硕士

【摘要】 本文是主要针对公路收费站的智能化交通管理需求,进行汽车牌照图像识别处理系统的应用研究。在借鉴国内外相关研究成果基础上,运用图像识别知识和工程方法,充分利用收费站已有的软硬件设施,通过对视频图像的采集和实时处理,实现车牌识别的系统应用,为交通管理部门进行管理提供重要数据和依据。具体针对九环线绵管段收费站的实际情况和管理单位要求,实现了车牌识别在公路收费站的实际应用。系统总体设计采用嵌入式软件处理方式,利用原有安防系统的稽核工控主机作为处理平台,将车道摄像机采集的图像送入平台进行处理,识别结果送入后端处理模块进行处理和应用。图像采集部分选用预埋双感应线圈作为主触发方式,视频移动侦测作为补充;前端摄像机选用高清晰宽动态强光抑制型产品;利用海康H系列视频采集卡的回调函数进行图像抓拍,完成前端的图像采集功能。识别核心选用深圳普利得的PlateDSP^TM型嵌入式产品,利用其OCX控件提供的回调函数对前端采集的图像进行识别处理。后端处理模块采用Access2000进行数据库搭建,与管控中心进行联网,实现对识别结果的应用处理,完成黑名单比对、记录、统计、查询、打印和网络传输等功能。系统经过实际工程应用实测,车辆抓拍成功率超过99%,车牌识别正确率超过90%,车流量统计误差低于5%,完全达到用户实际需求。更多还原

【Abstract】 Aiming at the demand of the intellectualized traffic control for roadway toll station, this article carry out applied research on the system of license plate recognition. Based on the relevant domestic and overseas research results, profits from the image recognition knowledge and engineering methods, and take full of the ready-made facilities, through gathering and instant processing the video images, then achieve the recognition. The system provides important data and evidence for traffic management departments. Regarding the actual situations of toll station within Mianyang segment for the road between Mianyang and Jiuzhaigou, it realizes the practical application of license plate recognition at the road toll station according administrative requirements.The general system design use the embedded software processing mode, and take the auditting host computer which is for the original security system as the platform, send the pictures gathered from the camera to the platform to process, the recognition result will be delivered to back modules to carry on processing and the application.For the part of gathering images, Pre-burying the double induction coil be selected to be main triggering way, video mobile detection is a supplementary. We select the high definite and width dynamic and bright light inhibit product in the front segment. It carry on the snapshot for images with the call-back functions of the H series of video gathering card from Haikang, and completes the image gathering function.The recognition core is selected by PlateDSP embedded product from Shenzhen Pulide Co. , it process the images from the camera in the front segment by call-back function which got from OCX controls.We use Access2000 to build the database. The system connects with the controlling center. It realizes the applied processing, and completes the functions such as contrast, recording, statistics, inquiry, printing and network transmission and so on.After the practical application, the success ratio for capturing vehicles surpasses 99%, the accuracy ratio for recognition is more than 90%, the statistic error for traffic flow is lower than 5%, completely achieve the actual demand for users.更多还原