基于多源视觉的集料动态图像采集系统研究

发布时间：2018-03-19 12:54

本文选题：沥青混合料　切入点：动态级配检测　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：为解决当前沥青混合料生产中集料级配检测过程滞后、工序复杂、不能实时监控的问题,本文应用多源视觉技术,从沥青混合料原材料的选取环节进行集料动态图像采集研究,确立了大功率LED光源结合面阵相机的多源视觉动态图像采集系统方案,并给出了系统软、硬件的设计与实现方法。本文通过分析研究生产现场的拌合楼设备,确定了在集料下落环节架设图像采集系统,抽样采集离散状态的集料图像样本;设计了在线、自动控制的电动分料抽样采集装置及基于PLC的多轴运动控制系统;采用433M频段无线数据收发模块和宏观监控装置,实现了控制室与生产现场多个料仓的无线组网,保证抽样样本量及颗粒下落运动状态的远程无线、精确控制;提出了多个千兆以太网面阵相机并行采集的多源视觉方案,实现了生产现场多料仓集料图像的同步实时采集;选择自适应千兆以太网交换机配合光纤收发器,采用单模光纤传输图像数据,解决了多相机实时并行传输、传输数据量大、传输距离远的问题。为保证图像采集质量,设计了大功率LED光源结合黑色不透光屏蔽罩的补充光源方案,保证了系统的全天候恒定成像;倾斜黑色漫反射背景板和挡料板的设计,有效的降低了动态采集图像中所呈现的阴影。在LabVIEW环境下设计的集料实时检测软件能够满足矿质混合料生产过程中对集料级配实时监控的需求,软件界面友好。通过室内模拟和生产现场试验对比与验证,对集料动态图像采集过程中出现的问题提出了有效的改进措施,证明本系统能满足集料级配实时检测与控制的要求,检测结果具有科学性、客观性、准确性。
[Abstract]:In order to solve the problem that the process of aggregate gradation detection in the production of asphalt mixture is lagging behind, the process is complex and can not be monitored in real time, this paper applies multi-source vision technology to study the dynamic image collection of aggregate from the selection of raw materials of asphalt mixture. A multi-source dynamic image acquisition system with high power LED light source combined with area array camera is established, and the design and implementation of the system's hardware and software are given. The image acquisition system is set up in the falling link of aggregate, the discrete state of aggregate image sample is sampled, the on-line and automatic control device of electric sampling is designed, and the multi-axis motion control system based on PLC is designed. Wireless data transceiver module of 433m band and macro monitoring device are used to realize wireless network between control room and production site, to ensure remote wireless control of sample size and movement state of particle falling. This paper presents a multi-source vision scheme for parallel acquisition of multi-gigabit Ethernet array cameras, realizes synchronous real-time acquisition of multi-bin aggregate images in production site, selects adaptive gigabit Ethernet switch with optical fiber transceiver, Single mode optical fiber is used to transmit image data, which solves the problem of multi-camera real-time parallel transmission, large amount of data transmission and long transmission distance. In order to ensure the quality of image acquisition, The scheme of high power LED light source combined with black opaque shield is designed to ensure the constant imaging of the system, and the design of the inclined black diffuse reflection background board and the blocking plate. The real-time detection software designed in LabVIEW environment can meet the needs of real-time monitoring of aggregate gradation in the production process of mineral mixture. The software interface is friendly. Through the comparison and verification of indoor simulation and production field test, the effective improvement measures are put forward to the problems in the process of collecting dynamic image of aggregate. It is proved that the system can meet the requirements of real-time detection and control of aggregate gradation. The results are scientific, objective and accurate.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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