摘要
基于车牌识别的智能车辆出入控制系统对道闸车辆放行有较高的实时性要求,为此,提出一种车辆检测至道闸放行过程的低时延处理方案。从摄像机预处理、图像传输、工控机后续图像处理3个环节入手,通过区域自动曝光的摄像机预处理提高后续车牌识别性能,摄像机抓拍图片时使用异步I/O传输,同时设计结合区域提取的图像分块传输流程,优化工控机客户端图像显示过程,提高系统各个处理环节的效率。实验结果表明,在确保车牌识别准确率的前提下,该方案可使系统车辆图像采集、接收、处理和送显过程的总时延降低到136 ms,达到业界车辆出入控制系统的领先水平。
Considering the demand of low latency of recognition,a design for reducing the latency of system proposed. This design mainly focuses on three aspects intelligent vehicle access control system based on license plate response performance from vehicle detection to lane release is pre-process in camera,image transmission and later-process in Industrial Personnel Computer （IPC）. Using regional Auto Exposure （AE） in camera and asynchronous I/O image transmission to improve the performance of later license plate recognition,it realizes a kind of block transmission method combined with image region extraction while also optimizing image display in client-side of IPC, to improve the efficiency of the system＇ s each processing part. Experimental results show that from image acquisition to receiving, to processing and at last to show,this scheme can make system take about 136 ms while at the same time ensuring the accuracy of license plate recognition, which reaches the leading level in the field of vehicle access control system.
出处
《计算机工程》
CAS
CSCD
北大核心
2015年第11期13-17,23,共6页
Computer Engineering
基金
浙江省重点科技创新团队基金资助项目(2011R09021-02)
关键词
车辆出入控制系统
低时延
图像传输
区域提取
车牌识别
自动曝光
vehicle access control system
low latency
image transmission
region extraction
license plate recognition
Auto Exposure （AE）
