文档介绍：第 I 页基于差值分析的视频隐写分析摘要 信息隐藏技术是一门关于信息隐藏的技巧与科学, 所谓信息隐藏指的是不让指定的接收者之外的任何人意识到信息的传递事件或者信息的内容。隐写分析主要是针对图像、视频、声音等多媒体数据, 在对隐写算法和隐藏信息一无所知的情况下, 仅仅通过分析多媒体数据,检测其否含有隐藏信息。 随着网络的发展,尤其是视频网站的广泛使用,多媒体数据(如土豆、youtube 等)在互联网上大量存在,使得隐写术分析技术的任务相当艰巨。 本文提出一种被动隐写分析方法, 来检测视频中是否携带隐藏信息,并利用开源的MPEG 视频文件编解码库ffmpeg,对实际视频进行了分析实验,实验结果表明, 对于不同的视频对象和水印嵌入率,本算法都可有效检测到隐藏信息。算法和实验的具体内容如下: 本文提出的被动隐写分析算法: 基于差值分析的视频隐写分析算法。首先,使用改进后的中值滤波算法对视频文件I 帧进行处理;然后,对滤波前后I 帧数据的变化进行统计;根据统计结果,使用相应的差值分析方法计算视频文件中是否含有隐藏信息。文中还通过实验观察不同嵌入强度和不同嵌入率对差值分析结果的影响, 进而找到被第 II 页动隐写分析算法的有效检测范围。当嵌入强度大于 6 或嵌入率大于 8%时,差值分析方法能有效的检测出带有隐藏信息的文件。 关键词: 隐写分析,隐写术,MPEG,差值分析,ffmpeg 第 III 页 Video Steganalysis Based on Difference Analysis ABSTRACT Steganography is the ar t and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the messag e, a form of security through obscurity. Steganalysis is mainly di rected against images, video, sound and other multimedia data. Simply by analyzing the multimedia data to detect if it contains hidden info rmation without a ny knowledge about steganographic algorithm a nd hidden information. With the development work, es pecially the widely used of video site (such as tudou, youtube), multimedia is everywhere in work, it makes steganalysis became a hard and emergency job. Propose a base frame difference steganalysis method to detect the hidden information in multimedia data . Implementing video steganalysis based on MPEG format video files c odec library ffmpeg. Results show this method is ess under differen t multimedia data and different embedding rate. The following is a bout algorithm and experimental. In this paper, we propose a passive steganalysis: video steganalysis based on difference analysis. First, we use median filter to process the 第 IV 页 I-frame of the video file. Second, count the information change of I-frame before and after median filter, and judge if the video file contain hidden inf