基于FLV格式视频的隐蔽通信系统

FLV格式视频是当今互联网上最为流行的流媒体文件格式,兼容多种视频编码格式并对其封装,针对这种网络FLV格式视频的认证技术,信息隐藏技术应运而生,设计和实现高安全性与强鲁棒性的视频隐蔽通信系统,保证特殊环境下秘密信息的隐蔽传递,是一项崭新而有意义的研究。因而解析了FLV格式的网络视频文件,研究其作为隐蔽通信载体的可能性和技术难点,并提出了一种基于H.264编码的能够抵抗如新浪播客网站各种处理操作的鲁棒视频隐写算法,构建了一个完整的网络视频隐蔽通信系统。     

基于3G的移动雷达车辆超速检测系统的设计与实现

随着国内车辆保有量的增加,交通管理部门的工作量也相应快速增加,针对现有车辆测速系统低速、低效、非实时的缺点,采用3G网络和雷达测速技术开发了一种新型的移动雷达车辆超速检测系统;通过3G网络进行测速数据的无线远程传输,借助第三方的认证服务器实现3G网络下的视频实时远程无线点播;使用固定和移动终端接入和访问技术,采取FLV视频编码格式,实现了测速视频信息的即时传送;最后经过实际使用测试,该测速系统运行稳定可靠,检测精度高,具有一定的实用性和推广价值。     

FLV视频的制作和转化

FLV是Adobe公司按照自己的标准创建的视频格式，所以，我们使用摄像机拍摄的节目并不能直接导出为FLV格式。要得到FLV格式的视频，需要先把拍摄的视频导出为其他格式，然后利用FLV的编码器把其他格式的视频转化为FLV格式。因此，制作一个FLV格式的视频一般可分为以下三步：①获取视频。     

FLV视频的制作和转化

FLV是Adobe公司按照自己的标准创建的视频格式,所以,我们使用摄像机拍摄的节目并不能直接导出为FLV格式.要得到FLV格式的视频,需要先把拍摄的视频导出为其他格式,然后利用FLV的编码器把其他格式的视频转化为FLV格式.     

基于HTTP协议的FLV流媒体的网络视频教学系统的设计

本文阐述FLV流媒体相对传统流媒体技术的优势，设计一个基于HTTP协议的FLV流媒体的网络视频教学系统，包括FLv流媒体的视频上传、格式自动转换、内容管理、和媒体播放等功能，重点分析其中的技术难点，并提出相应的解决方案。     

基于水印技术的隐蔽通信算法设计

本文研究了在音频信息上实现水印技术的难点与价值,分析和对比了利用音频信号进行信息隐藏的算法,探讨了隐蔽通信的编码策略,提出了一种基于混合模式的语音信号的信息隐藏编码算法。文中首先给出了编码过程中覆盖半径、覆盖编码等相关定义和信息隐藏编码的相关定理,从理论上分析了隐蔽通信编码策略的可行性和步骤;接着详细论证了该编码算法的基本原理、构造方法和算法的实现过程;然后以一段音频信息为例,阐述了隐蔽通信算法的实现方法和编码步骤;最后从算法的频谱分析、隐蔽信息嵌入量和听觉效果三个方面对算法性能进行测试。测试结果表明,算法隐蔽信息嵌入量可达2.1×103bps。     

联想i60手机

2008年的北京奥运盛会让视频手机大红大紫了一把,2009年视频手机势头不减。联想移动继08年新视界系列视频手机初体验之后,酝酿出让人惊叹的颠覆之作——联想i60手机。还在为寻找视频资源时面对RMVB、FLV格式无法播放而沮丧吗?联想i60业内首创多格式兼容手机,将RM、RMVB、FLV、AVI、MP4、3GP等所有主流网络电影格式海纳于小小的     

网络隐蔽信道关键技术研究综述

网络隐蔽信道是在网络环境下违反通信限制规则进行隐蔽信息传输的信息通道,为网络信息安全带来了新的挑战,也为数据传输的安全性和隐私性带来了新的研究方向.首先介绍了网络隐蔽信道的定义、分类、能力维度等基本概念;进而从码元设计、信息编码和信道优化这3个方面归纳分析了存储型和时间型两类网络隐蔽信道的构建技术,从隐蔽性、鲁棒性和传输效率这3个方面总结了网络隐蔽信道评估方法,从消除、限制、检测这3个方面梳理了网络隐蔽信道的对抗技术;最后,对未来的研究方向进行了展望.     

