一种基于内容认证与恢复的半脆弱水印算法

A semi-fragile watermarking algorithm based on content authentication and recovery

针对传统奇偶量化存在的误检率较高的问题,提出了一种改进的基于量化的半脆弱水印算法。设计该算法时,将水印信息的生成与嵌入都放在原始的载体图像中完成;在认证图像时,也无需原始的载体图像和秘密水印的参与,这使得水印的安全性和保密性都得到了极大地提高。仿真实验结果表明:该算法有效地降低了误检率,且对恶意的篡改具有较强的敏感性和恢复能力,更适用于图像完整性和真实性认证。

Aiming at the high false-positive rate problem existing in traditional odd-even quantization method,a semi-fragile watermarking algorithm based on improved quantization is proposed. In the algorithm, watermarking generation and embedding are disposed in original image, and it needs no information about the original image or watermark during the process of image authentication, so that it increases the security and confidentiality of watermarking. The simulation shows the algorithm can reduce the false-positive rate effectively and has strong sensitivity and resilience to malicious tamper, so it is suitable for image integrity and authenticity.