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1、II Study of an Embedded Image Monitoring System Based on ARM Discipline: Control theory and control engineering Student signature: Supervisor signature: ABSTRACT With the rapid evolution of digital image, embedded computer and communication technique, embedded image monitoring system becomes a new r
2、esearching interest. However, a large number of pointless pictures are transmitted back to the monitoring center, which increases communication quantity and surveillance load; generally, the images definition in remote surveillance is low because of its limited transmission channel. An improving way
3、 is moving object detection in the front of system, and snatching a high definition picture when motion happens and then transferring back to the monitoring center. This method can settle the contradiction between definition and transferring speed. In the dissertation, a kind of embedded image monit
4、oring system based on ARM is discussed. The system has the functions of motion detection and picture transmission based on GPRS, and improves the flexibility of setting and the definition of abnormal picture. The system takes LPC2210 based on ARM7 core as its central processor, and embedded OS C/OS-
5、II as its software platform. Moving object detection adopts a method of dynamic difference background image, whose principle is to calculate difference picture among the current frames and background images and take the motion adjudging threshold which owns maximum information entropy to determine m
6、oving area; and dynamically updates background by using Kalman filter. Thus, the system realizes the judgment of the moving area under the complicated changing background. The monitoring system adopts embedded Web server technology to send warning information and on-the-spot picture to the remote mo
7、nitoring center. The wired or wireless remote transmission channel (Ethernet or GPRS) can be adopted between the center and the front control point, and has the features of mutual supplement, convenience and flexibility. And GPRS communication terminal adopts Wavecom wireless module to transmit moni
8、toring image through wireless common network. In the dissertation, the principle and implementation of embedded image monitoring system based on ARM are discussed. Experimental results show that the implemented system performs well in accurately detecting motion and low-level FAR；and the GPRS IIItra
9、nsmission is so steady that the shutdown moment is few. Meanwhile, the realization of the image monitoring system provide a initial platform for the subsequent research, such as object sorting, object tracking, remote transmitting, scene controlling etc. Key Words: image monitoring; embedded system;
10、 ARM; C/OS-II; motion detection; TCP/IP; GPRS; embedded web server I基于 ARM 的嵌入式图像监控系统研究 学科：控制理论与控制工程 研究生签字： 指导教师签字： 摘 要 随着数字图像技术、嵌入式计算机技术和通信技术的飞速发展，嵌入式图像监控系统己成为当今监控领域的一个新的研究热点。然而，大量无意义画面的回传在增加通信量的同时，并没有减轻监控图像判读的工作量；而受有效传输速率的限制，远程图像监控系统的清晰度一般较低。在前端对图像进行运动检测和分析，并在符合规则时抓拍高清晰度图片传回监控中心，可有效解决清晰度和传输速率间的矛盾。
11、本文提出了一种基于 ARM 的嵌入式图像监控系统，它在前端实现了运动检测，并采用 GPRS无线信道进行远程图像传输，提高了监控系统的布站灵活性和特异图像的清晰度。 系统以基于 ARM7 内核的嵌入式微处理器 LPC2210 为核心，嵌入式实时操作系统C/OS-II 作为软件开发平台。运动目标检测采用动态差分背景图像法，其原理是利用序列图像中当前帧图像减去背景图像，并采用使信息熵最大化的运动判决门限判定运动区域；采用 Kalman 滤波动态背景生成实现了背景的动态更新；从而实现了复杂变化背景下图像运动区域的判决。监控系统采用嵌入式 Web 服务器技术将报警信息及现场图像发送至远程监控中心；中心与
12、前端监控点间可以采用有线（以太网）或无线（GPRS）的远程传输信道，这两种传输方式具有互相弥补、方便灵活的特点。远程传输采用 GPRS 通用无线分组协议，并采用 Wavecom 通信模块实现了利用现有的无线公网传输实时远程监控图像。 文中给出了系统设计及实现的全过程。实验结果表明，所提出的运动检测算法具有较高的检出率和较低的虚警率；所实现的 GPRS 传输运行可靠、掉线率较低。同时，该图像监控系统的实现也为后继的目标分类、目标跟踪、远程传输和对现场的控制等研究工作，提供了一个初步的平台。 关键词：图像监控；嵌入式系统；ARM；C/OS-II；运动检测；TCP/IP；GPRS； 嵌入式 Web 服务器 ii4.4.2 运动目标检测实验 . 39 5 ETHERNET 的图像传输.41 5.1 嵌入式 TCP/IP 协议栈 .41 5.1.1 ZLG/IP 简介47. 41 5.1.2 ZLG/IP 的 Socket API 函数介绍. 43 5.2 嵌入式 WEB服务器.45 5.2.1 HTTP 协议简介48. 45 5.2.2 嵌入式 Web 服务器设计 . 46 5.2.3 HTML 网页设计.
