论文总字数：18765字

摘 要

随着现在社会信息化的节奏越来越快，许多领域中都需要监控系统的应用，比如车内监控、电梯监控等。以前，许多领域都是使用有线传输模式进行监控，因为它传输速率很快但是成本太高，局限性太大。现在随着无线技术的普及，越来越多的地方开始使用无线传输模式进行监控，它克服了有线模式的所有缺点并且移动十分便捷也具有优秀的开发前景。

本文设计的是一种基于STM32和WIFI的监控视频传输系统，通过摄像头采集图像并通过WIFI将图像传输到终端，利用图像采集现场建立有效的通信，实现了视频的无线传输以及电脑终端对现场的监控。本系统采用STM32F103作为微处理器芯片。现场图像采集选用CMOS摄像头OV2640,WIFI传输电路是由一款支持IEEE802.11g/b标准的无线芯片Marvell88W8686实现。

综上所述，论文完成硬件与软件的设计工作，实验结果表明：此系统能够顺利的捕捉图像并且流畅的通过WIFI将视频传输到终端上显示。

关键字：无线技术 STM32 WIFI

Monitor video transmission system based on STM32 and WIFI

Abstract

With the pace of Social informatization getting faster and faster, many area need application of monitoring system such as car monitoring, elevator monitoring and so on. In the past, many areas were using wired transmission mode for monitoring because of the high speed of transmission, but the cost was too high and the limitations were too large. Now with the popularity of wireless technology, more and more area begin to use the wireless transmission mode to monitor, it overcomes all the disadvantage of the wired model and easy to move and has excellent prospects for development.

This paper designs a Monitor video transmission system based on STM32 and WIFI, collects the image through the camera and transmits it to the terminal through WIFI. It establishes the effective communication through the image collection, realizes the wireless transmission of the video and the monitoring to the scene through terminal. STM32 is used as the system’s microprocessor chip . Collection of image uses CMOS camera OV2640. The Marvell 88W8686 chip is used for WIFI transmission, which bases on IEEE802.11g/b standard .

As is mentioned above, the paper completes the hardware and software design work, the experimental results show that: the system can capture the image successfully and can transmits the video to the terminal thorugh WIFI smoothly.

Keywords: wireless technology;STM32;WIFI

目 录

摘要………………………………………………………………………………………………I

ABSTRACT……………………………………………………………………………………II

第一章绪论…………………………………………………………………………………1

1.1课题研究的背景和意义…………………………………………………………………1

l.1.1课题研究的背景…………………………………………………………………1

1.1.2课题研宄的意义………………………………………………………………2

1.2国内外研究现状和趋势……………………………………………………………………2

1.2.1视频传输系统的现状和发展趋势………………………………………………2

1.2.2 WIFI在视频传输系统中的研究现状………………………………………………2

1.3论文主要内容…………………………………………………………………………2

第二章系统硬件设计……………………………………………………………………3

2.1系统硬件方案的设计……………………………………………………………………3

2.2系统各部分器件的选择……………………………………………………………………3

2.2.1系统的主控制芯片……………………………………………………………………3

2.2.2图像采集CMOS摄像头…………………………………………………………………4

2.2.3WIFI芯片的选择……………………………………………………………………4

2.3硬件电路的设计…………………………………………………………………………5

2.2.1硬件原理图的设计……………………………………………………………………5

2.3.2硬件PCB的设计………………………………………………………………………8

2.4本章小结……………………………………………………………………………………8

第三章系统软件设计……………………………………………………………………10

3.1系统软件方案的设计……………………………………………………………………10

3.1.1系统的软件结构的设计………………………………………………………………10

3.1.2系统软件工作流程的设计…………………………………………………………10

3.2图像采集的程序设计……………………………………………………………………11

3.2.1SCCB总线………………………………………………………………………………11

3.2.2 OV2640输出数据的时序分析…………………………………………………………12

3.2.3图像数据的采集和读取………………………………………………………………14

3.3图像的压缩和解码…………………………………………………………………………14

3.3.1图像的色彩空间模型…………………………………………………………………14

3.3.2图像JPEG压缩的原理…………………………………………………………………15

3.4 WIFI传输和显示程序的设计………………………………………………………………16

3.4.1 SDIO协议简介…………………………………………………………………………16 3.4.2 LwIP协议栈的介绍…………………………………………………………………18

3.4.3 LwIP协议栈的移植……………………………………………………………………18

3.5终端显示程序的设计……………………………………………………………………20

3.6本章小结……………………………………………………………………………………21

第四章系统运行的情况和分析………………………………………………………………22

4.1监控上位机的显示界面……………………………………………………………………22

4.2本章小结……………………………………………………………………………………22

第五章总结与展望…………………………………………………………………………23

5.1总结………………………………………………………………………………………23

5.2展望…………………………………………………………………………………………23

参考文献……………………………………………………………………………………24

致谢…………………………………………………………………………………………25

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