低比特率增长的可逆视频信息隐藏算法

发布时间：2018-02-08 16:41

本文关键词： 可逆视频信息隐藏 H.264/AVC 直方图平移矩阵编码混合编码比特率增长率 CAVLC熵编码　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着计算机和网络技术的快速发展,传统媒体逐渐地被数字媒体所取代。但是在数字多媒体技术使我们的生活越来越便捷的同时,却也带来了很多安全隐患,例如版权保护、非法窃取和恶意篡改等问题。信息隐藏技术的提出在一定程度上消除了数字多媒体的一些安全隐患,同时还开拓了诸如错误恢复,多媒体标签和秘密通信等领域的新方向。但是随着信息隐藏技术的不断发展,人们逐渐发现在一些领域中并不是所有的信息隐藏技术都能很好地应用到实际当中。为了更进一步提高信息隐藏技术在这些领域当中的性能,学术研究者提出了可逆信息隐藏技术,以弥补部分领域应用中的缺陷。数字视频作为多媒体的重要媒体形式之一,现已得到广泛应用,由于H.264/AVC视频编解码标准在数字视频的各个服务领域当中较为常见,本文针对这一标准进行了如下的研究工作:(1)针对H.264/AVC视频编解码标准中熵编码过程,本文提出了一种基于混合编码的低比特率增长可逆视频信息隐藏算法。该算法充分利用了 H.264/AVC视频编解码标准中CAVLC熵编码特性,结合传统的直方图平移和矩阵编码算法的思路,设计出一种混合编码算法,并针对P帧4×4小块的拖尾系数和非拖尾系数,分别使用直方图平移和混合编码算法嵌入秘密信息。混合编码算法在拖尾系数上的使用使得修改一个系数能够嵌入4比特秘密信息,降低了单位嵌入容量下系数的修改量,从而降低了含密视频的比特率增长率,同时提高了含密视频的视频质量。(2)利用CAVLC熵编码的特性,充分考虑DCT量化后系数的分布特点,设计出一种适用于拖尾系数的大容量可逆视频信息隐藏算法。该算法能够在4×4块的拖尾系数上进行多重嵌入,大幅度地提高了算法的嵌入容量,同时保证含密视频的比特率性能相较于现有算法依然具有一定的优势。
[Abstract]:With the rapid development of computer and network technology, traditional media are gradually replaced by digital media. But while digital multimedia technology makes our life more and more convenient, it also brings a lot of security risks, such as copyright protection. Problems such as illegal theft and malicious tampering. To some extent, information hiding technology has eliminated some security risks of digital multimedia, and has also opened up such problems as error recovery. New directions in the fields of multimedia tags and secret communications. But with the development of information hiding technology, People are gradually discovering that not all information hiding techniques can be applied to practice in some fields. In order to further improve the performance of information hiding technology in these fields, Researchers have put forward reversible information hiding technology to remedy the defects in some applications. Digital video, as one of the important media forms of multimedia, has been widely used. Because H.264 / AVC video coding and decoding standard is more common in various service fields of digital video, this paper has carried out the following research work on this standard: 1) Entropy coding process in H.264 / AVC video coding and decoding standard. In this paper, a low bit rate increasing reversible video information hiding algorithm based on hybrid coding is proposed. The algorithm makes full use of the CAVLC entropy coding characteristic of H.264 / AVC video coding standard and combines the traditional histogram translation and matrix coding algorithms. A hybrid coding algorithm is designed, and the trailing coefficients and non-trailing coefficients of P frame 4 脳 4 block are designed. Histogram translation and hybrid coding algorithms are used to embed secret information respectively. The use of hybrid coding algorithm in trailing coefficients enables the modification of a coefficient to embed 4 bits of secret information, thus reducing the amount of modification of coefficients under unit embedding capacity. Thus, the bit-rate growth rate of the encrypted video is reduced, and the video quality of the encrypted video is improved. (2) using the characteristics of CAVLC entropy coding, the distribution characteristics of the coefficients after DCT quantization are fully taken into account. A large capacity reversible video information hiding algorithm suitable for trailing coefficients is designed. The algorithm can be used to embed the trailing coefficients of 4 脳 4 blocks, which greatly improves the embedding capacity of the algorithm. At the same time, it still has some advantages over the existing algorithms to ensure the bit rate performance of dense video.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.81

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