【作者】 曲仁军；

【导师】 顾畹仪；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2013， 硕士

【摘要】 随着社会的进步,多方位互联已经成为技术前进的方向。物联网被誉为下一代互联网的网络模型,受到了越来越多的国家和企业的重视。物联网由不同应用场景的无线传感网、电信传送网、互联网组成。视频数据一直在互联网中占据相当多的带宽,在物联网技术全面普及之后,各个传感网的视频数据涌入互联网,会对现有网络的容量和处理能力造成很大的挑战。若负责传感网与互联网连接的物联网网关,具有视频处理的能力,则可以大大减少带宽和处理压力。论文首先对物联网四个层次,感知层、网络层、支撑层以及应用层的关键技术、核心功能以及网关在此层中的作用进行了深入的研究。而后对传感网的网络结构、网络节点结构进行分析,在传感网角度对网关的分层结构进行了总结。论文工作中对嵌入式系统中使用的CPU芯片、视频处理芯片进行了详细的调研,并选择ARM系列CPU芯片作为网关系统的CPU芯片,ADV7183视频芯片作为网关系统的视频处理芯片。根据算选择的芯片的特点以及智能网络系统的功能,总结出了具有视频处理功能的智能物联网网关的硬件结构框图。论文工作中对嵌入式环境中使用的软件操作系统和启动引导器进行了深入的研究,最后选择Linux系统作为样机系统的操作系统,U-boot作为样机系统的启动引导器。在完成样机系统的搭建后,针对特定的视频处理需求,设计并实现了在网关中使用的高效的视频处理算法。在算法的基础上,实现了对应的应用程序。通过样机系统的运行测试表明,样机系统出色的完成了视频处理的功能。更多还原

【Abstract】 Along with society progress, multi-faced connection has become the main technology trend. The internet of things (IOT), so called next generation internet, has attracted more and more attention in a lot countries and businesses. IOT is composed of different wireless sensor networks, telecommunication transmit network and internet. Nowadays, video data occupy considerably ratio internet bandwidth, after the IOT coming, there will be more video data from sensor networks go into internet, then internet’s bandwidth and processing ability would face huge challenges. IOT gateway that responsible for connect sensor networks and internet, if it has the ability to process video data, would greatly reduce the bandwidth and network process stress.Firstly, this paper researched deeply on the four layers of IOT, perception layer, network layer, support layer and application layer. The research content includes key technologies, core functions and gateway’s role in these layers. Secondly, this paper detailed study the network structure of sensor network and the composition of sensor network nodes. From the view of sensor network, sum up the hierarchical structure of IOT gateway.Then, this paper research deeply on various CPUs, video process chip, software system and boot loader of embedded environment, and select ARM as main CPU, adv7183as video process chip, Linux as software system and u-boot as boot loader. Carry out detailed study on these selected technologies to implement the IOT gateway prototype system.After implement the prototype system, for the paricular application requirement, design and implement some image processing algorithms which could be applied in prototype system. And base on these algorithms, implement corresponding software. Through running test, the prototype system has done image processing tasks perfectly.更多还原