新软推荐

状元:疾风视频目前在国内外主流的视频网站播放的视频文件都是FLV格式的,由于这些网站对FLV视频的地址采用了特殊的加密方式,手动下载FLV文件会很麻烦。在线视频或多或少都会存在播放不流畅的问题,把视频下载到本地观看倒是不错,但对于FLV视频来说也只能干瞪眼。疾风视频是一款新兴的软件,它能神奇地加速视频,播放起来更流畅,欣赏效果更佳。运行软件后,打开任意一个视频网站观看节目,软件会自动对播放的视频节目加速,同时在节目列表中显示当前节目的文件大小和下载速度等信息,可以保存FLV视频,下载的视频保存在"我的文档\我的视频\JiFeng"文件夹中,还能充当一个管理工具。     

FLV分割合并好方便

如今网络上FLV格式的视频资源相当丰富,有时我们会将其下载到电脑中好好保存起来,但并不是每部短片都是那样精彩,假如自己想通过分割或者合并的方式,把FLV短片中出彩的部分单独截取或合并起来,又该怎么样来操作呢?其实很简单,借助"FLV编辑器"就能     

网站中FLV视频多种方式播放实现方法

FLV文件由于视频质量好、文件小、跨平台等优点,已成为互联网中在线播放的主流视频文件,越来越多的网站将FLV视频作为网站的主要内容。文章结合在业务网中FLV视频的开发过程,给出FLY视频播放以及用不同列表方式实现的方法。     

多媒体隐写研究进展

大数据分析可以跳过数据内容而仅从数据背景挖掘情报,传统的加密通信已经难以满足安全通信的需求。隐写技术是将秘密消息嵌入各种载体(如数字图像、音频、视频或文本)中实现隐蔽通信的技术,是应对大数据情报获取的有效手段,是密码技术的必要补充。人工智能,尤其是深度学习,在计算机视觉、语音和自然语言处理等领域的巨大成功,给隐写术带来了新机遇,提出了新挑战,促使基于图像、音/视频和文本的隐写术出现了一系列新思想、新方法。本文介绍隐写术的概念、分类、主要作用和研究意义,概述隐写术的发展历史、研究近况和应用场景。注意到各类载体上的隐写术虽然有差别,但是其核心追求有共通之处,可以提炼成通用的隐写编码问题。所以本文首先介绍隐写编码的基本思想与关键技术,然后针对最重要和流行的载体、图像、视频、音频和文本,分别介绍隐写术的进展。总体而言,本文从隐写编码、图像隐写、视频隐写、音频隐写和文本隐写5个方面概述隐写术的国际/国内发展现状,总结差异,对比优势和劣势,并分析发展趋势。     

A security enhanced robust audio steganography algorithm for image hiding using sample comparison in discrete wavelet transform domain and RSA encryption

Multimedia Tools and Applications - Steganography is the technique of hiding any secret information like text, image or video behind a cover file. Audio steganography is one of the widespread data...     

