Image processing system is a very important part of mini unmanned helicopter , which mainly dealing with how to detect the object and supply the navigation computer with location information of the object . however , the varied background and the moving of the camera make the image processing become difficult . to solve these problems , this thesis introduces an object detection algorithm based on contour retrieving , template match and hu moments invariant 硬件组成详细探讨了系统结构，并对所采用的ccd摄像机、视频采集卡等硬件单元作了描述；在软件设计中，首先对不同操作系统环境下的视频捕获做了讨论；接着，重点研究了针对机载摄像机拍摄图像的目标检测方法，提出并实现了基于模板匹配和不变矩的目标检测算法，以及基于机器学习的目标检测算法。
The characteristic and key technologies of the system are as follows : ( 1 ) in realizing the live broadcast of audio and video , the problem of immense multimedia data and low networks bandwidth utilization ratio is solved by using mpeg - 4 as format of audio and video data . audio and video data are collected by video card cv500 which developed by beijing sum tone company ; meanwhile , the contradictory between the delay of networks transmitting and the quality of the image is well solved by setting a " bi - buffer area " 系统实现中解决的关键问题和特色主要有以下几个方面： ( 1 )在视音频直播功能的实现中，通过使用北京算通公司的cv500视频采集卡和cv500sdk进行视音频数据采集，并采用当今最新的图像和语音编码压缩标准mpeg - 4作为视音频数据的采集格式，既保证了图像的质量，又大大缩减了视音频所占的带宽，从而解决了多媒体数据量大、网络带宽利用率低的问题；同时，通过设置环形缓冲区的办法来调和网络传输延时与图像质量之间的矛盾，取得了较好的效果。
First , the system converts the received tv program signals into mpeg file with video capture card , cut the mpeg file into several short mpeg files according to the content of the program and establish index for them . then , it transports the short mpeg files to jukebox server . the jukebox server with responsibility for discs management , it record the program material into discs and provide service for clients visit the program online 系统将接收到的卫星电视信号通过视频采集卡，把它采集成mpeg文件，再根据节目内容将mpeg文件分段成小的节目素材文件并建立检索索引，然后将它传递到光盘库服务器；光盘库服务器负责光盘的管理，它一方面将节目素材文件刻录到光盘上，另一方面为客户机提供在线访问服务；客户端根据一定检索条件进行检索，获得所需的节目素材文件，并下载到本地，本地的媒体编辑软件直接对mpeg文件进行编辑，生成新的节目。
