一种子块相关的半脆弱数字水印

数字水印是多媒体数字产品版权保护和内容完整性认证的重要技术之一。为得到一种鲁棒性更好的数字水印,在分析MHB算法缺陷的基础上,采用认证码生成块与嵌入块及嵌入块之间互相关的策略,提出了一种更加安全的子块相关的半脆弱数字水印算法,并增强了算法抵抗恶意攻击的能力。实验结果表明,该算法在不破坏宿主图像视觉质量基础上,对JPEG有损压缩具有较强的鲁棒性,并可有效地检测出对图像内容的局部恶意篡改。

A Semi-fragile Watermarking with Blocks Relativity

Digital watermarking is a important technology of multimedia digital product's copyright protection and content authentication.Based on through analysis of the fragile watermark scheme presented by Marvel et al.,a novel safer semi-fragile image digital watermarking algorithm with blocks relativity is proposed in this paper.Simulation experiments show that it will not degrade the visual quality of original images,and maintain certain robustness for JPEG compression.Besides the scheme can be used to detect the counterfeiting attack to specific local content.