视频水印算法及其在广播电视业务中的应用
发布时间：2018-12-08 11:45
【摘要】：当今社会,随着信息技术和计算机网络的迅猛发展,使得文本、图像、视频、音频等数字产品也日益丰富。数字作品的易于无损复制、分发的特性,使得出于各种目的的盗版行为日益猖獗,给信息安全和数字产品的保护带来一些问题,这就使得数字产品的版权问题成了亟待解决的问题。数字水印技术就是在这种背景下发展起来的,它是通过某种算法将特定的版权信息嵌入到数字作品中来证明作品的版权所有,它弥补了传统加密技术的不足,已经成为多媒体信号处理领域中的一个研究热点。在此,本文主要就视频水印技术及其应用的相关情况进行探讨。 相对于静止图像水印,对视频水印的研究起步比较晚,但视频水印研究是目前水印技术研究方向上的一个热点和难点。目前的很多视频水印算法在鲁棒性方面取得了不错的效果,但其代价就是复杂的水印嵌入和提取过程,都没有将水印算法的研究与实际应用结合起来。本文所在的工作就是针对视频水印在广播电视领域的应用,提出了切实可行的水印算法,同时将算法和应用结合起来进行研究和模拟实验。针对上述内容,本论文主要做了如下工作： 1、基于离散小波变换的视频水印算法研究 提出了两种视频水印算法,分别基于一维小波变换和基于三维小波变换。一维小波变换的算法选择了低频域进行水印嵌入,而三维小波变换的算法选择了中低频域进行水印嵌入,水印算法均能实现盲提取。这两种算法有效地降低算法复杂度,能够满足实际系统中实时性的要求,同时对常见的视频处理手段具有良好的鲁棒性,如MEPG-2编码、加噪、帧置换等。 2、WDRM系统的开发 设计了一种基于视频水印技术的DRM系统,主要应用于数字电视业务。采用条件接收技术来控制用户授权,包括收看、录制等操作；水印技术实现版权保护,以弥补条件接收技术的不足。在系统的前端,电视节目传输之前要嵌入标识有版权信息的水印,当电视节目被盗播时可用来证明版权所有；在系统的终端,用户在录制节目时要嵌入唯一标识有用户身份的PDK,当录制后的节目被非法传播时可用来追查相应的非法用户。 3、电视节目监控系统的开发 在电视节目流中嵌入水印,通过提取的水印信息和TS流信息表中的相关信息来实现收视率调查的统计。在广告视频制作好以后嵌入水印,在广播监控设备中通过水印的检测情况来判断广告是否按照要求播出。设计的广告监控软件,通过对节目流相关信息的提取,可方便地观测节目流中广告的状态,实现了广告监控的模拟。
[Abstract]:Nowadays, with the rapid development of information technology and computer network, digital products such as text, image, video and audio are becoming more and more abundant. The easy and lossless reproduction and distribution of digital works make piracy for various purposes increasingly rampant, causing problems for information security and the protection of digital products. This makes the copyright problem of digital products become an urgent problem to be solved. Digital watermarking technology is developed in this context, it is a certain algorithm to embed specific copyright information into digital works to prove the copyright of the work, it makes up for the shortcomings of traditional encryption technology. It has become a research hotspot in the field of multimedia signal processing. In this paper, the video watermarking technology and its applications are discussed. Compared with the still image watermarking, the research on video watermarking is relatively late, but the research of video watermarking is a hot and difficult point in the current research direction of watermarking technology. At present, many video watermarking algorithms have achieved good results in terms of robustness, but the cost is the complex watermark embedding and extraction process, which does not combine the research of watermarking algorithm with the practical application. Aiming at the application of video watermarking in the field of radio and television, this paper puts forward a feasible watermarking algorithm, and combines the algorithm with the application to carry on the research and the simulation experiment. The main work of this paper is as follows: 1. Two video watermarking algorithms based on discrete wavelet transform (DWT) are proposed, which are based on one-dimensional wavelet transform and three-dimensional wavelet transform respectively. The algorithm of one-dimensional wavelet transform selects low-frequency domain to embed the watermark, while the algorithm of three-dimensional wavelet transform chooses the low-frequency domain to embed the watermark, and the watermark algorithm can achieve blind extraction. These two algorithms can effectively reduce the complexity of the algorithm and can meet the real-time requirements of the actual system. At the same time, they have good robustness to common video processing methods, such as MEPG-2 coding, adding noise, frame permutation and so on. This paper presents a DRM system based on video watermarking technology, which is mainly used in digital TV service. Conditional access technology is used to control user authorization, including watching, recording and other operations; watermarking technology to achieve copyright protection to compensate for the lack of conditional access technology. In the front end of the system, the watermark marked with copyright information should be embedded before the TV program is transmitted. When the TV program is stolen and broadcast, it can be used to prove the copyright. At the end of the system, the user needs to embed a unique PDK, that identifies the user when recording the program. When the recorded program is spread illegally, it can be used to trace the corresponding illegal user. 3. The development of TV program monitoring system embedded watermark in TV program stream, and realized the statistics of ratings investigation by extracting watermark information and relevant information in TS stream information table. After the advertisement video is made, the watermark is embedded, and the watermark is detected in the broadcast monitoring device to determine whether the advertisement is broadcast according to the requirement. By extracting the relevant information of the program flow, the advertisement monitoring software can conveniently observe the status of the advertisement in the program flow and realize the simulation of the advertisement monitoring.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TP309.7;TN94
