具备上下文依赖及鲁棒性的视频水印算法

数字水印技术可用于内容的鉴定及防止伪造，被看作是对已发布内容避免其受到未经授权的复用的重要技术。所有权信息以水印的方式嵌入至数字内容中，从而能够提供版权保护、所有权声明、数码内容完整性核查及其在遭受攻击时提供版权侵害的证据，因而水印技术成为构造数字媒体版权备选的方案。本文介绍了水印方法与有信编码与嵌入的关联性，设计了一个有效的方法，使用码字子集来代表预插入的0或1数据位。此外，还提出了一个码字生成方案，能控制码间距，从而保证了水印的鲁棒性与信号的保真度。通过比较测试可以看出，我们提出的方法在视频压缩方面具备出色的稳健性。

Robust Video Watermarking Algorithm with Correlative Context

Digital watermarking,a popular technique for content authentication and forgery prevention,is viewed as an enabling technology to protect distributed content from unauthorized reuse.Digital watermarks of ownership embedded onto digital content offer copyright protection,ownership assertion,integrity checks for digital content,and can pro- vide evidence of copyright infringement after an attack.Watermarking technologies have been envisioned as a potential means for establishing ownership on digital media objects.In this paper,a watermarking method that relies on in- formed coding and informed embedding is presented.We devise an efficient method,which uses a subset of various codewords to represent the 0 and 1 message bits to be embedded.We propose a codeword generation scheme that keeps control of the distance between codewords in order to secure fidelity and robustness of the watermark.When compared to existing video watermarking schemes,our method yields superior robustness to video compression.