【作者】 李继豪；

【导师】 向辉；

【作者基本信息】 山东大学 ， 计算机软件与理论， 2005， 硕士

【摘要】 目前在视频图像处理领域,视频数据的编码、压缩、加密、水印嵌入与传输等方面的研究和开发已经达到了相当高的水平,加上近年来兴起的流媒体技术,使得视频图像在互联网上的高质量实时传输已经成为了现实。 本论文以Visual C++6.0为平台,实现了几种常见的视频图像处理样式,包括视频图像的加密、视频图像的实时捕捉、压缩与保存以及视频格式的相互转换。 首先由一个密钥随机生成器(基于Visual C++6.0编程环境)生成一个密钥,然后在加解密密钥相同的情况下,对视频文件进行加密,不获得解密密钥用户就无法正常播放视频文件,较好地防止了非授权用户对视频文件的非法使用。 视频图像的实时捕捉、压缩与保存部分分别做了以下几种情况的实验:捕捉单帧未压缩视频图像和压缩视频图像、指定播放时间的多帧视频图像、限定帧数采用不同压缩格式的视频图像等。从中可以看出,未压缩和压缩图像文件容量大小相差几倍甚至上百倍之巨,要想实现网络视频图像的实时传输,就必须采用合适的压缩和存储格式,对视频图像进行合适比率的压缩。本文实现了几种常见视频文件格式的相互转换,对转换前后视频图像文件的大小进行了比较,提出了网络视频图像渐进传输的基本框架和实现构想,引用了一个支持YUV格式视频的实时回放工具,选择CIF(352×288)、QCIF(176×144)两种格式的视频文件进行了播放实验, 文章的最后,以Visual C++6.0为工具,以视频图像采集工具为媒介(实验中应用了摄像头),分别实现了局域网中点对点和Internet网络中客户机—更多还原

【Abstract】 The research and exploitation in encoding, compression, encryption, watermark embedding and transmission of video data has reached a high level in video image processing field today. Streaming media has also been the rage in recent years. High quality real-time transmission of video image on the web has come true today.In this thesis, we put forward several video image processing mode based on Visual C++6.0 including encoding, catching, compression, conservation of video image and conversion between video format.In video image encrypting part, a secret key is produced by a secret key random maker, and the video files are encrypted which the encrypting and decrypting key is same. The user can not play the video files normally unless he acquire the decrypting key, so we can prevent the video files from being visited by non-authorized users.Some experiments are done in video real-time catching, compressing and saving part, for example, catching single non-compressed and compressed video frame, many video frames which limit playing time, adopting different compressing format which limit the number of video frame. From above, the space of non-compressed video files is ten or hundred times as the compressed files. In order to realize real-time transmission of video image on the web, we must adopt appropriate compressing and saving format, and give an appropriate compressing ratio for video image. In this thesis, we give transform between several familiar video formats, put forward the radical frame and some ideas about video image real-time transmission on the web little by little, use a tool for real-time playing supporting YUV video format to do some playing experiments:one’ s format is CIF (352×288) , and the other’ s format is QCIF (176×144) .In the last part of this thesis ,we give two video image transmission systems on the web based on Visual C++6. 0 via the video image collecting tool (using a small video camera in the experiment), one is the same with point to point in the LAN, the other is based on client-server mode in the Internet.更多还原