本文编号：2368291
[Abstract]:Nowadays, with the rapid development of information technology and computer network, digital products such as text, image, video and audio are becoming more and more abundant. The easy and lossless reproduction and distribution of digital works make piracy for various purposes increasingly rampant, causing problems for information security and the protection of digital products. This makes the copyright problem of digital products become an urgent problem to be solved. Digital watermarking technology is developed in this context, it is a certain algorithm to embed specific copyright information into digital works to prove the copyright of the work, it makes up for the shortcomings of traditional encryption technology. It has become a research hotspot in the field of multimedia signal processing. In this paper, the video watermarking technology and its applications are discussed. Compared with the still image watermarking, the research on video watermarking is relatively late, but the research of video watermarking is a hot and difficult point in the current research direction of watermarking technology. At present, many video watermarking algorithms have achieved good results in terms of robustness, but the cost is the complex watermark embedding and extraction process, which does not combine the research of watermarking algorithm with the practical application. Aiming at the application of video watermarking in the field of radio and television, this paper puts forward a feasible watermarking algorithm, and combines the algorithm with the application to carry on the research and the simulation experiment. The main work of this paper is as follows: 1. Two video watermarking algorithms based on discrete wavelet transform (DWT) are proposed, which are based on one-dimensional wavelet transform and three-dimensional wavelet transform respectively. The algorithm of one-dimensional wavelet transform selects low-frequency domain to embed the watermark, while the algorithm of three-dimensional wavelet transform chooses the low-frequency domain to embed the watermark, and the watermark algorithm can achieve blind extraction. These two algorithms can effectively reduce the complexity of the algorithm and can meet the real-time requirements of the actual system. At the same time, they have good robustness to common video processing methods, such as MEPG-2 coding, adding noise, frame permutation and so on. This paper presents a DRM system based on video watermarking technology, which is mainly used in digital TV service. Conditional access technology is used to control user authorization, including watching, recording and other operations; watermarking technology to achieve copyright protection to compensate for the lack of conditional access technology. In the front end of the system, the watermark marked with copyright information should be embedded before the TV program is transmitted. When the TV program is stolen and broadcast, it can be used to prove the copyright. At the end of the system, the user needs to embed a unique PDK, that identifies the user when recording the program. When the recorded program is spread illegally, it can be used to trace the corresponding illegal user. 3. The development of TV program monitoring system embedded watermark in TV program stream, and realized the statistics of ratings investigation by extracting watermark information and relevant information in TS stream information table. After the advertisement video is made, the watermark is embedded, and the watermark is detected in the broadcast monitoring device to determine whether the advertisement is broadcast according to the requirement. By extracting the relevant information of the program flow, the advertisement monitoring software can conveniently observe the status of the advertisement in the program flow and realize the simulation of the advertisement monitoring.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TP309.7;TN94
【引证文献】
相关期刊论文 前1条
1 李静;;一种应用于广播监视的视频水印方案[J];电脑知识与技术;2013年13期
相关硕士学位论文 前1条
1 肖芸;DRM技术在数字出版中的应用研究[D];杭州电子科技大学;2013年
，本文编号：2368291
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