数字电视信号传输安全防范系统研究
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摘要
近年来，非法攻击数字电视视频网络的事件时有发生。吉林省法轮功邪教组织攻击数字电视视频网络事件，台湾以及境外法轮功邪教组织攻击鑫诺二号卫星事件等等，都给国家和社会带来了恶劣的影响。数字电视信号传输安全防范系统的研究对确保安全播出和政令畅通有着极其重要的理论意义和实用价值。
本论文研究用于数字电视内容安全的视频网络防范技术，提出了一种新的数字电视信号传输安全防范系统架构。为减少需要嵌入的水印数据，提出了一种基于水印信息压缩的图像小波域水印算法，同时结合数字电视视频的压缩特点，提出了一种新的视频水印的嵌入方法，并应用于实际测试，达到了较好的结果。
本论文研究的主要内容主要包括以下三个方面：
（1）提出了一种基于水印信息压缩的图像小波域水印算法。通过细化处理和骨架缩放技术将水印图像浓缩，减少要加入的水印数据量。压缩后的水印利用置乱技术被嵌入到图像三级小波分解后的低频逼近系统LL3上，并可通过逆过程进行水印提取。仿真实验证明，该算法具有很好的不可见性和较强的鲁棒性，经滤波、噪声、图像压缩和剪切等攻击手段，仍然能较好地提取水印。
（2）提出了一种新的视频水印的嵌入方法。针对数字电视视频码流，将压缩后的水印嵌入到视频GOP的I帧不变化的区域。此种方法的优势在于，只在嵌入水印的过程中需要计算资源，嵌入水印后的数字电视视频码流在传输和播放过程中没有额外开支，不增加解码过程中的计算量，比较适合类似于机顶盒这样计算能力较弱的终端实现。又因为嵌入水印的区域是I帧中不变化的区域，GOP中后续的帧都是借助于该I帧来重建，所以后续的帧都可以检出水印。通过仿真实验，证明算法在保证嵌入水印具有很好的不可见的同时，很好的平衡了不可见性和计算支出的要求。
（3）提出了一种新的数字电视信号传输安全防范系统架构。该系统架构从数字电视信号源层面，采用强鲁棒性与脆弱性数字水印相结合的复合数字水印技术,能准确识别合法信号和非法信号,建立针对信号流本身的有效的安全防范技术。该系统架构实现了整个数字视频网络无盲点安全检测，当侦测到非法攻击时可实时切断非法信号源，可实时定位事故网络准确位置区域并自动报警。此外，文中建立的数字电视安全防范分级处置平台，可实现全天候实时应急响应。最后，在某地级市特定范围内实际环境中构建并实现了安全防范系统及相关模拟实验，验证了使用数字水印技术进行全环节视频网络防护的有效性和实用性。
In recent years, the events of illegally attacking video network of digital TVoften occurred. Events such as the attack on the digital TV video network carried outby Falun Gong cult of Jilin Province attacked the attack on Sinosat II satellite carriedout by Taiwan and other overseas Falun Gong cult and so on bring baneful influenceto the country and society. Research on digital TV signal’s transmission securitysystem has great theoretical significance and practical value on ensuring safebroadcast and that decisions can be carried out without fail.
This paper studies video network prevention technologies so as to realize thedigital TV content security and proposes a new security and prevention systemarchitecture for digital TV signal’s transmission. In order to reduce the amount ofembedded watermark data, we propose an image wavelet domain watermarkingalgorithm based on the compressed watermark information. Concerning with thecharacteristics of digital TV video compression, a novel video watermarkingembedded method is proposed and proved to have good effort through practical tests.
The main research content of this thesis is manifested in the following threeaspects:
(1) An image wavelet domain watermarking algorithm based on compressedwatermark information is proposed. The watermark image is concentrated throughthe refining process and skeleton scaling technology so that the amount of watermarkdata embedded is reduced. The compressed watermark is embedded into the lowfrequency approximation system LL3after three scales wavelet decomposition of theimage and can be extracted through the inverse process. Simulation experimentsshow that the embedded watermark in the algorithm has good invisibility and strongrobustness. The watermark can still be extracted after filtering attack, noise attack,image compression attack, shear attack and other attacks.
(2) A new video watermark method is proposed. For digital TV video, a newvideo watermark is compressed and embedded into the unchanged areas of I frame of the video GOP. This method only consumes calculating resources in theembedding process and does not incur extra expense during the transmission andbroadcast process of digital TV video stream. Such method does not increase theamount of computation in the decoding process and hence is more suitable forterminals with weak computing abilities such as STB. Since the region embeddedwatermark is the unchanged areas of I frame, all subsequent frames decode accordingto this I frame in the GOP and therefore we can detect watermark in all subsequentframes. Through simulation experiments, we prove that the algorithm ensures thatthe embedded watermark has good invisibility and balances the requirement betweenthe invisibility and the calculating expense.
(3) We propose a novel security and guard architecture for the transmission ofdigital TV signal. From the digital TV signal source perspective, the architectureadopts the composite watermark technology which utilizes strong robust watermarkand fragile digital watermark. The architecture can distinguish the legitimate signalfrom the illegal signal and provides effective security and guard technologies for thesignal flow. In the architecture no blind spots safety detection is realized in the wholedigital video network. When detecting illegal attacks, the architecture can cut off theillegal source in real time, accurately locate the accident network position and alarmautomatically. Furthermore, the digital TV security classification and disposalplatform established in the thesis can realize the all-weather real-time emergencyresponse. Finally, in the practical environment of a particular scope of a prefecture-level city, a secure and guard system and related simulations are built up and realized.It is proved that utilizing digital watermark technology to secure all processes ofvideo networks is effective and practical.
