视频主动防伪系统的研究与构建.pdfVIP

中文摘要 当前，视频监控系统在社会各界广泛运用，对预防、震慑、打击犯罪发挥了 非常重要的作用，视频录像监控系统也是现代化的“打、防、控”一体化的治安 管理机制的重要构成部分。公安机关执法过程中，视频监控已经成为一种极为有 效的破案辅助工具，极大地提高了成功破案和定罪的概率。但是，视频监控媒体 内容如何能够成为司法证据提供依据，视频监控录像真实性的视频水印技术就显 示出了重要作用。 本文旨在开发出一种新型抗几何攻击的视频水印系统，使其作为视频监控系 统功能的一部分，在视频监控录像的同时加入水印信号。之后无论视频录像经过 何种几何攻击的恶意破坏，其内嵌的水印仍然保持很好的完整性，正确检测提取 出来，以证明视频录像的真实与否。本文着重研究基于海森矩阵的三维缩放稳定 特征点提取，结合最小生成树、仿射协变区域归一化和反归一化算法，以及必威体育精装版 的DWT变换和量化索引机制，研发一种新型视频水印嵌入及提取系统，用于视频 监控录像的真伪鉴别。 实验结果表明，本文所提出的算法结合密钥技术，攻击者即使获知具体的算 法，仍无法对视频进行水印伪造，从而保障视频录像极高的安全性，基本达到了 设计要求。 关键词：视频 水印 主动防伪 最小生成树 归一化 ABSTRACT In the contemporary society, video surveillance system has been widely deployed in every field. It plays a critical role in preventing, frightening and striking crimes and becomes a significant composition in the modern all-in-one security administrative mechanism. During the law enforcement process of public security, video surveillance system performs as a rather efficient assistant case-solving tool, and dramatically raises the success ratio of both solving cases and convictions. However, facing the problem that how to make the video surveillance media contents contribute to judicial evidences, the importance of watermarking technology which works for the video authenticity emerges. This thesis is aiming at developing a new video watermarking system which has the ability to resist geometric attack, thereby making this new technology serves as one part of the video surveillance system functions, which means adding watermarking singles when the video is recording. No matter what malignant geometric attacks the video could suffere later on, the embedding water marks could still be examined and extracted correctly due