【作者】 魏峰；

【导师】 李庆武；

【作者基本信息】 河海大学 ， 通信与信息系统， 2007， 硕士

【摘要】 嵌入式系统是现今国际上IT领域的一个热门研究方向。因其快速的数据处理能力和良好的控制与网络性能，在信息领域中倍受青睐，得到了广泛的应用与发展。研究嵌入式系统的新方法、新应用具有重要的理论意义和实用价值。 本文详细介绍了基于嵌入式Linux的船舶监控系统的软、硬件设计，以及实验平台开发环境的设置，并对经过传输的含噪图像进行初步处理。 硬件设计方面主要是对ARM芯片进行分析、搭建嵌入式电路所需要的最小系统，而开发环境则是在开发板上建立Bootloader、JFFS2文件系统和经过裁剪过的Linux2.4内核。 软件设计中，驱动部分主要集中在I~2C驱动的编写，通过完成I~2C设备的注册和初始化等内容，实现和内核、设备之间的交互操作，使用户空间和内核空间自由地传递数据；图像采集部分则是利用CMOS摄像头进行船舶图像采集，并由video4Linux的有关算法来完成软件实现，然后对采集到的图像则进行JPEG压缩和处理，以便于进行网络传输；船舶图像传送部分，则是利用Socket相关函数来完成。对于传输后的含噪图像，采用小波分析方法对其进行初步处理，以便于对图像进行分析。 本论文主要对有关的JFFS2文件系统的改进进行了一定深入的研究，所设计的监控系统具有成本低、体积小、功耗低等特点，对于航运管理有较好的实用价值，也可以用于其它图像监控领域。更多还原

【Abstract】 Because of the fast data processing ,control and network capacity .Embedded System is an popular research fields in IT . It has a good performance in the field of information, gets a wide range of applications and development, and it has achieved great success. It’s significant to study new methods and new application for embedded system.In this paper, the design of software and hardware of a vessel monitoring system based on embedded Linux and installation of the environment of the development platform, and processing of the noisy images after transmission are introduced in detail.Hardware design is the minimum structures of embedded circuit system required. The development environment is compose of the Boot loader, the JFFS2 file system and Linux kernel 2.6 cutted in the Development Board are established, and it may operate the code.The design of driver software focuses on I~2C. Through the completion of the registration and initialization, of I~2C equipment the interactive operation between the equipments and the core is achieved, and to make data transmit freely between the user space and kernel space; in the part of image acquisition CMOS camera is used acquire of the ship, and the software algorithm is completed by video4Linux, then the image is processed and compressed by JPEG. To transmit through network, socket functions are used to transmit the image of ship. For those noisy images, the wavelet theory is taken to preliminarily process for the next analysis for the image.In this paper, improvement for the JFFS2 file system is researched in certain depth. The monitoring has characteristic of low cost, small size, low power consumption, and it not only has some practical value for those ship management, but also could be applied to other image monitoring system.更多还原