A practical design of high-volume steganography in digital video files

In this research, we consider exploiting the large volume of audio/video data streams in compressed video clips/files for effective steganography. By observing that most of the distributed video files employ H.264 Advanced Video Coding (AVC) and MPEG Advanced Audio Coding (AAC) for video/audio compression, we examine the coding features in these data streams to determine appropriate data for modification so that the reliable high-volume information hiding can be achieved. Such issues as the perceptual quality, compressed bit-stream length, payload of embedding, effectiveness of extraction and efficiency of execution will be taken into consideration. First, the effects of using different coding features are investigated separately and three embedding profiles, i.e. High, Medium and Low, which indicate the amount of payload, will then be presented. The High profile is used to embed the maximum amount of hidden information when the high payload is the only major concern in the target application. The Medium profile is recommended since it is designed to achieve a good balance among several requirements. The Low profile is an efficient implementation for faster information embedding. The performances of these three profiles are reported and the suggested Medium profile can hide more than 10% of the compressed video file size in common Flash Video (FLV) files.     

A survey on information hiding using video steganography

In the last few decades, information security has gained huge importance owing to the massive growth in digital communication; hence, driving steganography to the forefront for secure communication. Steganography is a practice of concealing information or message in covert communication which involves hiding the information in any multimedia file such as text, image, or video. Many contributions have been made in the domain of image steganography; however, due to the low embedding capacity and robustness of images; videos are gaining more attention of academic researchers. This paper aims to provide a qualitative as well as quantitative analysis of various video steganography techniques by highlighting their properties, challenges, pros, and cons. Moreover, different quality metrics for the evaluation of distinct steganography techniques have also been discussed. The paper also provides an overview of steganalysis attacks which are commonly employed to test the security of the steganography techniques. The experimental analysis of some of the prominent techniques using different quality metrics has also been done. This paper also presented a critical analysis driven from the literature and the experimental results. The primary objective of this paper is to help the beginners to understand the basic concepts of this research domain to initiate their research in this field. Further, the paper highlighted the real-life applications of video steganography and also suggested some future directions which require the attention of the research community.

     

大容量 MP3 比特流音频隐写算法

通过对MP3编解码算法原理的研究,提出了一种基于小值区哈夫曼编码特点的信息嵌入方法--码字映射替换规则,进而实现了一种能在MP3压缩文件的比特流中隐藏大量信息的盲检测隐写算法.算法先对载体mp3文件部分解码,搜索出适合嵌入的小值区码字,然后按规则修改比特流中的相应码字来嵌入秘密信息.实验结果表明,算法的容量高于MP3Stego,计算复杂度低,同时可保证不可感知性,并具有一定的不可检测性,能抵抗针对MP3Stego的隐写分析算法.     

A novel SPN-based video steganographic scheme using Sudoku puzzle for secured data hiding

Innovations in Systems and Software Engineering - Video steganography is the method of hiding the presence of data within the cover video. In this paper, a novel video steganography technique is...     

适用于高误比特率信道的鲁棒信息隐藏

提出不需要原始图文件比对即可提取出隐藏信息的方法。作法是应用扩频信息隐藏技术,选取部分隐藏位置与加入错误修正编码和交错器,强化信息隐藏的强度,以JPEG压缩破坏、随机信道破坏与图像分割等方式来验证。实验结果显示,在JPEG压缩品质为80%,压缩率为16倍时,提取隐藏信息的误比特率在6%以内;随机信道破坏的破坏率在15%时,误比特率在13%以内;图像分割1/2时,误比特率在13%以内。表明该方法能提高信息隐藏在高误比特率信道的鲁棒性。     

Current status and key issues in image steganography: A survey

Steganography and steganalysis are the prominent research fields in information hiding paradigm. Steganography is the science of invisible communication while steganalysis is the detection of steganography. Steganography means “covered writing” that hides the existence of the message itself. Digital steganography provides potential for private and secure communication that has become the necessity of most of the applications in today’s world. Various multimedia carriers such as audio, text, video, image can act as cover media to carry secret information. In this paper, we have focused only on image steganography. This article provides a review of fundamental concepts, evaluation measures and security aspects of steganography system, various spatial and transform domain embedding schemes. In addition, image quality metrics that can be used for evaluation of stego images and cover selection measures that provide additional security to embedding scheme are also highlighted. Current research trends and directions to improve on existing methods are suggested.