本论文研究用于数字电视内容安全的视频网络防范技术，提出了一种新的数字电视信号传输安全防范系统架构。为减少需要嵌入的水印数据，提出了一种基于水印信息压缩的图像小波域水印算法，同时结合数字电视视频的压缩特点，提出了一种新的视频水印的嵌入方法，并应用于实际测试，达到了较好的结果。
本论文研究的主要内容主要包括以下三个方面：
（1）提出了一种基于水印信息压缩的图像小波域水印算法。通过细化处理和骨架缩放技术将水印图像浓缩，减少要加入的水印数据量。压缩后的水印利用置乱技术被嵌入到图像三级小波分解后的低频逼近系统LL3上，并可通过逆过程进行水印提取。仿真实验证明，该算法具有很好的不可见性和较强的鲁棒性，经滤波、噪声、图像压缩和剪切等攻击手段，仍然能较好地提取水印。
（2）提出了一种新的视频水印的嵌入方法。针对数字电视视频码流，将压缩后的水印嵌入到视频GOP的I帧不变化的区域。此种方法的优势在于，只在嵌入水印的过程中需要计算资源，嵌入水印后的数字电视视频码流在传输和播放过程中没有额外开支，不增加解码过程中的计算量，比较适合类似于机顶盒这样计算能力较弱的终端实现。又因为嵌入水印的区域是I帧中不变化的区域，GOP中后续的帧都是借助于该I帧来重建，所以后续的帧都可以检出水印。通过仿真实验，证明算法在保证嵌入水印具有很好的不可见的同时，很好的平衡了不可见性和计算支出的要求。
（3）提出了一种新的数字电视信号传输安全防范系统架构。该系统架构从数字电视信号源层面，采用强鲁棒性与脆弱性数字水印相结合的复合数字水印技术,能准确识别合法信号和非法信号,建立针对信号流本身的有效的安全防范技术。该系统架构实现了整个数字视频网络无盲点安全检测，当侦测到非法攻击时可实时切断非法信号源，可实时定位事故网络准确位置区域并自动报警。此外，文中建立的数字电视安全防范分级处置平台，可实现全天候实时应急响应。最后，在某地级市特定范围内实际环境中构建并实现了安全防范系统及相关模拟实验，验证了使用数字水印技术进行全环节视频网络防护的有效性和实用性。
In recent years, the events of illegally attacking video network of digital TVoften occurred. Events such as the attack on the digital TV video network carried outby Falun Gong cult of Jilin Province attacked the attack on Sinosat II satellite carriedout by Taiwan and other overseas Falun Gong cult and so on bring baneful influenceto the country and society. Research on digital TV signal’s transmission securitysystem has great theoretical significance and practical value on ensuring safebroadcast and that decisions can be carried out without fail.
This paper studies video network prevention technologies so as to realize thedigital TV content security and proposes a new security and prevention systemarchitecture for digital TV signal’s transmission. In order to reduce the amount ofembedded watermark data, we propose an image wavelet domain watermarkingalgorithm based on the compressed watermark information. Concerning with thecharacteristics of digital TV video compression, a novel video watermarkingembedded method is proposed and proved to have good effort through practical tests.
The main research content of this thesis is manifested in the following threeaspects:
(1) An image wavelet domain watermarking algorithm based on compressedwatermark information is proposed. The watermark image is concentrated throughthe refining process and skeleton scaling technology so that the amount of watermarkdata embedded is reduced. The compressed watermark is embedded into the lowfrequency approximation system LL3after three scales wavelet decomposition of theimage and can be extracted through the inverse process. Simulation experimentsshow that the embedded watermark in the algorithm has good invisibility and strongrobustness. The watermark can still be extracted after filtering attack, noise attack,image compression attack, shear attack and other attacks.
(2) A new video watermark method is proposed. For digital TV video, a newvideo watermark is compressed and embedded into the unchanged areas of I frame of the video GOP. This method only consumes calculating resources in theembedding process and does not incur extra expense during the transmission andbroadcast process of digital TV video stream. Such method does not increase theamount of computation in the decoding process and hence is more suitable forterminals with weak computing abilities such as STB. Since the region embeddedwatermark is the unchanged areas of I frame, all subsequent frames decode accordingto this I frame in the GOP and therefore we can detect watermark in all subsequentframes. Through simulation experiments, we prove that the algorithm ensures thatthe embedded watermark has good invisibility and balances the requirement betweenthe invisibility and the calculating expense.
(3) We propose a novel security and guard architecture for the transmission ofdigital TV signal. From the digital TV signal source perspective, the architectureadopts the composite watermark technology which utilizes strong robust watermarkand fragile digital watermark. The architecture can distinguish the legitimate signalfrom the illegal signal and provides effective security and guard technologies for thesignal flow. In the architecture no blind spots safety detection is realized in the wholedigital video network. When detecting illegal attacks, the architecture can cut off theillegal source in real time, accurately locate the accident network position and alarmautomatically. Furthermore, the digital TV security classification and disposalplatform established in the thesis can realize the all-weather real-time emergencyresponse. Finally, in the practical environment of a particular scope of a prefecture-level city, a secure and guard system and related simulations are built up and realized.It is proved that utilizing digital watermark technology to secure all processes ofvideo networks is effective and practical.
引文
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