武汉理工大学硕士学位论文
摘 要
随着计算机软件、硬件技术日新月异的发展和普及,基于多媒体技术的监控
系统在视觉监视领域发挥着越来越重要的作用。如今,许多企业都希望利用监控
系统实现机房、厂房的无人值守以及防火防盗的自动化、智能化。特别在银行金
库、军用仓库等重要场所,可靠性好、智能化程度高的监控系统具有很大的需求
市场。现存的视频监控系统主要由工控机和视频图像采集卡构成,存在系统稳定
性差、价格高昂等缺点。本文设计了一种基于嵌入式的无线图像监控系统,系统
以ARM作为核心处理器,通过高速视频解码电路完成对模拟视频信号的数字化
采集、压缩并通过GPRS发送报警信息。
本文首先提出了该图像监控系统的总体设计方案和框架结构,然后确定了图
像采集和压缩的实现方案,根据报警的实时性要求,采用了GPRS方式对报警图
像信息进行传输,并对图像的采集、压缩以及传输的设计中用到的一些技术原理
和协议做一些简要地介绍与分析。
其次,本文对硬件的重要组成部分如视频信号的采集、压缩存储和传输等进
行了重点讨论。本设计以嵌入式处理器Philips公司ARM7系列的LPC2214为核
心,采用了集成视频处理芯片SAA7111A,专用图像压缩芯片ZR36060. CPLD
逻辑器件以及GPRS模块BENQ 22来实现系统的各部分功能。
再者,本文完成了对实时操作系统uGOS- 11在本系统中的移植,设计了系
统软件的总体设计流程,并实现软件设计的模块化。接下逐一完成了来对各个模
块的初始化配置以及CPLD的逻辑编程,并完成系统的调试。
最后,对系统的关键性问题— 图像报警和短信彩信处理分别进行了详尽的
说明。在图像报警的问题上,采用了被动红外探测与运动视频检测算法相结合的
方法,克服了图像报警的可靠性不高、易受外界环境干扰的缺点。同时,对短信
及彩信的处理方法进行了说明,给出了发送失败后的处理方法。
关键词:ARM; GPRS:图像报警:被动红外探测;运动检测算法
武汉理工大学硕士学位论文
ABSTRACT
With the development and prevalence of computer software and hardware
technology, monitoring system based on multimedia technology has played a more
and more important role in the video monitoring field. Especially in the important
locale such as bank, cashbox and military storage, the reliable and intelligentized
monitoring system has heavy demand market. Most of video monitoring systems on
the market are composed of industrial control computer which work unstably, and the
price is too high. In order to get ride of these defects, in this paper we design a new
system based on digital signal processor. The system based on the core processor
LPC2214 accomplish the digital gather of analog video signal through high speeding
video decode circuit.
This context first puts forward the whole structure and design method of the
system, then, make sure the project of the image digitize and compress, analyses some
basic theories that the system has involved, after that, introduces the method of the
alarm image's transport一 GPRS.
Complete the hardware design of the system. Video gather part include video
input and output, the design adopt the integrated video chip SAA7111A to realize the
signal conversion of analog video input signal, it adopt the I2 C bus as programming
interface of the device.Under the help of CPLD, the system use SAA7111A to digitize
the image and compressing it by ZR36060. The system sends the compressed image
to the user or surveillance center by GPRS, and then save the data in the SDRSM
provide to the user.
Complete the software design of the system. First, add the real time opration
system uC/OS- II to the system in order to realize modularize of the software design.
Then, given the whole design of the system and initialize every module to make sure
they work well.
On the pivotal problem of system 一 dealing with the MMS and image
alarm,the text has explained in details. We take the method of passive infared
detection and moving video detection arithmetic to solve the problem of image alarm.
Also, we give the way to avoid the failure of sending MMS.
Key words: ARM; GPRS;
detection arithmetic
image
alarm; passive infared detection; moving video
评论0